CentOS7.9+Kubernetes1.28.3+Docker24.0.6高可用集群二进制部署
- 查看版本关系
## 从kubernetes-server-linux-amd64.tar.gz解压后有kubeadm
]# ./kubeadm config images list
W1022 20:06:05.647976 29233 version.go:104] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get "https://cdn.dl.k8s.io/release/stable-1.txt": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
W1022 20:06:05.648046 29233 version.go:105] falling back to the local client version: v1.28.3
registry.k8s.io/kube-apiserver:v1.28.3
registry.k8s.io/kube-controller-manager:v1.28.3
registry.k8s.io/kube-scheduler:v1.28.3
registry.k8s.io/kube-proxy:v1.28.3
registry.k8s.io/pause:3.9
registry.k8s.io/etcd:3.5.9-0
registry.k8s.io/coredns/coredns:v1.10.1
一、总体规划
1.1 软件获取
所有软件均为开源软件，源文件从官方链接或官方镜像链接地址获取。
1.1.1 centos 7.9
https://mirrors.tuna.tsinghua.edu.cn/centos/7.9.2009/isos/x86_64/
下载2009或2207其中任何一个版本都可以。
下载：https://mirrors.tuna.tsinghua.edu.cn/centos/7.9.2009/isos/x86_64/CentOS-7-x86_64-Minimal-2009.iso
下载：https://mirrors.tuna.tsinghua.edu.cn/centos/7.9.2009/isos/x86_64/CentOS-7-x86_64-Minimal-2207-02.iso
1.1.2 kubernetes v1.28.3
https://github.com/kubernetes/kubernetes/tree/v1.28.3
下载：https://dl.k8s.io/v1.28.3/kubernetes-server-linux-amd64.tar.gz
1.1.3 docker 24.0.6
https://download.docker.com/linux/static/stable/x86_64
下载：https://download.docker.com/linux/static/stable/x86_64/docker-24.0.6.tgz
1.1.4 cri-dockerd 0.3.5
https://github.com/Mirantis/cri-dockerd
下载：https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.5/cri-dockerd-0.3.5.amd64.tgz
1.1.5 etcd v3.5.9
https://github.com/etcd-io/etcd/
下载：https://github.com/etcd-io/etcd/releases/download/v3.5.9/etcd-v3.5.9-linux-amd64.tar.gz
1.1.6 cfssl v1.6.4
https://github.com/cloudflare/cfssl/releases
下载：https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssljson_1.6.4_linux_amd64
下载：https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssl_1.6.4_linux_amd64
下载：https://github.com/cloudflare/cfssl/releases/download/v1.6.4/cfssl-certinfo_1.6.4_linux_amd64
1.1.7 flannel v0.22.3
https://github.com/flannel-io/flannel
下载：https://github.com/flannel-io/flannel/releases/download/v0.22.3/flanneld-amd64
下载：https://github.com/flannel-io/flannel/releases/download/v0.22.3/flannel-v0.22.3-linux-amd64.tar.gz
1.1.8 cni-plugins v1.2.0、cni-plugin v1.2.0
下载：https://github.com/containernetworking/plugins/releases/download/v1.2.0/cni-plugins-linux-amd64-v1.2.0.tgz
下载：https://github.com/flannel-io/cni-plugin/releases/download/v1.2.0/cni-plugin-flannel-linux-amd64-v1.2.0.tgz
1.19 nginx 1.24.0
http://nginx.org/en/download.html
下载：http://nginx.org/download/nginx-1.24.0.tar.gz
1.2 集群主机规划
1.2.1 虚拟机安装及主机设置
- 主机名与hosts本地解析
| Hostname | Host IP | Host IP | Role |
|---|---|---|---|
| k8s1.28.3-1 | 192.168.26.51 | 10.26.51.1/24 | master&worker、etcd、docker、flannel |
| k8s1.28.3-2 | 192.168.26.52 | 10.26.52.1/24 | master&worker、etcd、docker、flannel |
| k8s1.28.3-3 | 192.168.26.53 | 10.26.53.1/24 | master&worker、etcd、docker、flannel |
[root@vm51 ~]# hostname ## 修改：# hostnamectl set-hostname k8s-51
k8s-51
src]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.26.51 k8s1.28.3-1 vm51 etcd_node1 k8s-51
192.168.26.52 k8s1.28.3-2 vm52 etcd_node2 k8s-52
192.168.26.53 k8s1.28.3-3 vm53 etcd_node3 k8s-53
- 关闭防火墙
~]# systemctl disable --now firewalld
Removed symlink /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
~]# firewall-cmd --state
not running
- 关闭SELINUX
~]# sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
~]# reboot
~]# sestatus
SELinux status: disabled
修改SELinux配置需要重启操作系统。
- 关闭交换分区
~]# sed -ri 's/.*swap.*/#&/' /etc/fstab
~]# swapoff -a && sysctl -w vm.swappiness=0
~]# cat /etc/fstab
#UUID=2ee3ecc4-e9e9-47c5-9afe-7b7b46fd6bab swap swap defaults 0 0
~]# free -m
total used free shared buff/cache available
Mem: 3770 171 3460 19 138 3402
Swap: 0 0 0
- 配置ulimit
~]# ulimit -SHn 65535
~]# cat << EOF >> /etc/security/limits.conf
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
EOF
1.2.2 ipvs管理工具安装及模块加载
获取离线安装rpm包，参考：附：安装ipvs工具
~]# yum install ipvsadm ipset sysstat conntrack libseccomp -y
...
~]# cat >> /etc/modules-load.d/ipvs.conf <<EOF
ip_vs
ip_vs_rr
ip_vs_wrr
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
EOF
~]# systemctl restart systemd-modules-load.service
~]# lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 12688 0
ip_vs_wrr 12697 0
ip_vs_rr 12600 4
ip_vs 145458 10 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack_ipv6 18935 3
nf_defrag_ipv6 35104 1 nf_conntrack_ipv6
nf_conntrack_netlink 40492 0
nf_conntrack_ipv4 19149 5
nf_defrag_ipv4 12729 1 nf_conntrack_ipv4
nf_conntrack 143360 10 ip_vs,nf_nat,nf_nat_ipv4,nf_nat_ipv6,xt_conntrack,nf_nat_masquerade_ipv4,nf_nat_masquerade_ipv6,nf_conntrack_netlink,nf_conntrack_ipv4,nf_conntrack_ipv6
libcrc32c 12644 4 xfs,ip_vs,nf_nat,nf_conntrack
1.2.3 加载containerd相关内核模块
临时加载模块
~]# modprobe overlay
~]# modprobe br_netfilter
永久性加载模块
~]# cat > /etc/modules-load.d/containerd.conf << EOF
overlay
br_netfilter
EOF
设置为开机启动
~]# systemctl restart systemd-modules-load.service ##systemctl enable --now systemd-modules-load.service
1.2.4 开启内核路由转发及网桥过滤
~]# cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 131072
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
~]# sysctl --system
所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
~]# reboot -h now
重启后查看ipvs模块加载情况：
~]# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
重启后查看containerd相关模块加载情况：
~]# lsmod | egrep 'br_netfilter | overlay'
1.2.5 主机时间同步
略
1.2.6 创建软件部署目录
- /opt/app 存放部署资源文件
- /opt/cfg 存放配置文件
- /opt/cert 存放证书
- /opt/bin 链接/opt/app下的源文件，去除文件名中的版本号，方便升级时只需要更改链接即可。
]# mkdir -p /opt/{app,cfg,cert,bin}
1.3 集群网络规划
| 网络名称 | 网段 | 备注 |
|---|---|---|
| Node网络 | 192.168.26.0/24 | Node IP，Node节点的IP地址，即物理机（宿主机）的网卡地址。 |
| Service网络 | 10.168.0.0/16 | Cluster IP，也可叫Service IP，Service的IP地址。service-cluster-ip-range定义Service IP地址范围的参数。 |
| Pod网络 | 10.26.0.0/16 | Pod IP，Pod的IP地址，容器（docker0）网桥分配的地址。cluster-cidr定义Pod网络CIDR地址范围的参数。 |
配置：
apiserver：
--service-cluster-ip-range 10.168.0.0/16 ##Service网络 10.168.0.0/16
controller：
--cluster-cidr 10.26.0.0/16 ##Pod网络 10.26.0.0/16
--service-cluster-ip-range 10.168.0.0/16 ##ervice网络 10.168.0.0/16
kubelet：
--cluster-dns 10.168.0.2 ## 解析Service，10.168.0.2
proxy：
--cluster-cidr 10.26.0.0/16 ##Pod网络 10.26.0.0/16
1.4 资源清单与镜像
| 类型 | 名称 | 下载链接 | 说明 |
|---|---|---|---|
| 资源 | coredns.yaml.base | https://github.com/kubernetes/kubernetes/blob/v1.27.6/cluster/addons/dns/coredns/coredns.yaml.base | 部署 |
| 资源 | recommended.yaml | https://github.com/kubernetes/dashboard/blob/v2.7.0/aio/deploy/recommended.yaml | 部署 |
| 资源 | components.yaml（metrics server） | https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.6.4/components.yaml | 部署 |
| 镜像 | metrics-server:v0.6.4 | registry.aliyuncs.com/google_containers/metrics-server:v0.6.4 | 部署 |
| 镜像 | coredns:v1.10.1 | registry.aliyuncs.com/google_containers/coredns:v1.10.1 | 部署 |
| 镜像 | dashboard:v2.7.0 | kubernetesui/dashboard:v2.7.0 | 部署 |
| 镜像 | metrics-scraper:v1.0.8 | kubernetesui/metrics-scraper:v1.0.8 | 部署 |
| 镜像 | pause:3.9 | registry.aliyuncs.com/google_containers/pause:3.9 | 部署 |
1.5 部署证书生成工具
app]# mv cfssl_1.6.4_linux_amd64 /usr/local/bin/cfssl
app]# mv cfssl-certinfo_1.6.4_linux_amd64 /usr/local/bin/cfssl-certinfo
app]# mv cfssljson_1.6.4_linux_amd64 /usr/local/bin/cfssljson
app]# chmod +x /usr/local/bin/cfssl*
app]# cfssl version
Version: 1.6.4
Runtime: go1.18
二、安装docker
2.1 解压、创建软连接、分发
~]# cd /opt/app/
app]# tar zxvf docker-24.0.6.tgz
app]# mv docker /opt/bin/docker-24.0.6
app]# ls /opt/bin/docker-24.0.6
containerd containerd-shim-runc-v2 ctr docker dockerd docker-init docker-proxy runc
app]# ln -s /opt/bin/docker-24.0.6/containerd /usr/bin/containerd
app]# ln -s /opt/bin/docker-24.0.6/containerd-shim-runc-v2 /usr/bin/containerd-shim-runc-v2
app]# ln -s /opt/bin/docker-24.0.6/ctr /usr/bin/ctr
app]# ln -s /opt/bin/docker-24.0.6/docker /usr/bin/docker
app]# ln -s /opt/bin/docker-24.0.6/dockerd /usr/bin/dockerd
app]# ln -s /opt/bin/docker-24.0.6/docker-init /usr/bin/docker-init
app]# ln -s /opt/bin/docker-24.0.6/docker-proxy /usr/bin/docker-proxy
app]# ln -s /opt/bin/docker-24.0.6/runc /usr/bin/runc
app]# docker -v
Docker version 24.0.6, build ed223bc
## 复制到k8s-51、k8s-52
app]# scp -r /opt/bin/docker-24.0.6/ root@k8s-51:/opt/bin/.
app]# scp -r /opt/bin/docker-24.0.6/ root@k8s-52:/opt/bin/.
## 在k8s-51、k8s-52创建软连接：同上
2.2 创建目录、配置文件
- 在3台主机上：
]# mkdir -p /data/docker /etc/docker
## k8s-51
]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.51.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
## k8s-52
]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.52.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
## k8s-53
]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.53.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
2.3 创建启动文件
]# cat /usr/lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service
Wants=network-online.target
[Service]
Type=notify
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TimeoutStartSec=0
Delegate=yes
KillMode=process
Restart=on-failure
StartLimitBurst=3
StartLimitInterval=60s
[Install]
WantedBy=multi-user.target
2.4 启动、检查
]# systemctl daemon-reload
]# systemctl start docker; systemctl enable docker
app]# docker info
Client:
Version: 24.0.6
Context: default
Debug Mode: false
Server:
Containers: 0
Running: 0
Paused: 0
Stopped: 0
Images: 0
Server Version: 24.0.6
Storage Driver: overlay2
Backing Filesystem: xfs
Supports d_type: true
Using metacopy: false
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: systemd
Cgroup Version: 1
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: io.containerd.runc.v2 runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 7880925980b188f4c97b462f709d0db8e8962aff
runc version: v1.1.9-0-gccaecfc
init version: de40ad0
Security Options:
seccomp
Profile: builtin
Kernel Version: 3.10.0-1160.90.1.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.682GiB
Name: k8s-53
ID: 8467715c-5b8b-4086-b703-4017ddf38e12
Docker Root Dir: /data/docker
Debug Mode: false
Experimental: false
Insecure Registries:
harbor.oss.com:32310
127.0.0.0/8
Registry Mirrors:
https://5gce61mx.mirror.aliyuncs.com/
Live Restore Enabled: true
Product License: Community Engine
app]# docker version
Client:
Version: 24.0.6
API version: 1.43
Go version: go1.20.7
Git commit: ed223bc
Built: Mon Sep 4 12:30:51 2023
OS/Arch: linux/amd64
Context: default
Server: Docker Engine - Community
Engine:
Version: 24.0.6
API version: 1.43 (minimum version 1.12)
Go version: go1.20.7
Git commit: 1a79695
Built: Mon Sep 4 12:32:17 2023
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.7.3
GitCommit: 7880925980b188f4c97b462f709d0db8e8962aff
runc:
Version: 1.1.9
GitCommit: v1.1.9-0-gccaecfc
docker-init:
Version: 0.19.0
GitCommit: de40ad0
app]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:c6:99:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.26.51/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fec6:995e/64 scope link
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:43:aa:de:72 brd ff:ff:ff:ff:ff:ff
inet 10.26.51.1/24 brd 10.26.51.255 scope global docker0
valid_lft forever preferred_lft forever
2.5 拉取镜像
在k8s-53：
k8s-53 app]# docker pull centos
...
app]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
centos latest 5d0da3dc9764 2 years ago 231MB
k8s-53 app]# docker run -i -t --name test centos /bin/bash
[root@e179e0701ccc /]# ip a
[root@3add8e00e63b /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
4: eth0@if5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:0a:1a:35:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.26.53.2/24 brd 10.26.53.255 scope global eth0
valid_lft forever preferred_lft forever
k8s-53 app]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3add8e00e63b centos "/bin/bash" 47 seconds ago Exited (127) 4 seconds ago test
k8s-53 app]# docker rm test
三、安装cri-dockerd
为什么要安装cri-dockerd插件？
-
K8s在刚开源时没有自己的容器引擎，而当时docker非常火爆是容器的代表，所以就在kubelet的代码里集成了对接docker的代码——docker shim，所以1.24版本之前是默认使用docker，不需要安装cri-dockerd。
-
K8s 1.24版本移除 docker-shim的代码，而 Docker Engine 默认又不支持CRI标准，因此二者默认无法再直接集成。为此，Mirantis 和 Docker 为了Docker Engine 提供一个能够支持到CRI规范的桥梁，就联合创建了cri-dockerd，从而能够让 Docker 作为K8s 容器引擎。
-
截至目前2023年10月20日，k8s已经更新至1.28.3版。从v1.24起，Docker不能直接作为k8s的容器运行时，因为在k8s v1.24版本移除了叫dockershim的组件，这是由k8s团队直接维护而非Docker团队维护的组件，这意味着Docker和k8s的关系不再像原来那般亲密，开发者需要使用其它符合CRI（容器运行时接口）的容器运行时工具（如containerd, CRI-O等），当然这并不意味着新版本的k8s彻底抛弃Docker（由于Docker庞大的生态和广泛的群众基础，显然这并不容易办到），在原本安装了Docker的基础上，可以通过补充安装cri-dockerd，以满足容器运行时接口的条件，从某种程度上说，cri-dockerd就是翻版的dockershim。
3.1 解压、创建软链接、分发
k8s-53 app]# tar -zxvf cri-dockerd-0.3.5.amd64.tgz
k8s-53 app]# mv cri-dockerd /opt/bin/cri-dockerd-0.3.5
k8s-53 app]# ll /opt/bin/cri-dockerd-0.3.5
总用量 41568
-rwxrwxr-x 1 1000 1000 42565632 10月 17 05:49 cri-dockerd
k8s-53 app]# ln -s /opt/bin/cri-dockerd-0.3.5/cri-dockerd /usr/local/bin/cri-dockerd
k8s-53 app]# cri-dockerd --version
cri-dockerd 0.3.5 (cd730ff8)
复制：
k8s-53 app]# scp -r /opt/bin/cri-dockerd-0.3.5 root@k8s-51:/opt/bin/.
k8s-53 app]# scp -r /opt/bin/cri-dockerd-0.3.5 root@k8s-52:/opt/bin/.
创建软链接：同上
3.2 修改配置文件、启动
]# cat /usr/lib/systemd/system/cri-dockerd.service
[Unit]
Description=CRI Interface for Docker Application Container Engine
Documentation=https://docs.mirantis.com
After=network-online.target firewalld.service docker.service
Wants=network-online.target
Requires=cri-docker.socket ## 如果启动报错，则注释掉这一行
[Service]
Type=notify
ExecStart=/usr/bin/cri-dockerd --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.9
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
# Note that StartLimit* options were moved from "Service" to "Unit" in systemd 229.
# Both the old, and new location are accepted by systemd 229 and up, so using the old location
# to make them work for either version of systemd.
StartLimitBurst=3
# Note that StartLimitInterval was renamed to StartLimitIntervalSec in systemd 230.
# Both the old, and new name are accepted by systemd 230 and up, so using the old name to make
# this option work for either version of systemd.
StartLimitInterval=60s
# Having non-zero Limit*s causes performance problems due to accounting overhead
# in the kernel. We recommend using cgroups to do container-local accounting.
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
# Comment TasksMax if your systemd version does not support it.
# Only systemd 226 and above support this option.
TasksMax=infinity
Delegate=yes
KillMode=process
[Install]
WantedBy=multi-user.target
]# systemctl daemon-reload
]# systemctl enable cri-dockerd && systemctl start cri-dockerd
]# systemctl status cri-dockerd
● cri-dockerd.service - CRI Interface for Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/cri-dockerd.service; disabled; vendor preset: disabled)
Active: active (running) since 五 2023-10-20 16:11:13 CST; 7s ago
...
四、创建证书
在k8s-53上/opt/cert目录下创建，然后分发。
4.1 创建CA根证书
- ca-csr.json
cert]# cat > ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
cert]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
cert]# ls ca*pem
ca-key.pem ca.pem
- ca-config.json
cat > ca-config.json << EOF
{
"signing": {
"default": {
"expiry": "876000h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "876000h"
}
}
}
}
EOF
4.2 创建etcd证书
- etcd-ca-csr.json
cat > etcd-ca-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
],
"ca": {
"expiry": "876000h"
}
}
EOF
- etcd-csr.json
cat > etcd-csr.json << EOF
{
"CN": "etcd",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "etcd",
"OU": "Etcd Security"
}
]
}
EOF
cert]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare etcd-ca
cert]# ls etcd-ca*pem
etcd-ca-key.pem etcd-ca.pem
cert]# cfssl gencert \
-ca=./etcd-ca.pem \
-ca-key=./etcd-ca-key.pem \
-config=./ca-config.json \
-hostname=127.0.0.1,k8s-51,k8s-52,k8s-53,192.168.26.51,192.168.26.52,192.168.26.53 \
-profile=kubernetes \
etcd-csr.json | cfssljson -bare ./etcd
cert]# ls etcd*pem
etcd-ca-key.pem etcd-ca.pem etcd-key.pem etcd.pem
4.3 创建kube-apiserver证书
- apiserver-csr.json
cat > apiserver-csr.json << EOF
{
"CN": "kube-apiserver",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "Kubernetes",
"OU": "Kubernetes-manual"
}
]
}
EOF
cert]# cfssl gencert \
-ca=./ca.pem \
-ca-key=./ca-key.pem \
-config=./ca-config.json \
-hostname=127.0.0.1,k8s-51,k8s-52,k8s-53,192.168.26.51,192.168.26.52,192.168.26.53,10.168.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local \
-profile=kubernetes apiserver-csr.json | cfssljson -bare ./apiserver
cert]# ls apiserver*pem
apiserver-key.pem apiserver.pem
- front-proxy-ca-csr.json
cat > front-proxy-ca-csr.json << EOF
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"ca": {
"expiry": "876000h"
}
}
EOF
- front-proxy-client-csr.json
cat > front-proxy-client-csr.json << EOF
{
"CN": "front-proxy-client",
"key": {
"algo": "rsa",
"size": 2048
}
}
EOF
## 生成kube-apiserver聚合证书
cert]# cfssl gencert -initca front-proxy-ca-csr.json | cfssljson -bare ./front-proxy-ca
cert]# ls front-proxy-ca*pem
front-proxy-ca-key.pem front-proxy-ca.pem
cert]# cfssl gencert \
-ca=./front-proxy-ca.pem \
-ca-key=./front-proxy-ca-key.pem \
-config=./ca-config.json \
-profile=kubernetes front-proxy-client-csr.json | cfssljson -bare ./front-proxy-client
cert]# ls front-proxy-client*pem
front-proxy-client-key.pem front-proxy-client.pem
4.4 创建kube-controller-manager的证书
- manager-csr.json，用于生成配置文件controller-manager.kubeconfig
cat > manager-csr.json << EOF
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "Kubernetes-manual"
}
]
}
EOF
cert]# cfssl gencert \
-ca=./ca.pem \
-ca-key=./ca-key.pem \
-config=./ca-config.json \
-profile=kubernetes \
manager-csr.json | cfssljson -bare ./controller-manager
cert]# ls controller-manager*pem
controller-manager-key.pem controller-manager.pem
- admin-csr.json，用于生成配置文件admin.kubeconfig
cat > admin-csr.json << EOF
{
"CN": "admin",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "Kubernetes-manual"
}
]
}
EOF
cert]# cfssl gencert \
-ca=./ca.pem \
-ca-key=./ca-key.pem \
-config=./ca-config.json \
-profile=kubernetes \
admin-csr.json | cfssljson -bare ./admin
cert]# ls admin*pem
admin-key.pem admin.pem
4.5 创建kube-schedule证书
- scheduler-csr.json，用于生成配置文件scheduler.kubeconfig
cat > scheduler-csr.json << EOF
{
"CN": "system:kube-scheduler",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "Kubernetes-manual"
}
]
}
EOF
cert]# cfssl gencert \
-ca=./ca.pem \
-ca-key=./ca-key.pem \
-config=./ca-config.json \
-profile=kubernetes \
scheduler-csr.json | cfssljson -bare ./scheduler
cert]# ls scheduler*pem
scheduler-key.pem scheduler.pem
4.6 创建kube-prox证书
- kube-proxy-csr.json，用于生成配置文件kube-proxy.kubeconfig
cat > kube-proxy-csr.json << EOF
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-proxy",
"OU": "Kubernetes-manual"
}
]
}
EOF
cert]# cfssl gencert \
-ca=./ca.pem \
-ca-key=./ca-key.pem \
-config=./ca-config.json \
-profile=kubernetes \
kube-proxy-csr.json | cfssljson -bare ./kube-proxy
cert]# ls kube-proxy*pem
kube-proxy-key.pem kube-proxy.pem
4.7 创建ServiceAccount Key - secret
cert]# openssl genrsa -out /opt/cert/sa.key 2048
cert]# openssl rsa -in /opt/cert/sa.key -pubout -out /opt/cert/sa.pub
cert]# ls /opt/cert/sa*
/opt/cert/sa.key /opt/cert/sa.pub
4.8 分发证书到各节点
cert]# scp /opt/cert/* root@k8s-51:/opt/cert/.
cert]# scp /opt/cert/* root@k8s-52:/opt/cert/.
五、部署etcd
5.1 准备etcd二进制软件
## 解压软件包，并将运行软件放到/opt/bin目录
k8s-53 app]# tar -xf etcd-v3.5.9-linux-amd64.tar.gz -C /opt/bin
k8s-53 app]# ls /opt/bin/etcd-v3.5.9-linux-amd64/ -l
总用量 52408
drwxr-xr-x 3 528287 89939 40 5月 11 19:40 Documentation
-rwxr-xr-x 1 528287 89939 22474752 5月 11 19:40 etcd
-rwxr-xr-x 1 528287 89939 16998400 5月 11 19:40 etcdctl
-rwxr-xr-x 1 528287 89939 14118912 5月 11 19:40 etcdutl
-rw-r--r-- 1 528287 89939 42066 5月 11 19:40 README-etcdctl.md
-rw-r--r-- 1 528287 89939 7359 5月 11 19:40 README-etcdutl.md
-rw-r--r-- 1 528287 89939 9394 5月 11 19:40 README.md
-rw-r--r-- 1 528287 89939 7896 5月 11 19:40 READMEv2-etcdctl.md
k8s-53 app]# ln -s /opt/bin/etcd-v3.5.9-linux-amd64/etcdctl /usr/local/bin/etcdctl
k8s-53 app]# ln -s /opt/bin/etcd-v3.5.9-linux-amd64/etcd /opt/bin/etcd
k8s-53 app]# etcdctl version
etcdctl version: 3.5.
## 复制软件到其他节点
]# scp -r /opt/bin/etcd-v3.5.9-linux-amd64/ root@k8s-51:/opt/bin/
]# scp -r /opt/bin/etcd-v3.5.9-linux-amd64/ root@k8s-52:/opt/bin/
## 在其他节点创建软链接
]# ln -s /opt/bin/etcd-v3.5.9-linux-amd64/etcdctl /usr/local/bin/etcdctl
]# ln -s /opt/bin/etcd-v3.5.9-linux-amd64/etcd /opt/bin/etcd
5.2 启动参数配置文件
- k8s-51：/opt/cfg/etcd.config.yml
cat > /opt/cfg/etcd.config.yml << EOF
name: 'k8s-51'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.26.51:2380'
listen-client-urls: 'https://192.168.26.51:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.26.51:2380'
advertise-client-urls: 'https://192.168.26.51:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-51=https://192.168.26.51:2380,k8s-52=https://192.168.26.52:2380,k8s-53=https://192.168.26.53:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
etcd启动参数配置文件没有enable-v2: true时，etcd默认为v3，命令行中可以不加ETCDCTL_API=3
- k8s-52：/opt/cfg/etcd.config.yml
cat > /opt/cfg/etcd.config.yml << EOF
name: 'k8s-52'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.26.52:2380'
listen-client-urls: 'https://192.168.26.52:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.26.52:2380'
advertise-client-urls: 'https://192.168.26.52:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-51=https://192.168.26.51:2380,k8s-52=https://192.168.26.52:2380,k8s-53=https://192.168.26.53:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
- k8s-53：/opt/cfg/etcd.config.yml
cat > /opt/cfg/etcd.config.yml << EOF
name: 'k8s-53'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://192.168.26.53:2380'
listen-client-urls: 'https://192.168.26.53:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://192.168.26.53:2380'
advertise-client-urls: 'https://192.168.26.53:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-51=https://192.168.26.51:2380,k8s-52=https://192.168.26.52:2380,k8s-53=https://192.168.26.53:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
peer-transport-security:
cert-file: '/opt/cert/etcd.pem'
key-file: '/opt/cert/etcd-key.pem'
peer-client-cert-auth: true
trusted-ca-file: '/opt/cert/etcd-ca.pem'
auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false
EOF
5.3 创建service、启动、检查
在edcd节点k8s-51、k8s-52、k8s-53
cat > /usr/lib/systemd/system/etcd.service << EOF
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target
[Service]
Type=notify
ExecStart=/opt/bin/etcd --config-file=/opt/cfg/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
Alias=etcd3.service
EOF
启动，检查
]# systemctl daemon-reload
]# systemctl enable --now etcd
]# systemctl status etcd
● etcd.service - Etcd Service
Loaded: loaded (/usr/lib/systemd/system/etcd.service; enabled; vendor preset: disabled)
Active: active (running) since 六 2023-10-21 07:59:54 CST; 24s ago
Docs: https://coreos.com/etcd/docs/latest/
Main PID: 1564 (etcd)
Tasks: 8
Memory: 26.4M
CGroup: /system.slice/etcd.service
└─1564 /opt/bin/etcd --config-file=/opt/cfg/etcd.config.yml
...
## 默认：ETCDCTL_API=3
]# etcdctl --endpoints="192.168.26.51:2379,192.168.26.52:2379,192.168.26.53:2379" \
--cacert=/opt/cert/etcd-ca.pem --cert=/opt/cert/etcd.pem --key=/opt/cert/etcd-key.pem endpoint health --write-out=table
+--------------------+--------+-------------+-------+
| 192.168.26.51:2379 | true | 10.751752ms | |
| 192.168.26.53:2379 | true | 11.157143ms | |
| 192.168.26.52:2379 | true | 29.083563ms | |
+--------------------+--------+-------------+-------+
]# etcdctl --endpoints="192.168.26.51:2379,192.168.26.52:2379,192.168.26.53:2379" \
--cacert=/opt/cert/etcd-ca.pem --cert=/opt/cert/etcd.pem --key=/opt/cert/etcd-key.pem endpoint status --write-out=table
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| ENDPOINT | ID | VERSION | DB SIZE | IS LEADER | IS LEARNER | RAFT TERM | RAFT INDEX | RAFT APPLIED INDEX | ERRORS |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
| 192.168.26.51:2379 | f0355985a6ae32e9 | 3.5.9 | 29 kB | true | false | 2 | 11 | 11 | |
| 192.168.26.52:2379 | 675c2a43b7236ee3 | 3.5.9 | 20 kB | false | false | 2 | 11 | 11 | |
| 192.168.26.53:2379 | 1bd9fbe011426d48 | 3.5.9 | 20 kB | false | false | 2 | 11 | 11 | |
+--------------------+------------------+---------+---------+-----------+------------+-----------+------------+--------------------+--------+
]# etcdctl --endpoints="192.168.26.51:2379,192.168.26.52:2379,192.168.26.53:2379" \
--cacert=/opt/cert/etcd-ca.pem --cert=/opt/cert/etcd.pem --key=/opt/cert/etcd-key.pem member list --write-out=table
+------------------+---------+--------+----------------------------+----------------------------+------------+
| ID | STATUS | NAME | PEER ADDRS | CLIENT ADDRS | IS LEARNER |
+------------------+---------+--------+----------------------------+----------------------------+------------+
| 1bd9fbe011426d48 | started | k8s-53 | https://192.168.26.53:2380 | https://192.168.26.53:2379 | false |
| 675c2a43b7236ee3 | started | k8s-52 | https://192.168.26.52:2380 | https://192.168.26.52:2379 | false |
| f0355985a6ae32e9 | started | k8s-51 | https://192.168.26.51:2380 | https://192.168.26.51:2379 | false |
+------------------+---------+--------+----------------------------+----------------------------+------------+
六、部署flannel
官方参考：
- https://github.com/flannel-io/flannel/blob/v0.22.3/Documentation/configuration.md
- https://github.com/flannel-io/flannel/blob/v0.22.3/Documentation/running.md
6.1、确认etcd正常
参见etcd部分。
6.2、查看当前路由
k8s-51:
]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.51.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
k8s-52:
]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.52.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
k8s-53:
]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.53.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
清除其它路由，如：route del -net 10.26.57.0 netmask 255.255.255.0 gw 192.168.26.53
6.3、添加flannel网络信息到etcd
- 在任一etcd节点进行操作
~]# etcdctl --endpoints="192.168.26.51:2379,192.168.26.52:2379,192.168.26.53:2379" \
--cacert=/opt/cert/etcd-ca.pem --cert=/opt/cert/etcd.pem --key=/opt/cert/etcd-key.pem \
put /coreos.com/network/config '{"Network": "10.26.0.0/16", "Backend": {"Type": "vxlan"}}'
- 查看
~]# etcdctl --endpoints="192.168.26.51:2379,192.168.26.52:2379,192.168.26.53:2379" \
--cacert=/opt/cert/etcd-ca.pem --cert=/opt/cert/etcd.pem --key=/opt/cert/etcd-key.pem get /coreos.com/network/config
/coreos.com/network/config
{"Network": "10.26.0.0/16", "Backend": {"Type": "vxlan"}}
6.4、flannel解压、创建软连接
k8s-53：
]# cd /opt/app
k8s-53 app]# mkdir /opt/bin/flannel-v0.22.3-linux-amd64
k8s-53 app]# tar zxvf flannel-v0.22.3-linux-amd64.tar.gz -C /opt/bin/flannel-v0.22.3-linux-amd64
flanneld
mk-docker-opts.sh
README.md
k8s-53 app]# scp -r /opt/bin/flannel-v0.22.3-linux-amd64 root@k8s-51:/opt/bin/.
k8s-53 app]# scp -r /opt/bin/flannel-v0.22.3-linux-amd64 root@k8s-52:/opt/bin/.
## 创建软连接
]# ln -s /opt/bin/flannel-v0.22.3-linux-amd64/flanneld /opt/bin/flanneld
6.5、添加配置文件
k8s-51：--public-ip=192.168.26.51；k8s-52：--public-ip=192.168.26.52；k8s-53：--public-ip=192.168.26.53
cat > /opt/cfg/kube-flanneld.conf << EOF
KUBE_FLANNELD_OPTS="--public-ip=192.168.26.51 \\
--etcd-endpoints=https://192.168.26.51:2379,https://192.168.26.52:2379,https://192.168.26.53:2379 \\
--etcd-keyfile=/opt/cert/etcd-key.pem \\
--etcd-certfile=/opt/cert/etcd.pem \\
--etcd-cafile=/opt/cert/etcd-ca.pem \\
--kube-subnet-mgr=false \\
--iface=ens32 \\
--iptables-resync=5 \\
--subnet-file=/run/flannel/subnet.env \\
--healthz-port=2401"
EOF
6.6、添加启动文件
cat > /usr/lib/systemd/system/kube-flanneld.service << EOF
[Unit]
Description=Kubernetes flanneld
Documentation=https://github.com/coreos/flannel
After=network.target
Before=docker.service
[Service]
EnvironmentFile=/opt/cfg/kube-flanneld.conf
## ExecStartPost=/usr/bin/mk-docker-opts.sh 这一行注释掉
ExecStart=/opt/bin/flanneld \$KUBE_FLANNELD_OPTS
Restart=on-failure
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
6.7、启动、检查
]# systemctl daemon-reload && systemctl start kube-flanneld && systemctl enable kube-flanneld
]# systemctl status kube-flanneld
● kube-flanneld.service - Kubernetes flanneld
Loaded: loaded (/usr/lib/systemd/system/kube-flanneld.service; disabled; vendor preset: disabled)
Active: active (running) since 六 2023-10-21 08:44:01 CST; 19s ago
...
查看生成的/run/flannel/subnet.env
]# cat /run/flannel/subnet.env
FLANNEL_NETWORK=10.26.0.0/16
FLANNEL_SUBNET=10.26.25.1/24
FLANNEL_MTU=1450
FLANNEL_IPMASQ=false
k8s-51 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:c6:99:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.26.51/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fec6:995e/64 scope link
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:9b:c4:eb:d4 brd ff:ff:ff:ff:ff:ff
inet 10.26.51.1/24 brd 10.26.51.255 scope global docker0
valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether d6:f5:01:c5:16:88 brd ff:ff:ff:ff:ff:ff
inet 10.26.6.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::d4f5:1ff:fec5:1688/64 scope link
valid_lft forever preferred_lft forever
k8s-52 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:0d:04:bf brd ff:ff:ff:ff:ff:ff
inet 192.168.26.52/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe0d:4bf/64 scope link
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:17:74:7a:4f brd ff:ff:ff:ff:ff:ff
inet 10.26.52.1/24 brd 10.26.52.255 scope global docker0
valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether 2a:86:94:58:85:c4 brd ff:ff:ff:ff:ff:ff
inet 10.26.75.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::2886:94ff:fe58:85c4/64 scope link
valid_lft forever preferred_lft forever
k8s-53 app]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:24:1d:cf brd ff:ff:ff:ff:ff:ff
inet 192.168.26.53/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe24:1dcf/64 scope link
valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:82:02:5d:d5 brd ff:ff:ff:ff:ff:ff
inet 10.26.53.1/24 brd 10.26.53.255 scope global docker0
valid_lft forever preferred_lft forever
4: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether 36:96:d4:5a:3a:71 brd ff:ff:ff:ff:ff:ff
inet 10.26.25.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::3496:d4ff:fe5a:3a71/64 scope link
valid_lft forever preferred_lft forever
- k8s-51
k8s-51 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.25.0 10.26.25.0 255.255.255.0 UG 0 0 0 flannel.1
10.26.51.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
10.26.75.0 10.26.75.0 255.255.255.0 UG 0 0 0 flannel.1
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
- k8s-52
k8s-52 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.6.0 10.26.6.0 255.255.255.0 UG 0 0 0 flannel.1
10.26.25.0 10.26.25.0 255.255.255.0 UG 0 0 0 flannel.1
10.26.52.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
- k8s-53
k8s-53 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.6.0 10.26.6.0 255.255.255.0 UG 0 0 0 flannel.1
10.26.53.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
10.26.75.0 10.26.75.0 255.255.255.0 UG 0 0 0 flannel.1
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
6.8、和docker集成
修改/etc/docker/daemon.json，重启docker
k8s-53 ~]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.25.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
k8s-53 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:24:1d:cf brd ff:ff:ff:ff:ff:ff
inet 192.168.26.53/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe24:1dcf/64 scope link
valid_lft forever preferred_lft forever
3: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether 76:3e:f4:2d:6a:59 brd ff:ff:ff:ff:ff:ff
inet 10.26.25.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::743e:f4ff:fe2d:6a59/64 scope link
valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:a3:cb:ee:74 brd ff:ff:ff:ff:ff:ff
inet 10.26.25.1/24 brd 10.26.25.255 scope global docker0
valid_lft forever preferred_lft forever
k8s-52 ~]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.75.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
k8s-52 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:0d:04:bf brd ff:ff:ff:ff:ff:ff
inet 192.168.26.52/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fe0d:4bf/64 scope link
valid_lft forever preferred_lft forever
3: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether 02:e3:00:4d:cd:33 brd ff:ff:ff:ff:ff:ff
inet 10.26.75.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::e3:ff:fe4d:cd33/64 scope link
valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:6d:94:06:92 brd ff:ff:ff:ff:ff:ff
inet 10.26.75.1/24 brd 10.26.75.255 scope global docker0
valid_lft forever preferred_lft forever
k8s-51 ~]# cat /etc/docker/daemon.json
{
"data-root": "/data/docker",
"storage-driver": "overlay2",
"insecure-registries": ["harbor.oss.com:32310"],
"registry-mirrors": ["https://5gce61mx.mirror.aliyuncs.com"],
"bip": "10.26.6.1/24",
"exec-opts": ["native.cgroupdriver=systemd"],
"live-restore": true
}
k8s-51 ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens32: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:c6:99:5e brd ff:ff:ff:ff:ff:ff
inet 192.168.26.51/24 brd 192.168.26.255 scope global noprefixroute ens32
valid_lft forever preferred_lft forever
inet6 fe80::20c:29ff:fec6:995e/64 scope link
valid_lft forever preferred_lft forever
3: flannel.1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1450 qdisc noqueue state UNKNOWN group default
link/ether 2e:2b:9b:b9:83:3d brd ff:ff:ff:ff:ff:ff
inet 10.26.6.0/32 scope global flannel.1
valid_lft forever preferred_lft forever
inet6 fe80::2c2b:9bff:feb9:833d/64 scope link
valid_lft forever preferred_lft forever
4: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
link/ether 02:42:e3:ae:92:cf brd ff:ff:ff:ff:ff:ff
inet 10.26.6.1/24 brd 10.26.6.255 scope global docker0
valid_lft forever preferred_lft forever
6.9 测试验证容器互访、容器与主机互访
在k8s-51、k8s-52、k8s-53启动容器：
51 ~]# docker run -i -t --name node51 centos /bin/bash
[root@5b05cd016a5f /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
5: eth0@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:0a:1a:06:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.26.6.2/24 brd 10.26.6.255 scope global eth0
valid_lft forever preferred_lft forever
52 ~]# docker run -i -t --name node52 centos /bin/bash
[root@41f15af3fdaf /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
5: eth0@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:0a:1a:4b:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.26.75.2/24 brd 10.26.75.255 scope global eth0
valid_lft forever preferred_lft forever
53 ~]# docker run -i -t --name node53 centos /bin/bash
[root@890f2c8150dc /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
5: eth0@if6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether 02:42:0a:1a:19:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 10.26.25.2/24 brd 10.26.25.255 scope global eth0
valid_lft forever preferred_lft forever
6.9.1 跨主机之间的容器访问（容器 > 容器）：从k8s-51容器访问另一主机上的容器
## ping k8s-52上的容器10.26.75.2
[root@5b05cd016a5f /]# ping 10.26.75.2 -c 3
PING 10.26.75.2 (10.26.75.2) 56(84) bytes of data.
64 bytes from 10.26.75.2: icmp_seq=1 ttl=62 time=0.452 ms
64 bytes from 10.26.75.2: icmp_seq=2 ttl=62 time=0.540 ms
64 bytes from 10.26.75.2: icmp_seq=3 ttl=62 time=0.513 ms
--- 10.26.75.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.452/0.501/0.540/0.044 ms
## ping k8s-53上的容器10.26.25.2
[root@5b05cd016a5f /]# ping 10.26.25.2 -c 3
PING 10.26.25.2 (10.26.25.2) 56(84) bytes of data.
64 bytes from 10.26.25.2: icmp_seq=1 ttl=62 time=0.497 ms
64 bytes from 10.26.25.2: icmp_seq=2 ttl=62 time=0.518 ms
64 bytes from 10.26.25.2: icmp_seq=3 ttl=62 time=0.528 ms
--- 10.26.25.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.497/0.514/0.528/0.022 ms
6.9.2 跨容器主机之间的访问（容器 > 主机）：从k8s-51容器访问所有主机
[root@5b05cd016a5f /]# ping 192.168.26.52 -c 3
PING 192.168.26.52 (192.168.26.52) 56(84) bytes of data.
64 bytes from 192.168.26.52: icmp_seq=1 ttl=63 time=0.377 ms
64 bytes from 192.168.26.52: icmp_seq=2 ttl=63 time=0.482 ms
64 bytes from 192.168.26.52: icmp_seq=3 ttl=63 time=0.482 ms
--- 192.168.26.52 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.377/0.447/0.482/0.049 ms
[root@5b05cd016a5f /]# ping 192.168.26.53 -c 3
PING 192.168.26.53 (192.168.26.53) 56(84) bytes of data.
64 bytes from 192.168.26.53: icmp_seq=1 ttl=63 time=0.308 ms
64 bytes from 192.168.26.53: icmp_seq=2 ttl=63 time=0.540 ms
64 bytes from 192.168.26.53: icmp_seq=3 ttl=63 time=0.533 ms
--- 192.168.26.53 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.308/0.460/0.540/0.109 ms
6.9.3 跨主机容器之间的访问（主机 > 容器）：从k8s-51主机访问所有主机上的容器
k8s-51 ~]# ping 10.26.6.2 -c 3
PING 10.26.6.2 (10.26.6.2) 56(84) bytes of data.
64 bytes from 10.26.6.2: icmp_seq=1 ttl=64 time=0.036 ms
64 bytes from 10.26.6.2: icmp_seq=2 ttl=64 time=0.044 ms
64 bytes from 10.26.6.2: icmp_seq=3 ttl=64 time=0.041 ms
--- 10.26.6.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 1999ms
rtt min/avg/max/mdev = 0.036/0.040/0.044/0.006 ms
k8s-51 ~]# ping 10.26.75.2 -c 3
PING 10.26.75.2 (10.26.75.2) 56(84) bytes of data.
64 bytes from 10.26.75.2: icmp_seq=1 ttl=63 time=0.429 ms
64 bytes from 10.26.75.2: icmp_seq=2 ttl=63 time=0.535 ms
64 bytes from 10.26.75.2: icmp_seq=3 ttl=63 time=0.558 ms
--- 10.26.75.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.429/0.507/0.558/0.059 ms
k8s-51 ~]# ping 10.26.25.2 -c 3
PING 10.26.25.2 (10.26.25.2) 56(84) bytes of data.
64 bytes from 10.26.25.2: icmp_seq=1 ttl=63 time=0.463 ms
64 bytes from 10.26.25.2: icmp_seq=2 ttl=63 time=0.477 ms
64 bytes from 10.26.25.2: icmp_seq=3 ttl=63 time=0.499 ms
--- 10.26.25.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2000ms
rtt min/avg/max/mdev = 0.463/0.479/0.499/0.029 ms
6.9.4 从容器访问百度(具备外网访问时测试)
[root@5b05cd016a5f /]# ping www.baidu.com -c 3
PING www.baidu.com (14.119.104.254) 56(84) bytes of data.
64 bytes from www.baidu.com (14.119.104.254): icmp_seq=1 ttl=127 time=10.5 ms
64 bytes from www.baidu.com (14.119.104.254): icmp_seq=2 ttl=127 time=9.96 ms
64 bytes from www.baidu.com (14.119.104.254): icmp_seq=3 ttl=127 time=15.2 ms
--- www.baidu.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 9.964/11.893/15.195/2.348 ms
6.9.5 k8s-52、k8s-53上的测试
步骤同上。
七、k8s核心组件
7.1 准备
## 解压软件包，并将运行软件放到/opt/bin目录
app]# tar -xf kubernetes-server-linux-amd64.tar.gz --strip-components=3 -C /opt/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}
]# ls -l /opt/bin/kube*
-rwxr-xr-x 1 root root 121683968 10月 18 20:02 /opt/bin/kube-apiserver
-rwxr-xr-x 1 root root 117706752 10月 18 20:02 /opt/bin/kube-controller-manager
-rwxr-xr-x 1 root root 49872896 10月 18 20:02 /opt/bin/kubectl
-rwxr-xr-x 1 root root 110780416 10月 18 20:02 /opt/bin/kubelet
-rwxr-xr-x 1 root root 55050240 10月 18 20:02 /opt/bin/kube-proxy
-rwxr-xr-x 1 root root 56016896 10月 18 20:02 /opt/bin/kube-scheduler
]# ln -s /opt/bin/kubectl /usr/local/bin/kubectl
]# /opt/bin/kubelet --version
Kubernetes v1.28.3
## 复制软件到其他节点，并创建软链接
]# scp /opt/bin/kube* root@k8s-51:/opt/bin/
]# scp /opt/bin/kube* root@k8s-52:/opt/bin/
]# ln -s /opt/bin/kubectl /usr/local/bin/kubectl
7.2 Nginx高可用方案
使用 nginx方案，kube-apiserver中的配置为： --server=https://127.0.0.1:8443
- 编译安装nginx
## 在一台有开发环境的主机上进行编译安装，然后复制到集群节点
app]# tar xvf nginx-1.24.0.tar.gz
app]# cd nginx-1.24.0
nginx-1.24.0]# ./configure --with-stream --without-http --without-http_uwsgi_module --without-http_scgi_module --without-http_fastcgi_module
nginx-1.24.0]# make && make install
nginx-1.24.0]# ls -l /usr/local/nginx
drwxr-xr-x 2 root root 333 7月 3 10:55 conf
drwxr-xr-x 2 root root 40 7月 3 10:55 html
drwxr-xr-x 2 root root 6 7月 3 10:55 logs
drwxr-xr-x 2 root root 19 7月 3 10:55 sbin
- nginx配置文件/usr/local/nginx/conf/kube-nginx.con
# 写入nginx配置文件
cat > /usr/local/nginx/conf/kube-nginx.conf <<EOF
worker_processes 1;
events {
worker_connections 1024;
}
stream {
upstream backend {
least_conn;
hash $remote_addr consistent;
server 192.168.26.51:6443 max_fails=3 fail_timeout=30s;
server 192.168.26.52:6443 max_fails=3 fail_timeout=30s;
server 192.168.26.53:6443 max_fails=3 fail_timeout=30s;
}
server {
listen 127.0.0.1:8443;
proxy_connect_timeout 1s;
proxy_pass backend;
}
}
EOF
- 复制到集群节点
## 复制到集群节点
nginx-1.24.0]# scp -r /usr/local/nginx root@k8s-51:/usr/local/nginx/
nginx-1.24.0]# scp -r /usr/local/nginx root@k8s-52:/usr/local/nginx/
nginx-1.24.0]# scp -r /usr/local/nginx root@k8s-53:/usr/local/nginx/
- 启动配置文件/etc/systemd/system/kube-nginx.service
# 写入启动配置文件
cat > /etc/systemd/system/kube-nginx.service <<EOF
[Unit]
Description=kube-apiserver nginx proxy
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=forking
ExecStartPre=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx -t
ExecStart=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx
ExecReload=/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/kube-nginx.conf -p /usr/local/nginx -s reload
PrivateTmp=true
Restart=always
RestartSec=5
StartLimitInterval=0
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
- 设置开机自启并检查启动是否成功
# 设置开机自启
]# systemctl enable --now kube-nginx
]# systemctl restart kube-nginx
]# systemctl status kube-nginx
7.3 部署kube-apiserver
- k8s-51：/usr/lib/systemd/system/kube-apiserver.service
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-apiserver \\
--v=2 \\
--allow-privileged=true \\
--bind-address=0.0.0.0 \\
--secure-port=6443 \\
--advertise-address=192.168.26.51 \\
--service-cluster-ip-range=10.168.0.0/16 \\
--service-node-port-range=30000-32767 \\
--etcd-servers=https://192.168.26.51:2379,https://192.168.26.52:2379,https://192.168.26.53:2379 \\
--etcd-cafile=/opt/cert/etcd-ca.pem \\
--etcd-certfile=/opt/cert/etcd.pem \\
--etcd-keyfile=/opt/cert/etcd-key.pem \\
--client-ca-file=/opt/cert/ca.pem \\
--tls-cert-file=/opt/cert/apiserver.pem \\
--tls-private-key-file=/opt/cert/apiserver-key.pem \\
--kubelet-client-certificate=/opt/cert/apiserver.pem \\
--kubelet-client-key=/opt/cert/apiserver-key.pem \\
--service-account-key-file=/opt/cert/sa.pub \\
--service-account-signing-key-file=/opt/cert/sa.key \\
--service-account-issuer=https://kubernetes.default.svc.cluster.local \\
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \\
--authorization-mode=Node,RBAC \\
--enable-bootstrap-token-auth=true \\
--requestheader-client-ca-file=/opt/cert/front-proxy-ca.pem \\
--proxy-client-cert-file=/opt/cert/front-proxy-client.pem \\
--proxy-client-key-file=/opt/cert/front-proxy-client-key.pem \\
--requestheader-allowed-names=aggregator \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/opt/cert/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
- k8s-52：/usr/lib/systemd/system/kube-apiserver.service
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-apiserver \\
--v=2 \\
--allow-privileged=true \\
--bind-address=0.0.0.0 \\
--secure-port=6443 \\
--advertise-address=192.168.26.52 \\
--service-cluster-ip-range=10.168.0.0/16 \\
--service-node-port-range=30000-32767 \\
--etcd-servers=https://192.168.26.51:2379,https://192.168.26.52:2379,https://192.168.26.53:2379 \\
--etcd-cafile=/opt/cert/etcd-ca.pem \\
--etcd-certfile=/opt/cert/etcd.pem \\
--etcd-keyfile=/opt/cert/etcd-key.pem \\
--client-ca-file=/opt/cert/ca.pem \\
--tls-cert-file=/opt/cert/apiserver.pem \\
--tls-private-key-file=/opt/cert/apiserver-key.pem \\
--kubelet-client-certificate=/opt/cert/apiserver.pem \\
--kubelet-client-key=/opt/cert/apiserver-key.pem \\
--service-account-key-file=/opt/cert/sa.pub \\
--service-account-signing-key-file=/opt/cert/sa.key \\
--service-account-issuer=https://kubernetes.default.svc.cluster.local \\
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \\
--authorization-mode=Node,RBAC \\
--enable-bootstrap-token-auth=true \\
--requestheader-client-ca-file=/opt/cert/front-proxy-ca.pem \\
--proxy-client-cert-file=/opt/cert/front-proxy-client.pem \\
--proxy-client-key-file=/opt/cert/front-proxy-client-key.pem \\
--requestheader-allowed-names=aggregator \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/opt/cert/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
- k8s-53：/usr/lib/systemd/system/kube-apiserver.service
cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-apiserver \\
--v=2 \\
--allow-privileged=true \\
--bind-address=0.0.0.0 \\
--secure-port=6443 \\
--advertise-address=192.168.26.53 \\
--service-cluster-ip-range=10.168.0.0/16 \\
--service-node-port-range=30000-32767 \\
--etcd-servers=https://192.168.26.51:2379,https://192.168.26.52:2379,https://192.168.26.53:2379 \\
--etcd-cafile=/opt/cert/etcd-ca.pem \\
--etcd-certfile=/opt/cert/etcd.pem \\
--etcd-keyfile=/opt/cert/etcd-key.pem \\
--client-ca-file=/opt/cert/ca.pem \\
--tls-cert-file=/opt/cert/apiserver.pem \\
--tls-private-key-file=/opt/cert/apiserver-key.pem \\
--kubelet-client-certificate=/opt/cert/apiserver.pem \\
--kubelet-client-key=/opt/cert/apiserver-key.pem \\
--service-account-key-file=/opt/cert/sa.pub \\
--service-account-signing-key-file=/opt/cert/sa.key \\
--service-account-issuer=https://kubernetes.default.svc.cluster.local \\
--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota \\
--authorization-mode=Node,RBAC \\
--enable-bootstrap-token-auth=true \\
--requestheader-client-ca-file=/opt/cert/front-proxy-ca.pem \\
--proxy-client-cert-file=/opt/cert/front-proxy-client.pem \\
--proxy-client-key-file=/opt/cert/front-proxy-client-key.pem \\
--requestheader-allowed-names=aggregator \\
--requestheader-group-headers=X-Remote-Group \\
--requestheader-extra-headers-prefix=X-Remote-Extra- \\
--requestheader-username-headers=X-Remote-User \\
--enable-aggregator-routing=true
# --feature-gates=IPv6DualStack=true
# --token-auth-file=/opt/cert/token.csv
Restart=on-failure
RestartSec=10s
LimitNOFILE=65535
[Install]
WantedBy=multi-user.target
EOF
- 启动apiserver（所有master节点）
]# systemctl daemon-reload && systemctl enable --now kube-apiserver
## 注意查看状态是否启动正常
]# systemctl status kube-apiserver
]# curl -k --cacert /opt/cert/ca.pem \
--cert /opt/cert/apiserver.pem \
--key /opt/cert/apiserver-key.pem \
https://192.168.26.51:6443/healthz
ok
]# ip_head='192.168.26';for i in 51 52 53;do \
curl -k --cacert /opt/cert/ca.pem \
--cert /opt/cert/apiserver.pem \
--key /opt/cert/apiserver-key.pem \
https://${ip_head}.${i}:6443/healthz; \
done
okokok
7.4 kubectl配置
- 创建admin.kubeconfig。使用 nginx方案，
-server=https://127.0.0.1:8443。在一个节点执行一次即可
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/cert/ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:8443 \
--kubeconfig=/opt/cert/admin.kubeconfig
kubectl config set-credentials kubernetes-admin \
--client-certificate=/opt/cert/admin.pem \
--client-key=/opt/cert/admin-key.pem \
--embed-certs=true \
--kubeconfig=/opt/cert/admin.kubeconfig
kubectl config set-context kubernetes-admin@kubernetes \
--cluster=kubernetes \
--user=kubernetes-admin \
--kubeconfig=/opt/cert/admin.kubeconfig
kubectl config use-context kubernetes-admin@kubernetes --kubeconfig=/opt/cert/admin.kubeconfig
]# mkdir ~/.kube
]# cp /opt/cert/admin.kubeconfig ~/.kube/config
]# scp -r ~/.kube root@k8s-52:~/.
]# scp -r ~/.kube root@k8s-51:~/.
- 配置kubectl子命令补全
~]# echo 'source <(kubectl completion bash)' >> ~/.bashrc
~]# yum -y install bash-completion
~]# source /usr/share/bash-completion/bash_completion
~]# source <(kubectl completion bash)
~]# kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Unhealthy Get "https://127.0.0.1:10259/healthz": dial tcp 127.0.0.1:10259: connect: connection refused
controller-manager Unhealthy Get "https://127.0.0.1:10257/healthz": dial tcp 127.0.0.1:10257: connect: connection refused
etcd-0 Healthy
etcd-2 Healthy
etcd-1 Healthy
7.5 部署kube-controller-manager
所有master节点配置，且配置相同。 10.26.0.0/16为pod网段，按需求设置你自己的网段。
- 创建启动配置：/usr/lib/systemd/system/kube-controller-manager.service
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-controller-manager \\
--v=2 \\
--bind-address=0.0.0.0 \\
--root-ca-file=/opt/cert/ca.pem \\
--cluster-signing-cert-file=/opt/cert/ca.pem \\
--cluster-signing-key-file=/opt/cert/ca-key.pem \\
--service-account-private-key-file=/opt/cert/sa.key \\
--kubeconfig=/opt/cert/controller-manager.kubeconfig \\
--leader-elect=true \\
--use-service-account-credentials=true \\
--node-monitor-grace-period=40s \\
--node-monitor-period=5s \\
--controllers=*,bootstrapsigner,tokencleaner \\
--allocate-node-cidrs=true \\
--service-cluster-ip-range=10.168.0.0/16 \\
--cluster-cidr=10.26.0.0/16 \\
--node-cidr-mask-size-ipv4=24 \\
--requestheader-client-ca-file=/opt/cert/front-proxy-ca.pem
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
- 创建kube-controller-manager.kubeconfig。使用 nginx方案，
-server=https://127.0.0.1:8443。在一个节点执行一次即可。
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/cert/ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:8443 \
--kubeconfig=/opt/cert/controller-manager.kubeconfig
## 设置一个环境项，一个上下文
kubectl config set-context system:kube-controller-manager@kubernetes \
--cluster=kubernetes \
--user=system:kube-controller-manager \
--kubeconfig=/opt/cert/controller-manager.kubeconfig
## 设置一个用户项
kubectl config set-credentials system:kube-controller-manager \
--client-certificate=/opt/cert/controller-manager.pem \
--client-key=/opt/cert/controller-manager-key.pem \
--embed-certs=true \
--kubeconfig=/opt/cert/controller-manager.kubeconfig
## 设置默认环境
kubectl config use-context system:kube-controller-manager@kubernetes \
--kubeconfig=/opt/cert/controller-manager.kubeconfig
## 复制/opt/cert/controller-manager.kubeconfig到其它节点
]# scp /opt/cert/controller-manager.kubeconfig root@k8s-51:/opt/cert/controller-manager.kubeconfig
]# scp /opt/cert/controller-manager.kubeconfig root@k8s-52:/opt/cert/controller-manager.kubeconfig
- 启动kube-controller-manager，并查看状态
]# systemctl daemon-reload
]# systemctl enable --now kube-controller-manager
]# systemctl status kube-controller-manager
]# kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Unhealthy Get "https://127.0.0.1:10259/healthz": dial tcp 127.0.0.1:10259: connect: connection refused
controller-manager Healthy ok
etcd-0 Healthy
etcd-2 Healthy
etcd-1 Healthy
7.6 部署kube-schedule
- 创建启动配置：/usr/lib/systemd/system/kube-scheduler.service
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-scheduler \\
--v=2 \\
--bind-address=0.0.0.0 \\
--leader-elect=true \\
--kubeconfig=/opt/cert/scheduler.kubeconfig
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
- 创建scheduler.kubeconfig。使用 nginx方案，
-server=https://127.0.0.1:8443。在一个节点执行一次即可。
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/cert/ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:8443 \
--kubeconfig=/opt/cert/scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler \
--client-certificate=/opt/cert/scheduler.pem \
--client-key=/opt/cert/scheduler-key.pem \
--embed-certs=true \
--kubeconfig=/opt/cert/scheduler.kubeconfig
kubectl config set-context system:kube-scheduler@kubernetes \
--cluster=kubernetes \
--user=system:kube-scheduler \
--kubeconfig=/opt/cert/scheduler.kubeconfig
kubectl config use-context system:kube-scheduler@kubernetes \
--kubeconfig=/opt/cert/scheduler.kubeconfig
## 复制/opt/cert/scheduler.kubeconfig到其它节点
]# scp /opt/cert/scheduler.kubeconfig root@k8s-51:/opt/cert/scheduler.kubeconfig
]# scp /opt/cert/scheduler.kubeconfig root@k8s-52:/opt/cert/scheduler.kubeconfig
- 启动并查看服务状态
]# systemctl daemon-reload
]# systemctl enable --now kube-scheduler
]# systemctl status kube-scheduler
]# kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy ok
7.7 配置bootstrapping
- 创建bootstrap-kubelet.kubeconfig。使用 nginx方案，
-server=https://127.0.0.1:8443。在一个节点执行一次即可。
kubectl config set-cluster kubernetes \
--certificate-authority=/opt/cert/ca.pem \
--embed-certs=true --server=https://127.0.0.1:8443 \
--kubeconfig=/opt/cert/bootstrap-kubelet.kubeconfig
kubectl config set-credentials tls-bootstrap-token-user \
--token=bc5692.ebcfbe81d917383c \
--kubeconfig=/opt/cert/bootstrap-kubelet.kubeconfig
kubectl config set-context tls-bootstrap-token-user@kubernetes \
--cluster=kubernetes \
--user=tls-bootstrap-token-user \
--kubeconfig=/opt/cert/bootstrap-kubelet.kubeconfig
kubectl config use-context tls-bootstrap-token-user@kubernetes \
--kubeconfig=/opt/cert/bootstrap-kubelet.kubeconfig
## 复制/opt/cert/bootstrap-kubelet.kubeconfig到其它节点
]# scp /opt/cert/bootstrap-kubelet.kubeconfig root@k8s-51:/opt/cert/bootstrap-kubelet.kubeconfig
]# scp /opt/cert/bootstrap-kubelet.kubeconfig root@k8s-52:/opt/cert/bootstrap-kubelet.kubeconfig
token的位置在bootstrap.secret.yaml（附：yaml文件：bootstrap.secret.yaml），如果修改的话到这个文件修改。
## 创建token。（也可以自已定义）
~]# head -c 16 /dev/urandom | od -An -t x | tr -d ' '
bc5692ebcfbe81d917383c89e60d4388
- bootstrap.secret.yaml
## 修改：
apiVersion: v1
kind: Secret
metadata:
name: bootstrap-token-bc5692 ##修改，对应token前6位
namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
description: "The default bootstrap token generated by 'kubelet '."
token-id: bc5692 ##修改，对应token前6位
token-secret: ebcfbe81d917383c ##修改，对应token前7-22位共16个字符
...
yaml]# kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-bc5692 created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created
7.8 部署kubelet
- 创建目录
~]# mkdir /data/kubernetes/data/kubelet -p
- 启动文件/usr/lib/systemd/system/kubelet.service。默认使用docker作为Runtime。
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=cri-dockerd.service
Requires=cri-dockerd.service
[Service]
WorkingDirectory=/data/kubernetes/data/kubelet
ExecStart=/opt/bin/kubelet \\
--bootstrap-kubeconfig=/opt/cert/bootstrap-kubelet.kubeconfig \\
--cert-dir=/opt/cert \\
--kubeconfig=/opt/cert/kubelet.kubeconfig \\
--config=/opt/cfg/kubelet.json \\
--container-runtime-endpoint=unix:///var/run/cri-dockerd.sock \\
--pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.9 \\
--root-dir=/data/kubernetes/data/kubelet \\
--v=2
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
/opt/cert/kubelet.kubeconfig为自动创建的文件，如果已存在就删除
- 所有k8s节点创建kubelet的配置文件/opt/cfg/kubelet.json
cat > /opt/cfg/kubelet.json << EOF
{
"kind": "KubeletConfiguration",
"apiVersion": "kubelet.config.k8s.io/v1beta1",
"authentication": {
"x509": {
"clientCAFile": "/opt/cert/ca.pem"
},
"webhook": {
"enabled": true,
"cacheTTL": "2m0s"
},
"anonymous": {
"enabled": false
}
},
"authorization": {
"mode": "Webhook",
"webhook": {
"cacheAuthorizedTTL": "5m0s",
"cacheUnauthorizedTTL": "30s"
}
},
"address": "192.168.26.51",
"port": 10250,
"readOnlyPort": 10255,
"cgroupDriver": "systemd",
"hairpinMode": "promiscuous-bridge",
"serializeImagePulls": false,
"clusterDomain": "cluster.local.",
"clusterDNS": ["10.168.0.2"]
}
EOF
注意修改：“address”: “192.168.26.51”；“address”: “192.168.26.52”； “address”: “192.168.26.53”
- 启动
~]# systemctl daemon-reload
~]# systemctl enable --now kubelet
~]# systemctl status kubelet
~]# kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
k8s-51 NotReady <none> 4m2s v1.28.3 192.168.26.51 <none> CentOS Linux 7 (Core) 3.10.0-1160.90.1.el7.x86_64 docker://24.0.6
k8s-52 NotReady <none> 3m29s v1.28.3 192.168.26.52 <none> CentOS Linux 7 (Core) 3.10.0-1160.90.1.el7.x86_64 docker://24.0.6
k8s-53 NotReady <none> 5m50s v1.28.3 192.168.26.53 <none> CentOS Linux 7 (Core) 3.10.0-1160.90.1.el7.x86_64 docker://24.0.6
## 查看kubelet证书请求
~]# kubectl get csr
NAME AGE SIGNERNAME REQUESTOR REQUESTEDDURATION CONDITION
node-csr-CfHXXoZlsfKqXMmSk3SiSSdte1lvZBCnHrHAH9rP3YU 4m11s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:bc5692 <none> Approved,Issued
node-csr-OFq3aEDV9qALiEcPTAdd-KhCphY3oNuNo3FY5Bmwf6Y 6m32s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:bc5692 <none> Approved,Issued
node-csr-PWhp9MLFoGuZBW1PQ8s-_QP0V--W46FtuURrgviMtRU 4m44s kubernetes.io/kube-apiserver-client-kubelet system:bootstrap:bc5692 <none>
## 如果处于Pending状态，则批准申请
~]# kubectl certificate approve node-csr-......
如果node仍然是NotReady，则需要安装cni-plugin-flannel。（参见后面的核心插件部署）
~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-51 NotReady <none> 5m33s v1.28.3
k8s-52 NotReady <none> 5m v1.28.3
k8s-53 NotReady <none> 7m21s v1.28.3
7.9 部署kube-proxy
- 创建kube-proxy.kubeconfig。使用 nginx方案，
-server=https://127.0.0.1:8443。在一个节点执行一次即可。
]# kubectl config set-cluster kubernetes \
--certificate-authority=/opt/cert/ca.pem \
--embed-certs=true \
--server=https://127.0.0.1:8443 \
--kubeconfig=/opt/cert/kube-proxy.kubeconfig
]# kubectl config set-credentials kube-proxy \
--client-certificate=/opt/cert/kube-proxy.pem \
--client-key=/opt/cert/kube-proxy-key.pem \
--embed-certs=true \
--kubeconfig=/opt/cert/kube-proxy.kubeconfig
]# kubectl config set-context kube-proxy@kubernetes \
--cluster=kubernetes \
--user=kube-proxy \
--kubeconfig=/opt/cert/kube-proxy.kubeconfig
]# kubectl config use-context kube-proxy@kubernetes --kubeconfig=/opt/cert/kube-proxy.kubeconfig
## 复制/opt/cert/kube-proxy.kubeconfig到各节点
]# scp /opt/cert/kube-proxy.kubeconfig root@k8s-51:/opt/cert/kube-proxy.kubeconfig
]# scp /opt/cert/kube-proxy.kubeconfig root@k8s-52:/opt/cert/kube-proxy.kubeconfig
- 所有k8s节点添加kube-proxy的service文件
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Kube Proxy
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
ExecStart=/opt/bin/kube-proxy \\
--config=/opt/cfg/kube-proxy.yaml \\
--v=2
Restart=always
RestartSec=10s
[Install]
WantedBy=multi-user.target
EOF
- 所有k8s节点添加kube-proxy的配置
cat > /opt/cfg/kube-proxy.yaml << EOF
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 0.0.0.0
clientConnection:
acceptContentTypes: ""
burst: 10
contentType: application/vnd.kubernetes.protobuf
kubeconfig: /opt/cert/kube-proxy.kubeconfig
qps: 5
clusterCIDR: 10.26.0.0/16
configSyncPeriod: 15m0s
conntrack:
max: null
maxPerCore: 32768
min: 131072
tcpCloseWaitTimeout: 1h0m0s
tcpEstablishedTimeout: 24h0m0s
enableProfiling: false
healthzBindAddress: 0.0.0.0:10256
hostnameOverride: ""
iptables:
masqueradeAll: false
masqueradeBit: 14
minSyncPeriod: 0s
syncPeriod: 30s
ipvs:
masqueradeAll: true
minSyncPeriod: 5s
scheduler: "rr"
syncPeriod: 30s
kind: KubeProxyConfiguration
metricsBindAddress: 127.0.0.1:10249
mode: "ipvs"
nodePortAddresses: null
oomScoreAdj: -999
portRange: ""
udpIdleTimeout: 250ms
EOF
- 启动
]# systemctl daemon-reload
]# systemctl enable --now kube-proxy
]# systemctl status kube-proxy
八、k8s核心插件
8.1 部署CNI网络插件装
- 官方链接
https://github.com/containernetworking/plugins
下载：cni-plugins-linux-amd64-v1.2.0.tgz：https://github.com/containernetworking/plugins/releases/download/v1.2.0/cni-plugins-linux-amd64-v1.2.0.tgz
https://github.com/flannel-io/cni-plugin
下载：cni-plugin-flannel-linux-amd64-v1.2.0.tgz：https://github.com/flannel-io/cni-plugin/releases/download/v1.2.0/cni-plugin-flannel-linux-amd64-v1.2.0.tgz
- 下载、解压、分发
]# mkdir -p /opt/cni/bin
]# cd /opt/cni/bin
]# curl -O -L https://github.com/containernetworking/plugins/releases/download/v1.2.0/cni-plugins-linux-amd64-v1.2.0.tgz
]# curl -O -L https://github.com/flannel-io/cni-plugin/releases/download/v1.2.0/cni-plugin-flannel-linux-amd64-v1.2.0.tgz
]# tar -C /opt/cni/bin -xzf cni-plugins-linux-amd64-v1.2.0.tgz
]# tar -C /opt/cni/bin -xzf cni-plugin-flannel-linux-amd64-v1.2.0.tgz
]# mv flannel-amd64 flannel
]# ls -l /opt/cni/bin
总用量 71296
-rwxr-xr-x 1 root root 3859475 1月 17 2023 bandwidth
-rwxr-xr-x 1 root root 4299004 1月 17 2023 bridge
-rwxr-xr-x 1 root root 10167415 1月 17 2023 dhcp
-rwxr-xr-x 1 root root 3986082 1月 17 2023 dummy
-rwxr-xr-x 1 root root 4385098 1月 17 2023 firewall
-rwxr-xr-x 1 root root 2414517 7月 21 23:04 flannel
-rwxr-xr-x 1 root root 3870731 1月 17 2023 host-device
-rwxr-xr-x 1 root root 3287319 1月 17 2023 host-local
-rwxr-xr-x 1 root root 3999593 1月 17 2023 ipvlan
-rwxr-xr-x 1 root root 3353028 1月 17 2023 loopback
-rwxr-xr-x 1 root root 4029261 1月 17 2023 macvlan
-rwxr-xr-x 1 root root 3746163 1月 17 2023 portmap
-rwxr-xr-x 1 root root 4161070 1月 17 2023 ptp
-rwxr-xr-x 1 root root 3550152 1月 17 2023 sbr
-rwxr-xr-x 1 root root 2845685 1月 17 2023 static
-rwxr-xr-x 1 root root 3437180 1月 17 2023 tuning
-rwxr-xr-x 1 root root 3993252 1月 17 2023 vlan
]# scp -r /opt/cni/bin root@k8s-51:/opt/cni/.
]# scp -r /opt/cni/bin root@k8s-52:/opt/cni/.
- 创建
/etc/cni/net.d/10-flannel.conflist
~]# mkdir /etc/cni/net.d -p
~]# vi /etc/cni/net.d/10-flannel.conflist
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
- 查看节点状态
~]# kubectl get nodes
~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-51 Ready <none> 4h33m v1.28.3
k8s-52 Ready <none> 4h32m v1.28.3
k8s-53 Ready <none> 4h34m v1.28.3
8.2 部署服务发现插件CoreDNS
- 下载：
- 修改：
__DNS__DOMAIN__ 改为： cluster.local
__DNS__MEMORY__LIMIT__ 改为： 150Mi
__DNS__SERVER__ 改为： 10.168.0.2
image: docker pull registry.aliyuncs.com/google_containers/coredns:v1.10.1
- 执行：
cfg]# kubectl apply -f coredns.yaml
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created
deployment.apps/coredns created
service/kube-dns created
cfg]# kubectl get pod -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system coredns-877fbbc8f-6jp22 0/1 Running 0 21s 10.26.25.10 k8s-53 <none> <none>
READY状态不正常处理
~]# kubectl -n kube-system describe pod coredns-6dffdfd7fb-6jp22
## 出现以下信息
...
... Warning Unhealthy 24m (x199 over 79m) kubelet Readiness probe failed: Get "http://10.26.25.8:8181/ready": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
... Warning Unhealthy 14m (x13 over 77m) kubelet Readiness probe failed: Get "http://10.26.25.8:8181/ready": dial tcp 10.26.25.8:8181: connect: no route to host
... Warning BackOff 9m47s (x179 over 70m) kubelet Back-off restarting failed container coredns in pod coredns-6dffdfd7fb-6jp22_kube-system(0b37a912-2233-4d96-9d3c-ec67a9d1b004)
... Warning Unhealthy 4m54s (x97 over 78m) kubelet Liveness probe failed: Get "http://10.26.25.8:8080/health": dial tcp 10.26.25.8:8080: connect: no route to host
...
## 在k8s-53上ping 10.26.25.10，发现主机k8s-53 ping不通自己主机上的pod
## 查看路由，发现10.26.25.0有两条路由
k8s-53 ~]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.26.2 0.0.0.0 UG 100 0 0 ens32
10.26.6.0 10.26.6.0 255.255.255.0 UG 0 0 0 flannel.1
10.26.25.0 0.0.0.0 255.255.255.0 U 0 0 0 docker0
10.26.25.0 0.0.0.0 255.255.255.0 U 0 0 0 cni0
10.26.75.0 10.26.75.0 255.255.255.0 UG 0 0 0 flannel.1
192.168.26.0 0.0.0.0 255.255.255.0 U 100 0 0 ens32
## 删除一条路由
k8s-53 ~]# route del -net 10.26.25.0 netmask 255.255.255.0 gw 0.0.0.0
## 等一会查看pod状态，正常
]# kubectl get pod -A -owide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system coredns-6dffdfd7fb-6jp22 1/1 Running 130 (9m9s ago) 21h 10.26.25.10 k8s-53 <none> <none>
8.3 部署资源监控插件Metrics-server
Kubernetes中系统资源的采集均使用Metrics-server，通过Metrics采集节点和Pod的内存、磁盘、CPU和网络的使用率。
- 下载：https://github.com/kubernetes-sigs/metrics-server/
https://github.com/kubernetes-sigs/metrics-server/releases/download/v0.6.4/components.yaml
https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml
- 版本适配查看：https://github.com/kubernetes-sigs/metrics-server/#readme
- 修改配置：
yaml]# vi components.yaml
# 1
- --cert-dir=/tmp
- --secure-port=4443
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --kubelet-use-node-status-port
- --metric-resolution=15s
- --kubelet-insecure-tls
- --requestheader-client-ca-file=/opt/cert/front-proxy-ca.pem
- --requestheader-username-headers=X-Remote-User
- --requestheader-group-headers=X-Remote-Group
- --requestheader-extra-headers-prefix=X-Remote-Extra-
# 2
volumeMounts:
- mountPath: /tmp
name: tmp-dir
- name: ca-ssl
mountPath: /opt/cert
# 3
volumes:
- emptyDir: {}
name: tmp-dir
- name: ca-ssl
hostPath:
path: /opt/cert
# 4 修改为image镜像
image: registry.aliyuncs.com/google_containers/metrics-server:v0.6.4
- 执行
cfg]# kubectl apply -f components.yaml
serviceaccount/metrics-server created
clusterrole.rbac.authorization.k8s.io/system:aggregated-metrics-reader created
clusterrole.rbac.authorization.k8s.io/system:metrics-server created
rolebinding.rbac.authorization.k8s.io/metrics-server-auth-reader created
clusterrolebinding.rbac.authorization.k8s.io/metrics-server:system:auth-delegator created
clusterrolebinding.rbac.authorization.k8s.io/system:metrics-server created
service/metrics-server created
deployment.apps/metrics-server created
apiservice.apiregistration.k8s.io/v1beta1.metrics.k8s.io created
cfg]# kubectl get pod -n kube-system | grep metrics
metrics-server-7747f5f88b-hxfzn 0/1 Running 0 27s
## READY状态正常，参考之前的处理
]# kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-51 92m 4% 706Mi 19%
k8s-52 83m 4% 682Mi 18%
k8s-53 105m 5% 702Mi 19%
]# kubectl top pod -n kube-system
NAME CPU(cores) MEMORY(bytes)
coredns-6dffdfd7fb-6jp22 2m 16Mi
metrics-server-7747f5f88b-hxfzn 3m 24Mi
8.4 部署dashboard
- 下载：https://github.com/kubernetes/dashboard
https://github.com/kubernetes/dashboard/blob/v2.7.0/aio/deploy/recommended.yaml
- 修改：]# vi recommended.yaml
...
image: kubernetesui/dashboard:v2.7.0
imagePullPolicy: IfNotPresent #修改
...
image: kubernetesui/metrics-scraper:v1.0.8
imagePullPolicy: IfNotPresent #修改
...
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
type: NodePort #新增
ports:
- port: 443
targetPort: 8443
nodePort: 32310 #新增
selector:
k8s-app: kubernetes-dashboard
...
- 执行
]# kubectl apply -f recommended.yaml
namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created
]# kubectl get pods,svc -n kubernetes-dashboard
NAME READY STATUS RESTARTS AGE
pod/dashboard-metrics-scraper-5657497c4c-5x67m 1/1 Running 0 27s
pod/kubernetes-dashboard-5b749d9495-qrhpk 1/1 Running 0 27s
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/dashboard-metrics-scraper ClusterIP 10.168.39.58 <none> 8000/TCP 27s
service/kubernetes-dashboard NodePort 10.168.91.23 <none> 443:32310/TCP 27s
-
创建admin-user：]# vi dashboard-adminuser.yaml
https://github.com/kubernetes/dashboard/blob/master/docs/user/access-control/creating-sample-user.md
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kubernetes-dashboard
]# kubectl apply -f dashboard-adminuser.yaml
serviceaccount/admin-user created
clusterrolebinding.rbac.authorization.k8s.io/admin-user created
## 创建登录token
]# kubectl -n kubernetes-dashboard create token admin-user
eyJhbGciOiJSUzI1NiIsImtpZCI6Im1uRzB2bllQbEkxd2pocnZKS2JUSXlFSnQ3SXMwTjRncW9XOGF1cFlJOVkifQ.eyJhdWQiOlsiaHR0cHM6Ly9rdWJlcm5ldGVzLmRlZmF1bHQuc3ZjLmNsdXN0ZXIubG9jYWwiXSwiZXhwIjoxNjk4MDMwODExLCJpYXQiOjE2OTgwMjcyMTEsImlzcyI6Imh0dHBzOi8va3ViZXJuZXRlcy5kZWZhdWx0LnN2Yy5jbHVzdGVyLmxvY2FsIiwia3ViZXJuZXRlcy5pbyI6eyJuYW1lc3BhY2UiOiJrdWJlcm5ldGVzLWRhc2hib2FyZCIsInNlcnZpY2VhY2NvdW50Ijp7Im5hbWUiOiJhZG1pbi11c2VyIiwidWlkIjoiNjI2MmNmMGQtYzMyMi00NzcxLTk3ZDctYWY2YjUwYTAzYmUzIn19LCJuYmYiOjE2OTgwMjcyMTEsInN1YiI6InN5c3RlbTpzZXJ2aWNlYWNjb3VudDprdWJlcm5ldGVzLWRhc2hib2FyZDphZG1pbi11c2VyIn0.o3GG09-WyCE1bRFm_6z81DR7KVBkZkKuBtAy7H1GslMCFemSrimlTH_F2DEiSYZoT8ud1W95q0Xi0YYYl0GIC6xd3Jmo5XkKYqvWbQiRl90PrSXtQNG4wJIc2nwNXvlS5zKqjnKZNhpmw1_QhkUQJjvPZyKo9Zah5D5JU_cC6bJUpQhec5vkk6AtaxvkoaD8MB2L6RBoBv5l5bNmRkVPa52BbHpbUoQmY2hAaMIMdLEzbDv7w6Bi__HckVsIsNppFY1nn2hIaUPlrJz2Ns-XnUUywcWRmrTJ0oewZl2nnsuPOQny_JJeSQFYz8vu5kCP6SqVjGjnJb69Ukh9mgr5yg
- 浏览器访问：https://192.168.26.51:32310
九、集群验证与总结
9.1 部署pod验证
]# vi busybox.yaml
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: docker.io/library/busybox:1.28
imagePullPolicy: IfNotPresent
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
]# kubectl apply -f busybox.yaml
pod/busybox created
]# kubectl get pod
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 0 59s
9.2 部署service验证
cat > nginx.yaml << "EOF"
---
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-web
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.19.6
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 80
targetPort: 80
nodePort: 30001
protocol: TCP
type: NodePort
selector:
name: nginx
EOF
]# kubectl apply -f nginx.yaml
]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 16 (52m ago) 34h 10.26.6.6 k8s-51 <none> <none>
nginx-web-68gpj 0/1 ContainerCreating 0 95s <none> k8s-53 <none> <none>
nginx-web-zjk4b 0/1 ContainerCreating 0 95s <none> k8s-52 <none> <none>
## 要拉取镜像，需要等一会
]# kubectl get all
...
]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.168.0.1 <none> 443/TCP 47h
nginx-service-nodeport NodePort 10.168.238.209 <none> 80:30001/TCP 3m4s
浏览器访问：http://192.168.26.53:30001/
9.3 创建3个副本在不同的节点上
cat > nginx-deployment.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
EOF
]# kubectl apply -f nginx-deployment.yaml
deployment.apps/nginx-deployment created
]# kubectl get pod -owide |grep nginx-deployment
nginx-deployment-64888c994d-4qqb6 1/1 Running 0 3m6s 10.26.25.13 k8s-53 <none> <none>
nginx-deployment-64888c994d-h76v9 1/1 Running 0 3m6s 10.26.6.8 k8s-51 <none> <none>
nginx-deployment-64888c994d-n85lg 1/1 Running 0 3m6s 10.26.75.11 k8s-52 <none> <none> <none>
]# kubectl delete -f nginx-deployment.yaml
9.4 用pod解析默认命名空间中的kubernetes
]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.168.0.1 <none> 443/TCP 47h
nginx-service-nodeport NodePort 10.168.238.209 <none> 80:30001/TCP 8m54s
]# kubectl exec busybox -n default -- nslookup kubernetes
Server: 10.168.0.2
Address 1: 10.168.0.2 kube-dns.kube-system.svc.cluster.local
Name: kubernetes
Address 1: 10.168.0.1 kubernetes.default.svc.cluster.local
9.5 测试跨命名空间是否可以解析
]# kubectl exec busybox -n default -- nslookup kube-dns.kube-system
Server: 10.168.0.2
Address 1: 10.168.0.2 kube-dns.kube-system.svc.cluster.local
Name: kube-dns.kube-system
Address 1: 10.168.0.2 kube-dns.kube-system.svc.cluster.local
9.6 每个节点都必须要能访问Kubernetes的kubernetes svc 443和kube-dns的service 53
]# kubectl get svc -A
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes ClusterIP 10.168.0.1 <none> 443/TCP 47h
default nginx-service-nodeport NodePort 10.168.238.209 <none> 80:30001/TCP 10m
kube-system kube-dns ClusterIP 10.168.0.2 <none> 53/UDP,53/TCP,9153/TCP 22h
kube-system metrics-server ClusterIP 10.168.241.18 <none> 443/TCP 82m
kubernetes-dashboard dashboard-metrics-scraper ClusterIP 10.168.39.58 <none> 8000/TCP 45m
kubernetes-dashboard kubernetes-dashboard NodePort 10.168.91.23 <none> 443:32310/TCP 45m
~]# telnet 10.168.0.1 443
Trying 10.168.0.1...
Connected to 10.168.0.1.
Escape character is '^]'.
~]# telnet 10.168.0.2 53
Trying 10.168.0.2...
Connected to 10.168.0.2.
Escape character is '^]'.
~]# curl 10.168.0.1:443
Client sent an HTTP request to an HTTPS server.
~]# curl 10.168.0.2:53
curl: (52) Empty reply from server
9.7 Pod和其它主机及Pod之间能通
~]# kubectl get po -owide -A
default busybox 1/1 Running 17 (4m7s ago) 34h 10.26.6.6 k8s-51 <none> <none>
default nginx-deployment-64888c994d-4qqb6 1/1 Running 0 7m54s 10.26.25.13 k8s-53 <none> <none>
default nginx-deployment-64888c994d-h76v9 1/1 Running 0 7m54s 10.26.6.8 k8s-51 <none> <none>
default nginx-deployment-64888c994d-n85lg 1/1 Running 0 7m54s 10.26.75.11 k8s-52 <none> <none>
default nginx-web-68gpj 1/1 Running 0 12m 10.26.25.12 k8s-53 <none> <none>
default nginx-web-zjk4b 1/1 Running 0 12m 10.26.75.10 k8s-52 <none> <none>
kube-system coredns-6dffdfd7fb-6jp22 1/1 Running 130 (92m ago) 22h 10.26.25.10 k8s-53 <none> <none>
kube-system metrics-server-7747f5f88b-hxfzn 1/1 Running 2 (83m ago) 84m 10.26.75.9 k8s-52 <none> <none>
kubernetes-dashboard dashboard-metrics-scraper-5657497c4c-5x67m 1/1 Running 0 47m 10.26.25.11 k8s-53 <none> <none>
kubernetes-dashboard kubernetes-dashboard-5b749d9495-qrhpk 1/1 Running 0 47m 10.26.6.7 k8s-51 <none> <none>
进入busybox ping其他节点上的pod。可以连通证明这个pod是可以跨命名空间和跨主机通信的。
]# kubectl exec -ti busybox -- sh
## 主机k8s-51上的pod ping主机k8s-53（POD - 跨主机）
/ # ping 192.168.26.53 -c 3
PING 192.168.26.53 (192.168.26.53): 56 data bytes
64 bytes from 192.168.26.53: seq=0 ttl=63 time=0.227 ms
64 bytes from 192.168.26.53: seq=1 ttl=63 time=0.434 ms
64 bytes from 192.168.26.53: seq=2 ttl=63 time=0.817 ms
...
## 主机k8s-51上的pod ping主机k8s-53节点上的pod（跨主机跨命名空间）
/ # ping 10.26.25.13 -c 3
PING 10.26.25.13 (10.26.25.13): 56 data bytes
64 bytes from 10.26.25.13: seq=0 ttl=62 time=0.503 ms
64 bytes from 10.26.25.13: seq=1 ttl=62 time=0.526 ms
64 bytes from 10.26.25.13: seq=2 ttl=62 time=0.571 ms
...
## 从主机k8s-51节点ping k8s-52上的pod（跨主机 - POD）
k8s-51 ~]# ping 10.26.75.11 -c 3
PING 10.26.75.11 (10.26.75.11) 56(84) bytes of data.
64 bytes from 10.26.75.11: icmp_seq=1 ttl=63 time=0.595 ms
64 bytes from 10.26.75.11: icmp_seq=2 ttl=63 time=0.541 ms
64 bytes from 10.26.75.11: icmp_seq=3 ttl=63 time=0.432 ms
...
至此，完美完成以二进制方式部署Kubernetes1.27.6 + docker24.0.6高可用集群。
9.8 总结
碰到以下相关问题时可能需要花几小时或更长时间来处理。
- 二进制软件部署flannel v0.22.3网络，使用的etcd是版本3，与之前使用版本2不同。查看官方文档进行了解。
- 以
vxlan方式部署flannel网络插件后，需要根据生成的FLANNEL_SUBNET更新docker配置文件中的bip参数。 FLANNEL_SUBNET根据写入etcd的数据在重启时生成，因此修改/run/flannel/subnet.env文件中的变量值无效。后续采用host-gw方式部署，采用手动创建/run/flannel/subnet.env文件，就不会有这个问题，和docker集成时采用规划的ip网段。（后续验证）- 部署CNI插件，解决node状态成为正常
Ready。 - 需要安装ipvs管理工具及模块，否则kube-proxy会报错。
- 部署CoreDNS和Metrics-server时，pod状态不正常的处理。
附：learn k8s map
附：yaml文件
https://www.notion.so/yaml-6d8f19758949478b96d2934fbd554283?pvs=21
01 bootstrap.secret.yaml
cat > bootstrap.secret.yaml << EOF
apiVersion: v1
kind: Secret
metadata:
name: bootstrap-token-bc5692
namespace: kube-system
type: bootstrap.kubernetes.io/token
stringData:
description: "The default bootstrap token generated by 'kubelet '."
token-id: bc5692
token-secret: ebcfbe81d917383c
usage-bootstrap-authentication: "true"
usage-bootstrap-signing: "true"
auth-extra-groups: system:bootstrappers:default-node-token,system:bootstrappers:worker,system:bootstrappers:ingress
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubelet-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:node-bootstrapper
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-bootstrap
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:nodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:bootstrappers:default-node-token
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: node-autoapprove-certificate-rotation
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:certificates.k8s.io:certificatesigningrequests:selfnodeclient
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: Group
name: system:nodes
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:kube-apiserver-to-kubelet
rules:
- apiGroups:
- ""
resources:
- nodes/proxy
- nodes/stats
- nodes/log
- nodes/spec
- nodes/metrics
verbs:
- "*"
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: system:kube-apiserver
namespace: ""
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:kube-apiserver-to-kubelet
subjects:
- apiGroup: rbac.authorization.k8s.io
kind: User
name: kube-apiserver
EOF
02 coredns.yaml.base
# __MACHINE_GENERATED_WARNING__
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
labels:
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: Reconcile
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes
verbs:
- get
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
addonmanager.kubernetes.io/mode: EnsureExists
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
labels:
addonmanager.kubernetes.io/mode: EnsureExists
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes __DNS__DOMAIN__ in-addr.arpa ip6.arpa {
pods insecure
fallthrough in-addr.arpa ip6.arpa
ttl 30
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. In order to make Addon Manager do not reconcile this replicas parameter.
# 2. Default is 1.
# 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
securityContext:
seccompProfile:
type: RuntimeDefault
priorityClassName: system-cluster-critical
serviceAccountName: coredns
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
containers:
- name: coredns
image: registry.k8s.io/coredns/coredns:v1.10.1
imagePullPolicy: IfNotPresent
resources:
limits:
memory: __DNS__MEMORY__LIMIT__
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
addonmanager.kubernetes.io/mode: Reconcile
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: __DNS__SERVER__
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
03 components.yaml.yaml（metrics-server）
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
k8s-app: metrics-server
rbac.authorization.k8s.io/aggregate-to-admin: "true"
rbac.authorization.k8s.io/aggregate-to-edit: "true"
rbac.authorization.k8s.io/aggregate-to-view: "true"
name: system:aggregated-metrics-reader
rules:
- apiGroups:
- metrics.k8s.io
resources:
- pods
- nodes
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
k8s-app: metrics-server
name: system:metrics-server
rules:
- apiGroups:
- ""
resources:
- nodes/metrics
verbs:
- get
- apiGroups:
- ""
resources:
- pods
- nodes
verbs:
- get
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
k8s-app: metrics-server
name: metrics-server-auth-reader
namespace: kube-system
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
k8s-app: metrics-server
name: metrics-server:system:auth-delegator
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:auth-delegator
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
labels:
k8s-app: metrics-server
name: system:metrics-server
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:metrics-server
subjects:
- kind: ServiceAccount
name: metrics-server
namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
spec:
ports:
- name: https
port: 443
protocol: TCP
targetPort: https
selector:
k8s-app: metrics-server
---
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
k8s-app: metrics-server
name: metrics-server
namespace: kube-system
spec:
selector:
matchLabels:
k8s-app: metrics-server
strategy:
rollingUpdate:
maxUnavailable: 0
template:
metadata:
labels:
k8s-app: metrics-server
spec:
containers:
- args:
- --cert-dir=/tmp
- --secure-port=4443
- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
- --kubelet-use-node-status-port
- --metric-resolution=15s
image: registry.k8s.io/metrics-server/metrics-server:v0.6.4
imagePullPolicy: IfNotPresent
livenessProbe:
failureThreshold: 3
httpGet:
path: /livez
port: https
scheme: HTTPS
periodSeconds: 10
name: metrics-server
ports:
- containerPort: 4443
name: https
protocol: TCP
readinessProbe:
failureThreshold: 3
httpGet:
path: /readyz
port: https
scheme: HTTPS
initialDelaySeconds: 20
periodSeconds: 10
resources:
requests:
cpu: 100m
memory: 200Mi
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
runAsNonRoot: true
runAsUser: 1000
volumeMounts:
- mountPath: /tmp
name: tmp-dir
nodeSelector:
kubernetes.io/os: linux
priorityClassName: system-cluster-critical
serviceAccountName: metrics-server
volumes:
- emptyDir: {}
name: tmp-dir
---
apiVersion: apiregistration.k8s.io/v1
kind: APIService
metadata:
labels:
k8s-app: metrics-server
name: v1beta1.metrics.k8s.io
spec:
group: metrics.k8s.io
groupPriorityMinimum: 100
insecureSkipTLSVerify: true
service:
name: metrics-server
namespace: kube-system
version: v1beta1
versionPriority: 100
04 recommended.yaml
# Copyright 2017 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# <http://www.apache.org/licenses/LICENSE-2.0>
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
apiVersion: v1
kind: Namespace
metadata:
name: kubernetes-dashboard
---
apiVersion: v1
kind: ServiceAccount
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
---
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
type: NodePort
ports:
- port: 443
targetPort: 8443
nodePort: 30237
selector:
k8s-app: kubernetes-dashboard
---
apiVersion: v1
kind: Secret
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard-certs
namespace: kubernetes-dashboard
type: Opaque
---
apiVersion: v1
kind: Secret
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard-csrf
namespace: kubernetes-dashboard
type: Opaque
data:
csrf: ""
---
apiVersion: v1
kind: Secret
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard-key-holder
namespace: kubernetes-dashboard
type: Opaque
---
kind: ConfigMap
apiVersion: v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard-settings
namespace: kubernetes-dashboard
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
rules:
# Allow Dashboard to get, update and delete Dashboard exclusive secrets.
- apiGroups: [""]
resources: ["secrets"]
resourceNames: ["kubernetes-dashboard-key-holder", "kubernetes-dashboard-certs", "kubernetes-dashboard-csrf"]
verbs: ["get", "update", "delete"]
# Allow Dashboard to get and update 'kubernetes-dashboard-settings' config map.
- apiGroups: [""]
resources: ["configmaps"]
resourceNames: ["kubernetes-dashboard-settings"]
verbs: ["get", "update"]
# Allow Dashboard to get metrics.
- apiGroups: [""]
resources: ["services"]
resourceNames: ["heapster", "dashboard-metrics-scraper"]
verbs: ["proxy"]
- apiGroups: [""]
resources: ["services/proxy"]
resourceNames: ["heapster", "http:heapster:", "https:heapster:", "dashboard-metrics-scraper", "http:dashboard-metrics-scraper"]
verbs: ["get"]
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
rules:
# Allow Metrics Scraper to get metrics from the Metrics server
- apiGroups: ["metrics.k8s.io"]
resources: ["pods", "nodes"]
verbs: ["get", "list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: Role
name: kubernetes-dashboard
subjects:
- kind: ServiceAccount
name: kubernetes-dashboard
namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: kubernetes-dashboard
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: kubernetes-dashboard
subjects:
- kind: ServiceAccount
name: kubernetes-dashboard
namespace: kubernetes-dashboard
---
kind: Deployment
apiVersion: apps/v1
metadata:
labels:
k8s-app: kubernetes-dashboard
name: kubernetes-dashboard
namespace: kubernetes-dashboard
spec:
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
k8s-app: kubernetes-dashboard
template:
metadata:
labels:
k8s-app: kubernetes-dashboard
spec:
securityContext:
seccompProfile:
type: RuntimeDefault
containers:
- name: kubernetes-dashboard
image: kubernetesui/dashboard:v2.7.0
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8443
protocol: TCP
args:
- --auto-generate-certificates
- --namespace=kubernetes-dashboard
# Uncomment the following line to manually specify Kubernetes API server Host
# If not specified, Dashboard will attempt to auto discover the API server and connect
# to it. Uncomment only if the default does not work.
# - --apiserver-host=http://my-address:port
volumeMounts:
- name: kubernetes-dashboard-certs
mountPath: /certs
# Create on-disk volume to store exec logs
- mountPath: /tmp
name: tmp-volume
livenessProbe:
httpGet:
scheme: HTTPS
path: /
port: 8443
initialDelaySeconds: 30
timeoutSeconds: 30
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
runAsUser: 1001
runAsGroup: 2001
volumes:
- name: kubernetes-dashboard-certs
secret:
secretName: kubernetes-dashboard-certs
- name: tmp-volume
emptyDir: {}
serviceAccountName: kubernetes-dashboard
nodeSelector:
"kubernetes.io/os": linux
# Comment the following tolerations if Dashboard must not be deployed on master
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
---
kind: Service
apiVersion: v1
metadata:
labels:
k8s-app: dashboard-metrics-scraper
name: dashboard-metrics-scraper
namespace: kubernetes-dashboard
spec:
ports:
- port: 8000
targetPort: 8000
selector:
k8s-app: dashboard-metrics-scraper
---
kind: Deployment
apiVersion: apps/v1
metadata:
labels:
k8s-app: dashboard-metrics-scraper
name: dashboard-metrics-scraper
namespace: kubernetes-dashboard
spec:
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
k8s-app: dashboard-metrics-scraper
template:
metadata:
labels:
k8s-app: dashboard-metrics-scraper
spec:
securityContext:
seccompProfile:
type: RuntimeDefault
containers:
- name: dashboard-metrics-scraper
image: kubernetesui/metrics-scraper:v1.0.8
imagePullPolicy: IfNotPresent
ports:
- containerPort: 8000
protocol: TCP
livenessProbe:
httpGet:
scheme: HTTP
path: /
port: 8000
initialDelaySeconds: 30
timeoutSeconds: 30
volumeMounts:
- mountPath: /tmp
name: tmp-volume
securityContext:
allowPrivilegeEscalation: false
readOnlyRootFilesystem: true
runAsUser: 1001
runAsGroup: 2001
serviceAccountName: kubernetes-dashboard
nodeSelector:
"kubernetes.io/os": linux
# Comment the following tolerations if Dashboard must not be deployed on master
tolerations:
- key: node-role.kubernetes.io/master
effect: NoSchedule
volumes:
- name: tmp-volume
emptyDir: {}
05 dashboard-adminuser.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
name: admin-user
namespace: kubernetes-dashboard
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: admin-user
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: cluster-admin
subjects:
- kind: ServiceAccount
name: admin-user
namespace: kubernetes-dashboard
06 nginx.yaml
---
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-web
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.19.6
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 80
targetPort: 80
nodePort: 30001
protocol: TCP
type: NodePort
selector:
name: nginx
07 nginx-deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx-deployment
labels:
app: nginx
spec:
replicas: 3
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
ports:
- containerPort: 80
08 busybox.yaml
apiVersion: v1
kind: Pod
metadata:
name: busybox
namespace: default
spec:
containers:
- name: busybox
image: docker.io/library/busybox:1.28
imagePullPolicy: IfNotPresent
command:
- sleep
- "3600"
imagePullPolicy: IfNotPresent
restartPolicy: Always
