kubeadmin部署k8s1.27.4
环境介绍
| IP | 主机名 | 资源配置 | 系统版本 |
|---|---|---|---|
| 192.168.117.170 | k8s-master | 2c2g200g | Centos7.9 |
| 192.168.117.171 | k8s-node1 | 2c2g200g | Centos7.9 |
| 192.168.117.172 | k8s-node2 | 2c2g200g | Centos7.9 |
编辑本地解析且修改主机名
三台主机都要做
vim /etc/hosts
配置主机名
master
[root@k8s-master ~]# hostnamectl set-hostname k8s-master
node1
[root@k8s-node1 ~]# hostnamectl set-hostname k8s-node1
node2
[root@k8s-node2 ~]# hostnamectl set-hostname k8s-node2
master节点产成ssh密钥拷贝给node节点实现免密登录
[root@k8s-master ~]# ssh-keygen
[root@k8s-master ~]# ssh-copy-id k8s-node1
[root@k8s-master ~]# ssh-copy-id k8s-node2
开启路由转发功能
所有节点
##添加配置文件
[root@k8s-master ~]# cat > /etc/sysctl.d/k8s.conf <<EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness = 0
EOF
##加载br_netfilter模块 && 查看是否加载
[root@k8s-master ~]# modprobe br_netfilter && lsmod | grep br_netfilter
br_netfilter 22256 0
bridge 151336 1 br_netfilter
##加载⽹桥过滤及内核转发配置⽂件
[root@k8s-master ~]# sysctl -p /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
vm.swappiness = 0
配置阿里云yum源
所有节点
[root@k8s-master ~] cd /etc/yum.repos.d/
[root@k8s-master yum.repos.d]# mv CentOS-Base.repo CentOS-Base.repo.bak
[root@k8s-master yum.repos.d]# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
[root@k8s-master yum.repos.d]# yum clean all && yum makecache
配置ipvs功能
所有节点
[root@k8s-master ~]# yum -y install ipset ipvsadm
##编辑需要添加的模块儿
[root@k8s-master ~]# cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
EOF
##给予执行权限
[root@k8s-master ~]# chmod 755 /etc/sysconfig/modules/ipvs.modules
##运行模块儿脚本
[root@k8s-master ~]# bash /etc/sysconfig/modules/ipvs.modules
##检验是否成功
[root@k8s-master ~]# lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 12688 0
ip_vs_wrr 12697 0
ip_vs_rr 12600 0
ip_vs 145458 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack_netlink 36396 0
nfnetlink 14519 2 nf_conntrack_netlink
nf_conntrack_ipv4 15053 2
nf_defrag_ipv4 12729 1 nf_conntrack_ipv4
nf_conntrack 139264 7 ip_vs,nf_nat,nf_nat_ipv4,xt_conntrack,nf_nat_masquerade_ipv4,nf_conntrack_netlink,nf_conntrack_ipv4
libcrc32c 12644 4 xfs,ip_vs,nf_nat,nf_conntrack
关闭防火墙、内核以及swap分区
[root@k8s-master ~]# systemctl stop firewalld
[root@k8s-master ~]# setenforce 0
setenforce: SELinux is disabled
[root@k8s-master ~]# swapoff -a （临时关闭）
##永久关闭需要在/etc/fstab文件中注释掉
#/dev/mapper/centos-swap swap swap defaults 0 0
安装Docker
所有节点
[root@k8s-master ~]# curl https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker.repo
[root@k8s-master ~]# yum -y install docker-ce
配置docker加速器及Cgroup驱动程序
[root@k8s-master ~]# cat > /etc/docker/daemon.json <<EOF
{
"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn",
"https://docker.m.daocloud.io",
"http://hub-mirrors.c.163.com"],
"max-concurrent-downloads": 10,
"log-driver": "json-file",
"log-level": "warn",
"data-root": "/var/lib/docker",
"exec-opts": ["native.cgroupdriver=systemd"]
}
EOF
启动docker并设置开机自启
[root@k8s-master ~]# systemctl daemon-reload
[root@k8s-master ~]# systemctl enable --now docker
安装cri-docker
所有节点
作为接替 Docker 运行时的 Containerd 在早在 Kubernetes1.7 时就能直接与 Kubelet 集成使用，只是大部分时候我们因熟悉 Docker，在部署集群时采用了默认的 dockershim。在V1.24起的版本的 kubelet 就彻底移除了dockershim，改为默认使用Containerd了，当然也使用 cri-dockerd适配器来将Docker Engine与 Kubernetes 集成。可以参考官方文档：
https://kubernetes.io/zh-cn/docs/setup/production-environment/container-runtimes/#docker
CRI-Dockerd cri-dockerd是什么:
https://blog.51cto.com/u_16099281/6469310
##下载压缩包
[root@k8s-master ~]# wget https://github.com/Mirantis/cri-dockerd/releases/download/v0.3.4/cri-dockerd-0.3.4.amd64.tgz
##解压
[root@k8s-master ~]# tar zxvf cri-dockerd-0.3.4.amd64.tgz
##拷贝二进制命令文件
[root@k8s-master ~]# cp cri-dockerd/* root@k8s-node1: /usr/bin/
##发送给node1节点
[root@k8s-master ~]# scp cri-dockerd/* root@k8s-node1:/usr/bin/
##发送给node2节点
[root@k8s-master ~]# scp cri-dockerd/* root@k8s-node2:/usr/bin/
##配置systemctl管理
[root@k8s-master ~]# vim /usr/lib/systemd/system/cri-docker.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
[Service]
Type=notify
ExecStart=/usr/bin/cri-dockerd --network-plugin=cni --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.7
ExecReload=/bin/kill -s HUP $MAINPID
TimeoutSec=0
RestartSec=2
Restart=always
StartLimitBurst=3
StartLimitInterval=60s
LimitNOFILE=infinity
LimitNPROC=infinity
LimitCORE=infinity
TasksMax=infinity
Delegate=yes
KillMode=process
[Install]
WantedBy=multi-user.target
[root@k8s-master ~]# vim /usr/lib/systemd/system/cri-docker.socket
[Unit]
Description=CRI Docker Socket for the API
PartOf=cri-docker.service
[Socket]
ListenStream=%t/cri-dockerd.sock
SocketMode=0660
SocketUser=root
SocketGroup=docker
[Install]
WantedBy=sockets.target
[root@k8s-master ~]# systemctl daemon-reload
[root@k8s-master ~]# systemctl enable --now cri-docker
Created symlink from /etc/systemd/system/multi-user.target.wants/cri-docker.service to /usr/lib/systemd/system/cri-docker.service.
[root@k8s-master ~]# systemctl status cri-docker
安装kubelet、kubeadm、kubectl（有个小坑，之前更换阿里源里面没有这些包，需要再添加一个）
##添加源
[root@k8s-master ~]# cd /etc/yum.repos.d/
[root@k8s-master yum.repos.d]# vim kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
exclude=kubelet kubeadm kubectl
##下载
[root@k8s-master ~]# yum -y install kubelet-1.27.4-0 kubeadm-1.27.4-0 kubectl-1.27.4-0 --disableexcludes=kubernetes
##设置kubelet开机自启
[root@k8s-master ~]# systemctl enable --now kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
##初始化之前kubelet无法启动，可以查看它的状态，下面这种情况代表正在等待指令
[root@k8s-master ~]# systemctl is-active kubelet
activating
kubeadm初始化
##参数解释
--image-repository registry.aliyuncs.com/google_containers：使用阿里云镜像仓库
--kubernetes-version=v1.27.3：指定k8s的版本
--pod-network-cidr=10.10.20.0/24：指定pod的网段
--cri-socket unix:///var/run/cri-dockerd.sock：指定容器运行时的Socket文件路径，原本默认是dockershim.sock，但现在改成cri-docker.sock
maste节点
[root@k8s-master ~]# kubeadm init \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.27.4 \
--pod-network-cidr=10.10.20.0/24 \
--cri-socket unix:///var/run/cri-dockerd.sock
## 初始化成功后根据回显创建文件，并记录下节点加入集群的命令
kubeadm join 192.168.117.171:6443 --token jvb30p.4a9rnaqyls3ag0y5 \
--discovery-token-ca-cert-hash sha256:1a7cb15fbb63034879b8d1139de2d5e72f9a7c14027fe8daa16512825a48c920
master创建文件
[root@k8s-master ~]# mkdir -p $HOME/.kube
[root@k8s-master ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@k8s-master ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
若是出了问题可以使用 kubeadm reset 清除所有配置和数据重新初始化
加入集群
所有node节点执行
kubeadm join 192.168.117.171:6443 --token jvb30p.4a9rnaqyls3ag0y5 --discovery-token-ca-cert-hash sha256:1a7cb15fbb63034879b8d1139de2d5e72f9a7c14027fe8daa16512825a48c920 --cri-socket unix:///var/run/cri-dockerd.sock
注意加入 --cri-socket unix:///var/run/cri-dockerd.sock 参数
mastet节点查看
[root@k8s-master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master NotReady control-plane 144m v1.27.4
k8s-node1 NotReady <none> 50s v1.27.4
k8s-node2 NotReady <none> 4s v1.27.4
配置网络插件
我这边用的是calico网络插件
master下载kube-flannel.yml文件
curl -O https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
修改网段 改初始化时配置的网段
提前拉取所需镜像
##所有节点都要拉取
docker pull docker.io/flannel/flannel-cni-plugin:v1.2.0
docker pull image: docker.io/flannel/flannel:v0.22.3
写入三行内容
- key: node.kubernetes.io/not-ready
operator: Exists
effect: NoSchedule
[root@k8s-master ~]# kubectl apply -f kube-flannel.yml
配置网络组件calico
calico官网：https://docs.tigera.io/calico/latest/getting-started/kubernetes/quickstart#install-calico
下载这两个文件并上传到master
[root@k8s-master ~]# kubectl create -f tigera-operator.yaml
[root@k8s-master ~]# vim custom-resources.yaml
## 这个要和master初始化网段保持一致
[root@k8s-master ~]# kubectl apply -f custom-resources.yaml
[root@k8s-master ~]# kubectl get pod -n calico-system
验证集群可用性
[root@k8s-master ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master Ready control-plane 92m v1.27.4
k8s-node1 Ready <none> 90m v1.27.4
k8s-node2 Ready <none> 89m v1.27.4
查看集群健康情况,理想状态
[root@k8s-master ~]# kubectl get cs
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy
查看kubernetes集群pod运⾏情况
[root@k8s-master ~]# kubectl get pod -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-7bdc4cb885-bx4cq 1/1 Running 0 93m
coredns-7bdc4cb885-th6ft 1/1 Running 0 93m
etcd-k8s-master 1/1 Running 0 93m
kube-apiserver-k8s-master 1/1 Running 0 93m
kube-controller-manager-k8s-master 1/1 Running 0 93m
kube-proxy-btqbd 1/1 Running 0 91m
kube-proxy-j4qxl 1/1 Running 0 90m
kube-proxy-qhx4j 1/1 Running 0 93m
kube-scheduler-k8s-master 1/1 Running 0 93m
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