Kubeadm介绍
1.通俗点讲，kubeadm跟minikube一样，都是一个搭建kubernetes环境一个工具；
区别在于：minikube是搭建单机kubernetes环境的一个工具
kubeadm是搭建集群kubernetes环境的一个工具，这个常用；
2.对于具体的使用说明，大家可以参考下面的地址去学习(中英文都有)
使用Kubeamd搭建kubernetes集群环境
首先准备一个三台的centos机器
1.三台机器需要能够互相ping通
2.三台机器的网段需要一致，保持在一个网络之中；
3.搭建可以参考下面的地址
yum -y update [在三台机器上执行更新包]
yum -y update
[root@manager-node ~]# yum install -y conntrack ipvsadm ipset jq sysstat curl iptables libseccomp
[root@manager-node ~]# yum install -y conntrack ipvsadm ipset jq sysstat curl iptables libseccomp
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: ftp.sjtu.edu.cn
* extras: mirror.bit.edu.cn
* updates: mirror.bit.edu.cn
Package ipset-7.1-1.el7.x86_64 already installed and latest version
No package jq available.
Package curl-7.29.0-54.el7_7.1.x86_64 already installed and latest version
Package iptables-1.4.21-33.el7.x86_64 already installed and latest version
Package libseccomp-2.3.1-3.el7.x86_64 already installed and latest version
Resolving Dependencies
--> Running transaction check
---> Package conntrack-tools.x86_64 0:1.4.4-5.el7_7.2 will be installed
--> Processing Dependency: libnetfilter_cttimeout.so.1(LIBNETFILTER_CTTIMEOUT_1.1)(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
--> Processing Dependency: libnetfilter_cttimeout.so.1(LIBNETFILTER_CTTIMEOUT_1.0)(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
--> Processing Dependency: libnetfilter_cthelper.so.0(LIBNETFILTER_CTHELPER_1.0)(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
--> Processing Dependency: libnetfilter_queue.so.1()(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
--> Processing Dependency: libnetfilter_cttimeout.so.1()(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
--> Processing Dependency: libnetfilter_cthelper.so.0()(64bit) for package: conntrack-tools-1.4.4-5.el7_7.2.x86_64
---> Package ipvsadm.x86_64 0:1.27-7.el7 will be installed
---> Package sysstat.x86_64 0:10.1.5-18.el7 will be installed
--> Processing Dependency: libsensors.so.4()(64bit) for package: sysstat-10.1.5-18.el7.x86_64
--> Running transaction check
---> Package libnetfilter_cthelper.x86_64 0:1.0.0-10.el7_7.1 will be installed
---> Package libnetfilter_cttimeout.x86_64 0:1.0.0-6.el7_7.1 will be installed
---> Package libnetfilter_queue.x86_64 0:1.0.2-2.el7_2 will be installed
---> Package lm_sensors-libs.x86_64 0:3.4.0-8.20160601gitf9185e5.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===================================================================================================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================================================================================================
Installing:
conntrack-tools x86_64 1.4.4-5.el7_7.2 updates 187 k
ipvsadm x86_64 1.27-7.el7 base 45 k
sysstat x86_64 10.1.5-18.el7 base 315 k
Installing for dependencies:
libnetfilter_cthelper x86_64 1.0.0-10.el7_7.1 updates 18 k
libnetfilter_cttimeout x86_64 1.0.0-6.el7_7.1 updates 18 k
libnetfilter_queue x86_64 1.0.2-2.el7_2 base 23 k
lm_sensors-libs x86_64 3.4.0-8.20160601gitf9185e5.el7 base 42 k
Transaction Summary
===================================================================================================================================================================================================================
Install 3 Packages (+4 Dependent packages)
Total download size: 647 k
Installed size: 1.9 M
Downloading packages:
(1/7): ipvsadm-1.27-7.el7.x86_64.rpm | 45 kB 00:00:00
(2/7): lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64.rpm | 42 kB 00:00:00
(3/7): libnetfilter_cthelper-1.0.0-10.el7_7.1.x86_64.rpm | 18 kB 00:00:00
(4/7): libnetfilter_cttimeout-1.0.0-6.el7_7.1.x86_64.rpm | 18 kB 00:00:00
(5/7): sysstat-10.1.5-18.el7.x86_64.rpm | 315 kB 00:00:00
(6/7): libnetfilter_queue-1.0.2-2.el7_2.x86_64.rpm | 23 kB 00:00:00
(7/7): conntrack-tools-1.4.4-5.el7_7.2.x86_64.rpm | 187 kB 00:00:00
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 721 kB/s | 647 kB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : libnetfilter_cttimeout-1.0.0-6.el7_7.1.x86_64 1/7
Installing : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 2/7
Installing : libnetfilter_queue-1.0.2-2.el7_2.x86_64 3/7
Installing : libnetfilter_cthelper-1.0.0-10.el7_7.1.x86_64 4/7
Installing : conntrack-tools-1.4.4-5.el7_7.2.x86_64 5/7
Installing : sysstat-10.1.5-18.el7.x86_64 6/7
Installing : ipvsadm-1.27-7.el7.x86_64 7/7
Verifying : libnetfilter_cthelper-1.0.0-10.el7_7.1.x86_64 1/7
Verifying : conntrack-tools-1.4.4-5.el7_7.2.x86_64 2/7
Verifying : libnetfilter_queue-1.0.2-2.el7_2.x86_64 3/7
Verifying : ipvsadm-1.27-7.el7.x86_64 4/7
Verifying : sysstat-10.1.5-18.el7.x86_64 5/7
Verifying : lm_sensors-libs-3.4.0-8.20160601gitf9185e5.el7.x86_64 6/7
Verifying : libnetfilter_cttimeout-1.0.0-6.el7_7.1.x86_64 7/7
Installed:
conntrack-tools.x86_64 0:1.4.4-5.el7_7.2 ipvsadm.x86_64 0:1.27-7.el7 sysstat.x86_64 0:10.1.5-18.el7
Dependency Installed:
docker 安装 [在三台机器上都要这么执行]
卸载docker
[root@manager-node ~]# sudo yum remove docker \
docker-client \
docker-client-latest \
docker-common \
docker-latest \
docker-latest-logrotate \
docker-logrotate \
docker-engine
-----------------------------------
安装Docker的依赖
[root@manager-node ~]# sudo yum install -y yum-utils \
device-mapper-persistent-data \
lvm2
指定一下Docker的仓库
[root@manager-node ~]# sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: fastestmirror
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
[root@manager-node ~]#
-----------------------------------
开始安装（这里我们指定版本18.09.0）
[vagrant@localhost ~]$ yum install -y docker-ce-18.09.0 docker-ce-cli-18.09.0 containerd.io
就此安装完成
开始启动
[root@manager-node ~]# sudo systemctl start docker
设置开机启动
[root@manager-node ~]# sudo systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
[root@manager-node ~]#
修改三台机器的hosts文件
manager-node节点
设置服务器的hostname为manager-node 主要是用于hosts文件解析
[root@manager-node ~]# hostnamectl set-hostname manager-node
设置hosts文件 新增下面的配置项目
192.168.1.111 manager-node
192.168.1.122 workder01-node
192.168.1.133 workder02-node
workder01-node节点
设置服务器的hostname为workder01-node 主要是用于hosts文件解析
[root@worker01-node ~]# hostnamectl set-hostname worker01-node
[root@worker01-node ~]#
设置hosts文件 新增下面的配置项目
192.168.1.111 manager-node
192.168.1.122 workder01-node
192.168.1.133 workder02-node
workder02-node节点
设置服务器的hostname为workder02-node 主要是用于hosts文件解析
[root@worker02-node ~]# hostnamectl set-hostname workder02-node
设置hosts文件 新增下面的配置项目
192.168.1.111 manager-node
192.168.1.122 workder01-node
192.168.1.133 workder02-node
备注
1.这里注意下，修改hosts文件之后，无需执行其他命令，会自动生效，
因为dns域名解析，实时去访问hosts文件去解析的；
测试域名解析(任意节点去ping其他的节点都能ping通)
[root@worker02-node ~]# hostnamectl set-hostname workder02-node
[root@worker02-node ~]# vi /etc/hosts
[root@worker02-node ~]# ping manager-node
PING manager-node (192.168.1.111) 56(84) bytes of data.
64 bytes from manager-node (192.168.1.111): icmp_seq=1 ttl=64 time=1.48 ms
64 bytes from manager-node (192.168.1.111): icmp_seq=2 ttl=64 time=0.609 ms
^Z
[1]+ Stopped ping manager-node
[root@worker02-node ~]#
-----------------------------------
系统配置(三台机器全部执行,这个我都是基于官网的要求去做的)
关闭防火墙[使得集群之间的ip端口能否都可以ping通]
[root@manager-node ~]# systemctl stop firewalld &&
关闭selinux [这个也是一个安全的linux模块，可以指明某个进程可以访问的资源]
[root@manager-node ~]# setenforce 0
[root@manager-node ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
[root@manager-node ~]#
关闭swap
1.swap类似windows中的虚拟内存，如果内存不足了，可以通过swap转换硬盘，获取内存
[root@manager-node ~]# swapoff -a
[root@manager-node ~]# sed -i '/swap/s/^\(.*\)$/#\1/g' /etc/fstab
配置iptables的ACCEPT规则
[root@manager-node ~]# iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat && iptables -P FORWARD ACCEPT
设置系统参数
执行脚本
cat <<EOF > /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
执行样例
[root@manager-node ~]# cat <<EOF > /etc/sysctl.d/k8s.conf
> net.bridge.bridge-nf-call-ip6tables = 1
> net.bridge.bridge-nf-call-iptables = 1
> EOF
[root@manager-node ~]#
[root@manager-node ~]# sysctl --system
* Applying /usr/lib/sysctl.d/00-system.conf ...
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0
* Applying /usr/lib/sysctl.d/10-default-yama-scope.conf ...
kernel.yama.ptrace_scope = 0
* Applying /usr/lib/sysctl.d/50-default.conf ...
kernel.sysrq = 16
kernel.core_uses_pid = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.conf.all.promote_secondaries = 1
fs.protected_hardlinks = 1
fs.protected_symlinks = 1
* Applying /etc/sysctl.d/99-sysctl.conf ...
* Applying /etc/sysctl.d/k8s.conf ...
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
* Applying /etc/sysctl.conf ...
[root@manager-node ~]#
-----------------------------------
Installing kubeadm, kubelet and kubectl
kubeadm: the command to bootstrap the cluster.
kubelet: the component that runs on all of the machines in your cluster and does things like starting pods and containers.
kubectl: the command line util to talk to your cluster.
-----------------------------------
配置安装的yum源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
-----------------------------------
1.这里注意下，cat 相当于显示输出的内容
<<EOF 相当于文件开始
后面的EOF相当于文件结束的标记
/etc/yum.repos.d/kubernetes.repo 是输入的那个文件中
文件中的内容是是下面这些；
文件内容
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
-----------------------------------
安装kubeadm&kubelet&kubectl
查看kubeadm的版本，并且排序
[root@manager-node ~]# yum list kubeadm --showduplicates | sort -r
* updates: mirror.bit.edu.cn
Loading mirror speeds from cached hostfile
......
kubeadm.x86_64 1.14.9-0 kubernetes
kubeadm.x86_64 1.14.8-0 kubernetes
kubeadm.x86_64 1.14.7-0 kubernetes
kubeadm.x86_64 1.14.6-0 kubernetes
kubeadm.x86_64 1.14.5-0 kubernetes
kubeadm.x86_64 1.14.4-0 kubernetes
....
Available Packages
[root@manager-node ~]#
-----------------------------------
[root@manager-node ~]# yum install -y kubeadm-1.14.0-0 kubelet-1.14.0-0 kubectl-1.14.0-0
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: ftp.sjtu.edu.cn
* extras: mirror.bit.edu.cn
* updates: mirror.bit.edu.cn
No package kubeadm-1.14.0-0 available.
No package kubelet-1.14.0-0 available.
No package kubectl-1.14.0-0 available.
Error: Nothing to do
[root@manager-node ~]#
[root@manager-node ~]# cat /etc/yum.repos.d/kubernetes.repo
cat: /etc/yum.repos.d/kubernetes.repo: No such file or directory
[root@manager-node ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo
> [kubernetes]
> name=Kubernetes
> baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
> enabled=1
> gpgcheck=0
> repo_gpgcheck=0
> gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
> http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
> EOF
[root@manager-node ~]# cat /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
[root@manager-node ~]#
[root@manager-node ~]#
[root@manager-node ~]#
[root@manager-node ~]#
[root@manager-node ~]# > baseurl=http://mirrors.
-bash: baseurl=http://mirrors.: No such file or directory
[root@manager-node ~]# vi /etc/docker/daemon.json
[root@manager-node ~]# systemctl restart docker
[root@manager-node ~]# sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
sed: can't read /etc/systemd/system/kubelet.service.d/10-kubeadm.conf: No such file or directory
[root@manager-node ~]# sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
sed: can't read /etc/systemd/system/kubelet.service.d/10-kubeadm.conf: No such file or directory
[root@manager-node ~]# systemctl enable kubelet && systemctl start kubelet
Failed to execute operation: No such file or directory
[root@manager-node ~]# yum install -y kubeadm-1.14.0-0 kubelet-1.14.0-0 kubectl-1.14.0-0
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: ftp.sjtu.edu.cn
* extras: mirror.bit.edu.cn
* updates: mirror.bit.edu.cn
kubernetes | 1.4 kB 00:00:00
kubernetes/primary | 61 kB 00:00:00
kubernetes 442/442
Resolving Dependencies
--> Running transaction check
---> Package kubeadm.x86_64 0:1.14.0-0 will be installed
--> Processing Dependency: kubernetes-cni >= 0.7.5 for package: kubeadm-1.14.0-0.x86_64
--> Processing Dependency: cri-tools >= 1.11.0 for package: kubeadm-1.14.0-0.x86_64
---> Package kubectl.x86_64 0:1.14.0-0 will be installed
---> Package kubelet.x86_64 0:1.14.0-0 will be installed
--> Processing Dependency: socat for package: kubelet-1.14.0-0.x86_64
--> Running transaction check
---> Package cri-tools.x86_64 0:1.13.0-0 will be installed
---> Package kubernetes-cni.x86_64 0:0.7.5-0 will be installed
---> Package socat.x86_64 0:1.7.3.2-2.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===================================================================================================================================================================================================================
Package Arch Version Repository Size
===================================================================================================================================================================================================================
Installing:
kubeadm x86_64 1.14.0-0 kubernetes 8.7 M
kubectl x86_64 1.14.0-0 kubernetes 9.5 M
kubelet x86_64 1.14.0-0 kubernetes 23 M
Installing for dependencies:
cri-tools x86_64 1.13.0-0 kubernetes 5.1 M
kubernetes-cni x86_64 0.7.5-0 kubernetes 10 M
socat x86_64 1.7.3.2-2.el7 base 290 k
Transaction Summary
===================================================================================================================================================================================================================
Install 3 Packages (+3 Dependent packages)
Total download size: 57 M
Installed size: 258 M
Downloading packages:
(1/6): fea2c041b42bef6e4de4ee45eee4456236f2feb3d66572ac310f857676fe9598-kubeadm-1.14.0-0.x86_64.rpm | 8.7 MB 00:00:40
(2/6): 14bfe6e75a9efc8eca3f638eb22c7e2ce759c67f95b43b16fae4ebabde1549f3-cri-tools-1.13.0-0.x86_64.rpm | 5.1 MB 00:00:45
(3/6): 2b52e839216dfc620bd1429cdb87d08d00516eaa75597ad4491a9c1e7db3c392-kubectl-1.14.0-0.x86_64.rpm | 9.5 MB 00:00:25
(4/6): socat-1.7.3.2-2.el7.x86_64.rpm | 290 kB 00:00:10
(5/6): 6089961a11403e579c547532462e16b1bb1f97ec539e4671c4c15f377c427c18-kubelet-1.14.0-0.x86_64.rpm | 23 MB 00:02:31
(6/6): 548a0dcd865c16a50980420ddfa5fbccb8b59621179798e6dc905c9bf8af3b34-kubernetes-cni-0.7.5-0.x86_64.rpm | 10 MB 00:02:16
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 287 kB/s | 57 MB 00:03:22
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : socat-1.7.3.2-2.el7.x86_64 1/6
Installing : kubernetes-cni-0.7.5-0.x86_64 2/6
Installing : kubelet-1.14.0-0.x86_64 3/6
Installing : kubectl-1.14.0-0.x86_64 4/6
Installing : cri-tools-1.13.0-0.x86_64 5/6
Installing : kubeadm-1.14.0-0.x86_64 6/6
Verifying : kubelet-1.14.0-0.x86_64 1/6
Verifying : kubeadm-1.14.0-0.x86_64 2/6
Verifying : cri-tools-1.13.0-0.x86_64 3/6
Verifying : kubectl-1.14.0-0.x86_64 4/6
Verifying : kubernetes-cni-0.7.5-0.x86_64 5/6
Verifying : socat-1.7.3.2-2.el7.x86_64 6/6
Installed:
kubeadm.x86_64 0:1.14.0-0 kubectl.x86_64 0:1.14.0-0 kubelet.x86_64 0:1.14.0-0
Dependency Installed:
cri-tools.x86_64 0:1.13.0-0 kubernetes-cni.x86_64 0:0.7.5-0 socat.x86_64 0:1.7.3.2-2.el7
Complete!
[root@manager-node ~]#
-----------------------------------
docker和k8s设置同一个cgroup
[root@worker01-node ~]# vi /etc/docker/daemon.json
内容如下
{
"exec-opts": ["native.cgroupdriver=systemd"]
}
重启docker
[root@worker01-node ~]# systemctl restart docker
kubelet设置 下面出现No such file or directory 是正常的
[root@manager-node ~]# sed -i "s/cgroup-driver=systemd/cgroup-driver=cgroupfs/g" /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
sed: can't read /etc/systemd/system/kubelet.service.d/10-kubeadm.conf: No such file or directory
[root@manager-node ~]#
-----------------------------------
设置开启启动kubelete
[root@manager-node ~]# systemctl enable kubelet && systemctl start kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@manager-node ~]#
[root@manager-node ~]
-----------------------------------
拉取pull镜像并推送push到自己的仓库中
[root@manager-node ~]# kubeadm config images list
I1229 08:30:24.617466 4852 version.go:96] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.txt": Get https://dl.k8s.io/release/stable-1.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I1229 08:30:24.617556 4852 version.go:97] falling back to the local client version: v1.14.0
k8s.gcr.io/kube-apiserver:v1.14.0
k8s.gcr.io/kube-controller-manager:v1.14.0
k8s.gcr.io/kube-scheduler:v1.14.0
k8s.gcr.io/kube-proxy:v1.14.0
k8s.gcr.io/pause:3.1
k8s.gcr.io/etcd:3.3.10
k8s.gcr.io/coredns:1.3.1
[root@manager-node ~]#
-----------------------------------
拉取镜像
设置执行的脚本
#!/bin/bash
set -e
KUBE_VERSION=v1.14.0
KUBE_PAUSE_VERSION=3.1
ETCD_VERSION=3.3.10
CORE_DNS_VERSION=1.3.1
GCR_URL=k8s.gcr.io
ALIYUN_URL=registry.cn-hangzhou.aliyuncs.com/google_containers
images=(kube-proxy:${KUBE_VERSION}
kube-scheduler:${KUBE_VERSION}
kube-controller-manager:${KUBE_VERSION}
kube-apiserver:${KUBE_VERSION}
pause:${KUBE_PAUSE_VERSION}
etcd:${ETCD_VERSION}
coredns:${CORE_DNS_VERSION})
for imageName in ${images[@]} ; do
docker pull $ALIYUN_URL/$imageName
docker tag $ALIYUN_URL/$imageName $GCR_URL/$imageName
docker rmi $ALIYUN_URL/$imageName
done
-----------------------------------
执行上面的脚本
[root@manager-node kubeadm]# sh kubeadm.sh
v1.14.0: Pulling from google_containers/kube-proxy
346aee5ea5bc: Pull complete
1e695dec1fee: Pull complete
9ce77f082c19: Pull complete
Digest: sha256:a704064100b363856afa4cee160a51948b9ac49bbc34ba97caeb7928055e9de1
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy@sha256:a704064100b363856afa4cee160a51948b9ac49bbc34ba97caeb7928055e9de1
v1.14.0: Pulling from google_containers/kube-scheduler
346aee5ea5bc: Already exists
25d09f49ddd0: Pull complete
Digest: sha256:0484d3f811282a124e60a48de8f19f91913bac4d0ba0805d2ed259ea3b691a5e
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler@sha256:0484d3f811282a124e60a48de8f19f91913bac4d0ba0805d2ed259ea3b691a5e
v1.14.0: Pulling from google_containers/kube-controller-manager
346aee5ea5bc: Already exists
fb9302cbe084: Pull complete
Digest: sha256:09c62c11cdfe8dc43e0314174271ca434329c7991d6db5ef7c41a95da399cbf8
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager@sha256:09c62c11cdfe8dc43e0314174271ca434329c7991d6db5ef7c41a95da399cbf8
v1.14.0: Pulling from google_containers/kube-apiserver
346aee5ea5bc: Already exists
a1448280d5df: Pull complete
Digest: sha256:ebfb9018e345697e85d7adc4664c9340570bca33fff126e158264a791c6a5708
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver@sha256:ebfb9018e345697e85d7adc4664c9340570bca33fff126e158264a791c6a5708
3.1: Pulling from google_containers/pause
cf9202429979: Pull complete
Digest: sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/pause@sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca
3.3.10: Pulling from google_containers/etcd
90e01955edcd: Pull complete
6369547c492e: Pull complete
bd2b173236d3: Pull complete
Digest: sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/etcd:3.3.10
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/etcd@sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb
1.3.1: Pulling from google_containers/coredns
e0daa8927b68: Pull complete
3928e47de029: Pull complete
Digest: sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b
Status: Downloaded newer image for registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/google_containers/coredns@sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b
[root@manager-node kubeadm]#
-----------------------------------
推送镜像到自己的仓库（这个只需要一台机器上执行即可）
首先登录仓库(我这里用的是阿里云的仓库)
[root@manager-node kubeadm]# docker login --username=高新富20180421 registry.cn-hangzhou.aliyuncs.com
Password:
WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store
Login Succeeded
[root@manager-node kubeadm]#
-----------------------------------
开始推送
制作推送的脚本 kubeadm-push-aliyun.sh
#!/bin/bash
set -e
KUBE_VERSION=v1.14.0
KUBE_PAUSE_VERSION=3.1
ETCD_VERSION=3.3.10
CORE_DNS_VERSION=1.3.1
GCR_URL=k8s.gcr.io
ALIYUN_URL=registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo
images=(kube-proxy:${KUBE_VERSION}
kube-scheduler:${KUBE_VERSION}
kube-controller-manager:${KUBE_VERSION}
kube-apiserver:${KUBE_VERSION}
pause:${KUBE_PAUSE_VERSION}
etcd:${ETCD_VERSION}
coredns:${CORE_DNS_VERSION})
for imageName in ${images[@]} ; do
docker tag $GCR_URL/$imageName $ALIYUN_URL/$imageName
docker push $ALIYUN_URL/$imageName
docker rmi $ALIYUN_URL/$imageName
done
-----------------------------------
ALIYUN_URL=registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo
这里我是将镜像推送到我自己的阿里云命名空间gaoxinfu-demo下面
执行脚本 kubeadm-push-aliyun.sh
[root@manager-node kubeadm]# sh kubeadm-push-aliyun.sh
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/kube-proxy]
49ffb7ee5526: Preparing
0b8d2e946c93: Preparing
5ba3be777c2d: Preparing
denied: requested access to the resource is denied
[root@worker01-node kubeadm]# vi kubeadm-push-aliyun.sh
[root@worker01-node kubeadm]# sh kubeadm-push-aliyun.sh
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-proxy]
49ffb7ee5526: Pushed
0b8d2e946c93: Pushed
5ba3be777c2d: Pushed
v1.14.0: digest: sha256:a704064100b363856afa4cee160a51948b9ac49bbc34ba97caeb7928055e9de1 size: 951
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-proxy:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-proxy@sha256:a704064100b363856afa4cee160a51948b9ac49bbc34ba97caeb7928055e9de1
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-scheduler]
f46bd0cdf014: Mounted from google_containers/kube-scheduler
5ba3be777c2d: Mounted from gaoxinfu-demo/kube-proxy
v1.14.0: digest: sha256:0484d3f811282a124e60a48de8f19f91913bac4d0ba0805d2ed259ea3b691a5e size: 741
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-scheduler:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-scheduler@sha256:0484d3f811282a124e60a48de8f19f91913bac4d0ba0805d2ed259ea3b691a5e
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-controller-manager]
e54a9b2ca97a: Mounted from google_containers/kube-controller-manager
5ba3be777c2d: Mounted from gaoxinfu-demo/kube-scheduler
v1.14.0: digest: sha256:09c62c11cdfe8dc43e0314174271ca434329c7991d6db5ef7c41a95da399cbf8 size: 741
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-controller-manager:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-controller-manager@sha256:09c62c11cdfe8dc43e0314174271ca434329c7991d6db5ef7c41a95da399cbf8
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-apiserver]
ed0630bf1e64: Mounted from google_containers/kube-apiserver
5ba3be777c2d: Mounted from gaoxinfu-demo/kube-controller-manager
v1.14.0: digest: sha256:ebfb9018e345697e85d7adc4664c9340570bca33fff126e158264a791c6a5708 size: 741
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-apiserver:v1.14.0
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/kube-apiserver@sha256:ebfb9018e345697e85d7adc4664c9340570bca33fff126e158264a791c6a5708
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/pause]
e17133b79956: Mounted from google_containers/pause
3.1: digest: sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca size: 527
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/pause:3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/pause@sha256:759c3f0f6493093a9043cc813092290af69029699ade0e3dbe024e968fcb7cca
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/etcd]
6fbfb277289f: Mounted from google_containers/etcd
30796113fb51: Mounted from google_containers/etcd
8a788232037e: Mounted from google_containers/etcd
3.3.10: digest: sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb size: 950
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/etcd:3.3.10
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/etcd@sha256:240bd81c2f54873804363665c5d1a9b8e06ec5c63cfc181e026ddec1d81585bb
The push refers to repository [registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/coredns]
c6a5fc8a3f01: Mounted from google_containers/coredns
fb61a074724d: Mounted from google_containers/coredns
1.3.1: digest: sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b size: 739
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/coredns:1.3.1
Untagged: registry.cn-hangzhou.aliyuncs.com/gaoxinfu-demo/coredns@sha256:638adb0319813f2479ba3642bbe37136db8cf363b48fb3eb7dc8db634d8d5a5b
[root@worker01-node kubeadm]#
-----------------------------------
执行完成，可以看一下自己的阿里云的镜像仓库是否有这几个镜像了
kubeadm init初始化master节点
kubeadm reset 还原
这个主要是假如你初始化了想还原或者放弃，重新搭建，可以用此命令
[root@manager-node ~]# kubeadm reset
[reset] WARNING: Changes made to this host by 'kubeadm init' or 'kubeadm join' will be reverted.
[reset] Are you sure you want to proceed? [y/N]: y
[preflight] Running pre-flight checks
W1229 09:23:34.757252 7056 reset.go:234] [reset] No kubeadm config, using etcd pod spec to get data directory
[reset] No etcd config found. Assuming external etcd
[reset] Please manually reset etcd to prevent further issues
[reset] Stopping the kubelet service
[reset] unmounting mounted directories in "/var/lib/kubelet"
[reset] Deleting contents of stateful directories: [/var/lib/kubelet /etc/cni/net.d /var/lib/dockershim /var/run/kubernetes]
[reset] Deleting contents of config directories: [/etc/kubernetes/manifests /etc/kubernetes/pki]
[reset] Deleting files: [/etc/kubernetes/admin.conf /etc/kubernetes/kubelet.conf /etc/kubernetes/bootstrap-kubelet.conf /etc/kubernetes/controller-manager.conf /etc/kubernetes/scheduler.conf]
The reset process does not reset or clean up iptables rules or IPVS tables.
If you wish to reset iptables, you must do so manually.
For example:
iptables -F && iptables -t nat -F && iptables -t mangle -F && iptables -X
If your cluster was setup to utilize IPVS, run ipvsadm --clear (or similar)
to reset your system's IPVS tables.
[root@manager-node ~]#
-----------------------------------
kubeadm init 初始化
kubeadm init --kubernetes-version=1.14.0 --apiserver-advertise-address=192.168.1.111 --pod-network-cidr=10.244.0.0/16
参数说明
1.--apiserver-advertise-address=192.168.1.111 这里的ip 实际就是master节点的内网ip，我这里manager-node节点是192.168.1.111
执行样例
[root@manager-node ~]# kubeadm init --kubernetes-version=1.14.0 --apiserver-advertise-address=192.168.1.111 --pod-network-cidr=10.244.0.0/16
[init] Using Kubernetes version: v1.14.0
[preflight] Running pre-flight checks
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Activating the kubelet service
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Generating "front-proxy-ca" certificate and key
[certs] Generating "front-proxy-client" certificate and key
[certs] Generating "ca" certificate and key
[certs] Generating "apiserver" certificate and key
[certs] apiserver serving cert is signed for DNS names [manager-node kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.1.111]
[certs] Generating "apiserver-kubelet-client" certificate and key
[certs] Generating "etcd/ca" certificate and key
[certs] Generating "etcd/healthcheck-client" certificate and key
[certs] Generating "apiserver-etcd-client" certificate and key
[certs] Generating "etcd/server" certificate and key
[certs] etcd/server serving cert is signed for DNS names [manager-node localhost] and IPs [192.168.1.111 127.0.0.1 ::1]
[certs] Generating "etcd/peer" certificate and key
[certs] etcd/peer serving cert is signed for DNS names [manager-node localhost] and IPs [192.168.1.111 127.0.0.1 ::1]
[certs] Generating "sa" key and public key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Writing "admin.conf" kubeconfig file
[kubeconfig] Writing "kubelet.conf" kubeconfig file
[kubeconfig] Writing "controller-manager.conf" kubeconfig file
[kubeconfig] Writing "scheduler.conf" kubeconfig file
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 15.506013 seconds
[upload-config] storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.14" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --experimental-upload-certs
[mark-control-plane] Marking the node manager-node as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node manager-node as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: 3wgo6s.s8gm0tum1vy4a89f
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
Your Kubernetes control-plane has initialized successfully!
To start using your cluster, you need to run the following as a regular user:
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Then you can join any number of worker nodes by running the following on each as root:
kubeadm join 192.168.1.111:6443 --token 3wgo6s.s8gm0tum1vy4a89f \
--discovery-token-ca-cert-hash sha256:f2b7372e6745ac4e4b121b76e594b6c172730e9d76043fd307909e525c58cb9a
[root@manager-node ~]#
-----------------------------------
备注
1.保存好最后一个执行的命令：(因此待会worker节点搭建集群的时候，需要跟主节点进行集群搭建)
kubeadm join 192.168.1.111:6443 --token 3wgo6s.s8gm0tum1vy4a89f \
--discovery-token-ca-cert-hash sha256:f2b7372e6745ac4e4b121b76e594b6c172730e9d76043fd307909e525c58cb9a
-----------------------------------
根据上面init的提示，在master节点上执行下面的命令
[root@manager-node ~]# mkdir -p $HOME/.kube
[root@manager-node ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@manager-node ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config
[root@manager-node ~]#
-----------------------------------
验证是否安装成功
[root@manager-node ~]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
coredns-fb8b8dccf-6hvcz 0/1 Pending 0 9m8s
coredns-fb8b8dccf-x8xxc 0/1 Pending 0 9m8s
etcd-manager-node 1/1 Running 0 8m30s
kube-apiserver-manager-node 1/1 Running 0 8m12s
kube-controller-manager-manager-node 1/1 Running 0 8m21s
kube-proxy-rvddm 1/1 Running 0 9m9s
kube-scheduler-manager-node 1/1 Running 0 8m2s
[root@manager-node ~]#
-----------------------------------
备注
1.通过上面命令查看我们可以看到 etc，controller，scheduler等组件都以pod的方式安装成功了；
2.这里注意 coredns没有启动，需要安装网络插件(参考下面的calico网络插件安装)
健康健康校验
[root@manager-node ~]# curl -k https://localhost:6443/healthz
ok[root@manager-node ~]#
部署calico网络插件
网络插件方式地址
https://kubernetes.io/docs/concepts/cluster-administration/addons/
Calico安装
Calico官网
https://docs.projectcalico.org/v3.9/getting-started/kubernetes/
[root@manager-node ~]# kubectl apply -f https://docs.projectcalico.org/v3.9/manifests/calico.yaml
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
clusterrole.rbac.authorization.k8s.io/calico-node created
clusterrolebinding.rbac.authorization.k8s.io/calico-node created
daemonset.apps/calico-node created
serviceaccount/calico-node created
deployment.apps/calico-kube-controllers created
serviceaccount/calico-kube-controllers created
[root@manager-node ~]#
-----------------------------------
kubectl get pods [查看是否安装成功]
kubectl get pods --all-namespaces -w [查看所有的pod]
kubectl get pods --all-namespaces -w
[root@manager-node ~]# kubectl get pods --all-namespaces -w
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system calico-kube-controllers-594b6978c5-7lxqz 1/1 Running 1 14h
kube-system calico-node-82rx7 1/1 Running 1 14h
kube-system coredns-fb8b8dccf-6hvcz 1/1 Running 1 14h
kube-system coredns-fb8b8dccf-x8xxc 1/1 Running 1 14h
kube-system etcd-manager-node 1/1 Running 1 14h
kube-system kube-apiserver-manager-node 1/1 Running 1 14h
kube-system kube-controller-manager-manager-node 1/1 Running 1 14h
kube-system kube-proxy-rvddm 1/1 Running 1 14h
kube-system kube-scheduler-manager-node
-----------------------------------
kubectl get pods -n kube-system [查看k8s系统级别的pod]
[root@manager-node demo]# kubectl get pods -n kube-system
NAME READY STATUS RESTARTS AGE
calico-kube-controllers-594b6978c5-7lxqz 1/1 Running 1 16h
calico-node-82rx7 1/1 Running 1 16h
calico-node-xrqf8 1/1 Running 0 104m
calico-node-z86gh 1/1 Running 0 104m
coredns-fb8b8dccf-6hvcz 1/1 Running 1 16h
coredns-fb8b8dccf-x8xxc 1/1 Running 1 16h
etcd-manager-node 1/1 Running 1 16h
kube-apiserver-manager-node 1/1 Running 1 16h
kube-controller-manager-manager-node 1/1 Running 2 16h
kube-proxy-5q9b5 1/1 Running 0 104m
kube-proxy-pw6r7 1/1 Running 0 104m
kube-proxy-rvddm 1/1 Running 1 16h
kube-scheduler-manager-node 1/1 Running 3 16h
[root@manager-node demo]#
-----------------------------------
kube join [worker节点关联集群]
下面的命令是初始化kubeadm init成功 提示的需要在子节点上执行的命令
kubeadm join 192.168.1.111:6443 --token 3wgo6s.s8gm0tum1vy4a89f \
--discovery-token-ca-cert-hash sha256:f2b7372e6745ac4e4b121b76e594b6c172730e9d76043fd307909e525c58cb9a
在worker01-node节点上执行
[root@worker01-node ~]# kubeadm join 192.168.1.111:6443 --token 3wgo6s.s8gm0tum1vy4a89f \
> --discovery-token-ca-cert-hash sha256:f2b7372e6745ac4e4b121b76e594b6c172730e9d76043fd307909e525c58cb9a
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Activating the kubelet service
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
[root@worker01-node ~]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@worker01-node ~]#
-----------------------------------
在worker02-node节点上执行
[root@worker02-node ~]# kubeadm join 192.168.1.111:6443 --token 3wgo6s.s8gm0tum1vy4a89f \
> --discovery-token-ca-cert-hash sha256:f2b7372e6745ac4e4b121b76e594b6c172730e9d76043fd307909e525c58cb9a
[preflight] Running pre-flight checks
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Activating the kubelet service
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
[root@worker02-node ~]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@worker02-node ~]#
-----------------------------------
在Manager-node(master主节点)上查看是否已经有子节点
kubectl get nodes [查看]
[root@manager-node ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
manager-node Ready master 15h v1.14.0
worker01-node Ready <none> 87s v1.14.0
worker02-node NotReady <none> 83s v1.14.0
[root@manager-node ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
manager-node Ready master 15h v1.14.0
worker01-node Ready <none> 5m21s v1.14.0
worker02-node Ready <none> 5m17s v1.14.0
[root@manager-node ~]#
-----------------------------------
如下
1.从NotRedeay变为Ready，集群中已经有三个节点；
kubectl get pods -o wide [展示详情查看]
[root@manager-node demo]# kubectl get pods -o wide
至此,集群搭建完成
案例：使用集群搭建nginx pod
Manager-Node节点上创建demo文件夹
[root@manager-node ~]# pwd
/root
[root@manager-node ~]# mkdir demo
创建Nginx pod 配置文件
创建脚本
cat > pod_nginx_kubeadm.yaml <<EOF
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: nginx
labels:
tier: frontend
spec:
replicas: 3
selector:
matchLabels:
tier: frontend
template:
metadata:
name: nginx
labels:
tier: frontend
spec:
containers:
- name: nginx
image: nginx
ports:
- containerPort: 80
-----------------------------------
执行样例
[root@manager-node demo]# cat > pod_nginx_kubeadm.yaml <<EOF
> apiVersion: apps/v1
> kind: ReplicaSet
> metadata:
> name: nginx
> labels:
> tier: frontend
> spec:
> replicas: 3
> selector:
> matchLabels:
> tier: frontend
> template:
> metadata:
> name: nginx
> labels:
> tier: frontend
> spec:
> containers:
> - name: nginx
> image: nginx
> ports:
> - containerPort: 80
> EOF
[root@manager-node demo]# ls -la
total 4
drwxr-xr-x. 2 root root 36 Jan 2 04:25 .
dr-xr-x---. 7 root root 243 Jan 2 04:24 ..
-rw-r--r--. 1 root root 353 Jan 2 04:25 pod_nginx_kubeadm.yaml
[root@manager-node demo]#
-----------------------------------
kubectl apply -f pod_nginx_kubeadm.yaml [启动]
[root@manager-node demo]# kubectl apply -f pod_nginx_kubeadm.yaml
replicaset.apps/nginx created
[root@manager-node demo]#
kubectl get pods 查看
kubectl get pods # 显示当前状态
kubectl get pods -w # 实时查看显示状态
kubectl describe pod nginx
[root@manager-node demo]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-9t4qw 0/1 ContainerCreating 0 34s
nginx-h49g8 0/1 ContainerCreating 0 34s
nginx-v6njt 0/1 ContainerCreating 0 34s
-----------------------------------
kubectl get pods [查看pod]
可以发现上面的状态是ContainerCreating，过段时间会变为Running
[root@manager-node demo]# kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-9t4qw 1/1 Running 0 9m2s
nginx-h49g8 1/1 Running 0 9m2s
nginx-v6njt 1/1 Running 0 9m2s
[root@manager-node demo]#
-----------------------------------
kubectl get pods -o wide [查看pod详情]
[root@manager-node ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-9t4qw 1/1 Running 1 91m 192.168.101.6 worker01-node <none> <none>
nginx-cmktg 1/1 Running 1 30m 192.168.101.5 worker01-node <none> <none>
nginx-t75nq 1/1 Running 1 30m 192.168.101.4 worker01-node <none> <none>
[root@manager-node ~]#
-----------------------------------
1.我们可以看到 我们在master节点上执行创建三个pod之后，
创建的三个节点随机的都到worker01-node节点上，并且三个pod，都有的自己的ip
2.这里注意下，pod或者容器的ip创建都是通过我们上传安装的Calico组件创建的；
3.上面的192.168.101.6，192.168.101.5，192.168.101.4
验证nginx pod安装
[root@manager-node ~]#
[root@manager-node ~]# curl 192.168.101.6:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
width: 35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@manager-node ~]#
-----------------------------------
[root@manager-node ~]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
nginx-9t4qw 1/1 Running 1 104m 192.168.101.6 worker01-node <none> <none>
nginx-cmktg 1/1 Running 1 44m 192.168.101.5 worker01-node <none> <none>
nginx-t75nq 1/1 Running 1 44m 192.168.101.4 worker01-node <none> <none>
[root@manager-node ~]# kubectl describe pod nginx-9t4qw
## 见下面的截图
-----------------------------------
删除pod kubectl delete -f pod_nginx_rs.yaml
kubectl delete -f pod_nginx_kubeadm.yaml
kubeadm init步骤说明
/*
01-进行一系列检查，以确定这台机器可以部署kubernetes
02-生成kubernetes对外提供服务所需要的各种证书可对应目录
/etc/kubernetes/pki/*
03-为其他组件生成访问kube-ApiServer所需的配置文件
ls /etc/kubernetes/
admin.conf controller-manager.conf kubelet.conf scheduler.conf
04-为 Master组件生成Pod配置文件。
ls /etc/kubernetes/manifests/*.yaml
kube-apiserver.yaml
kube-controller-manager.yaml
kube-scheduler.yaml
05-生成etcd的Pod YAML文件。
ls /etc/kubernetes/manifests/*.yaml
kube-apiserver.yaml
kube-controller-manager.yaml
kube-scheduler.yaml
etcd.yaml
06-一旦这些 YAML 文件出现在被 kubelet 监视的/etc/kubernetes/manifests/目录下，kubelet就会自动创建这些yaml文件定义的pod，即master组件的容器。master容器启动后，kubeadm会通过检查localhost：6443/healthz这个master组件的健康状态检查URL，等待master组件完全运行起来
07-为集群生成一个bootstrap token
08-将ca.crt等 Master节点的重要信息，通过ConfigMap的方式保存在etcd中，工后续部署node节点使用
09-最后一步是安装默认插件，kubernetes默认kube-proxy和DNS两个插件是必须安装的
-----------------------------------
