kubernetes/kubernetes-MD/基于kubeadm部署kubernetes集群.md

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<h1><center>基于kubeadm部署kubernetes集群</center></h1>
著作:行癫 <盗版必究>
------
## 一:环境准备
三台服务器一台master两台node,master节点必须是2核cpu
| 节点名称 | IP地址 |
| :------: | :--------: |
| master | 10.0.0.220 |
| node-1 | 10.0.0.221 |
| node-2 | 10.0.0.222 |
| node-3 | 10.0.0.223 |
#### 1.所有服务器关闭防火墙和selinux
```shell
[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# systemctl disable firewalld
[root@localhost ~]# setenforce 0
[root@localhost ~]# sed -i '/^SELINUX=/c SELINUX=disabled/' /etc/selinux/config
[root@localhost ~]# swapoff -a  临时关闭
[root@localhost ~]# sed -i 's/.*swap.*/#&/' /etc/fstab 永久关闭
注意:
关闭所有服务器的交换分区
所有节点操作
```
#### 2.保证yum仓库可用
```shell
[root@localhost ~]# yum clean all
[root@localhost ~]# yum makecache fast
注意:
使用国内yum源
所有节点操作
```
#### 3.修改主机名
```shell
[root@localhost ~]# hostnamectl set-hostname master
[root@localhost ~]# hostnamectl set-hostname node-1
[root@localhost ~]# hostnamectl set-hostname node-2
[root@localhost ~]# hostnamectl set-hostname node-3
注意:
所有节点操作
```
#### 4.添加本地解析
```shell
[root@master ~]# cat >> /etc/hosts <<eof
10.0.0.220 master
10.0.0.221 node-1
10.0.0.222 node-2
10.0.0.223 node-3
eof
注意:
所有节点操作
```
#### 5.安装容器
```shell
[root@master ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
[root@master ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
[root@master ~]# yum -y install docker-ce
[root@master ~]# systemctl start docker
[root@master ~]# systemctl enable docker
注意:
所有节点操作
```
#### 6.安装kubeadm和kubelet
```shell
[root@master ~]# cat >> /etc/yum.repos.d/kubernetes.repo <<eof
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
eof
[root@master ~]# yum -y install kubeadm kubelet kubectl ipvsadm
注意:
所有节点操作
这里安装的是最新版本也可以指定版本号kubeadm-1.19.4
```
#### 7.配置kubelet的cgroups
```shell
[root@master ~]# cat >/etc/sysconfig/kubelet<<EOF
KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
EOF
k8s.gcr.io/pause:3.6
```
#### 8.加载内核模块
```shell
[root@master ~]# modprobe br_netfilter
注意:
所有节点操作
```
#### 9.修改内核参数
```shell
[root@master ~]# cat >> /etc/sysctl.conf <<eof
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness=0
eof
[root@master ~]# sysctl -p
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
vm.swappiness = 0
注意:
所有节点操作
```
## 二部署Kubernetes
#### 1.镜像下载
```shell
https://www.xingdiancloud.cn/index.php/s/6GyinxZwSRemHPz
注意:
下载后上传到所有节点
```
#### 2.镜像导入
```shell
[root@master ~]# cat image_load.sh
#!/bin/bash
image_path=`pwd`
for i in `ls "${image_path}" | grep tar`
do
docker load < $i
done
[root@master ~]# bash image_load.sh
注意:
所有节点操作
```
#### 3.master节点初始化
```shell
[root@master ~]# kubeadm init --kubernetes-version=1.23.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.0.0.220
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
Alternatively, if you are the root user, you can run:
export KUBECONFIG=/etc/kubernetes/admin.conf
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 10.0.0.220:6443 --token mzrm3c.u9mpt80rddmjvd3g \
--discovery-token-ca-cert-hash sha256:fec53dfeacc5187d3f0e3998d65bd3e303fa64acd5156192240728567659bf4a
```
#### 4.安装pod插件
```shell
[root@master ~]# wget http://www.xingdiancloud.cn:92/index.php/s/3Ad7aTxqPPja24M/download/flannel.yaml
[root@master ~]# kubectl create -f flannel.yaml
```
#### 5.将node加入工作节点
```shell
[root@node-1 ~]# kubeadm join 10.0.0.220:6443 --token mzrm3c.u9mpt80rddmjvd3g --discovery-token-ca-cert-hash sha256:fec53dfeacc5187d3f0e3998d65bd3e303fa64acd5156192240728567659bf4a
注意:
这里使用的是master初始化产生的token
这里的token时间长了会改变需要使用命令获取见下期内容
没有记录集群 join 命令的可以通过以下方式重新获取:
kubeadm token create --print-join-command --ttl=0
```
#### 6.master节点查看集群状态
```shell
[root@master ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready control-plane,master 26m v1.23.1
node-1 Ready <none> 4m45s v1.23.1
node-2 Ready <none> 4m40s v1.23.1
node-3 Ready <none> 4m46s v1.23.1
```