227 lines
5.8 KiB
Markdown
227 lines
5.8 KiB
Markdown
<h1><center>基于kubeadm部署kubernetes集群</center></h1>
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著作：行癫 <盗版必究>
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------
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## 一：环境准备
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三台服务器，一台master，两台node,master节点必须是2核cpu
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| 节点名称 | IP地址 |
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| :------: | :--------: |
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| master | 10.0.0.220 |
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| node-1 | 10.0.0.221 |
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| node-2 | 10.0.0.222 |
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| node-3 | 10.0.0.223 |
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#### 1.所有服务器关闭防火墙和selinux
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```shell
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[root@localhost ~]# systemctl stop firewalld
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[root@localhost ~]# systemctl disable firewalld
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[root@localhost ~]# setenforce 0
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[root@localhost ~]# sed -i '/^SELINUX=/c SELINUX=disabled/' /etc/selinux/config
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[root@localhost ~]# swapoff -a 临时关闭
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[root@localhost ~]# sed -i 's/.*swap.*/#&/' /etc/fstab 永久关闭
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注意：
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关闭所有服务器的交换分区
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所有节点操作
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```
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#### 2.保证yum仓库可用
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```shell
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[root@localhost ~]# yum clean all
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[root@localhost ~]# yum makecache fast
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注意：
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使用国内yum源
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所有节点操作
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```
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#### 3.修改主机名
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```shell
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[root@localhost ~]# hostnamectl set-hostname master
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[root@localhost ~]# hostnamectl set-hostname node-1
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[root@localhost ~]# hostnamectl set-hostname node-2
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[root@localhost ~]# hostnamectl set-hostname node-3
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注意：
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所有节点操作
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```
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#### 4.添加本地解析
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```shell
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[root@master ~]# cat >> /etc/hosts <<eof
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10.0.0.220 master
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10.0.0.221 node-1
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10.0.0.222 node-2
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10.0.0.223 node-3
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eof
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注意：
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所有节点操作
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```
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#### 5.安装容器
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```shell
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[root@master ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
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[root@master ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
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[root@master ~]# yum -y install docker-ce
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[root@master ~]# systemctl start docker
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[root@master ~]# systemctl enable docker
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[root@master ~]# vim /etc/docker/daemon.json
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{
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"exec-opts": ["native.cgroupdriver=systemd"]
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}
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[root@master ~]# systemctl restart docker
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[kubelet-check] The HTTP call equal to ‘curl -sSL http://localhost:10248/healthz’ failed with error: Get “http://localhost:10248/healthz”: dial tcp [::1]:10248: connect: connection refused.
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[kubelet-check] It seems like the kubelet isn’t running or healthy.
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注意：
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所有节点操作
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```
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#### 6.安装kubeadm和kubelet
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```shell
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[root@master ~]# cat >> /etc/yum.repos.d/kubernetes.repo <<eof
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[kubernetes]
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name=Kubernetes
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baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
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enabled=1
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gpgcheck=0
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repo_gpgcheck=0
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gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
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eof
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[root@master ~]# yum -y install kubeadm kubelet kubectl ipvsadm
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注意：
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所有节点操作
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这里安装的是最新版本（也可以指定版本号：kubeadm-1.19.4）
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```
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#### 7.配置kubelet的cgroups
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```shell
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[root@master ~]# cat >/etc/sysconfig/kubelet<<EOF
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KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
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EOF
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k8s.gcr.io/pause:3.6
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```
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#### 8.加载内核模块
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```shell
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[root@master ~]# modprobe br_netfilter
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注意：
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所有节点操作
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```
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#### 9.修改内核参数
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```shell
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[root@master ~]# cat >> /etc/sysctl.conf <<eof
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net.bridge.bridge-nf-call-ip6tables = 1
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net.bridge.bridge-nf-call-iptables = 1
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vm.swappiness=0
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eof
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[root@master ~]# sysctl -p
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net.bridge.bridge-nf-call-ip6tables = 1
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net.bridge.bridge-nf-call-iptables = 1
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vm.swappiness = 0
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注意：
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所有节点操作
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```
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## 二：部署Kubernetes
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#### 1.镜像下载
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```shell
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https://www.xingdiancloud.cn/index.php/s/6GyinxZwSRemHPz
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注意：
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下载后上传到所有节点
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```
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#### 2.镜像导入
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```shell
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[root@master ~]# cat image_load.sh
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#!/bin/bash
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image_path=`pwd`
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for i in `ls "${image_path}" | grep tar`
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do
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docker load < $i
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done
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[root@master ~]# bash image_load.sh
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注意：
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所有节点操作
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```
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#### 3.master节点初始化
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```shell
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[root@master ~]# kubeadm init --kubernetes-version=1.23.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=10.0.0.220
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Your Kubernetes control-plane has initialized successfully!
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To start using your cluster, you need to run the following as a regular user:
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mkdir -p $HOME/.kube
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sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
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sudo chown $(id -u):$(id -g) $HOME/.kube/config
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Alternatively, if you are the root user, you can run:
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export KUBECONFIG=/etc/kubernetes/admin.conf
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You should now deploy a pod network to the cluster.
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Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
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https://kubernetes.io/docs/concepts/cluster-administration/addons/
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Then you can join any number of worker nodes by running the following on each as root:
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kubeadm join 10.0.0.220:6443 --token mzrm3c.u9mpt80rddmjvd3g \
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--discovery-token-ca-cert-hash sha256:fec53dfeacc5187d3f0e3998d65bd3e303fa64acd5156192240728567659bf4a
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```
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#### 4.安装pod插件
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```shell
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[root@master ~]# wget http://www.xingdiancloud.cn:92/index.php/s/3Ad7aTxqPPja24M/download/flannel.yaml
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[root@master ~]# kubectl create -f flannel.yaml
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```
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#### 5.将node加入工作节点
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```shell
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[root@node-1 ~]# kubeadm join 10.0.0.220:6443 --token mzrm3c.u9mpt80rddmjvd3g --discovery-token-ca-cert-hash sha256:fec53dfeacc5187d3f0e3998d65bd3e303fa64acd5156192240728567659bf4a
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注意：
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这里使用的是master初始化产生的token
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这里的token时间长了会改变，需要使用命令获取，见下期内容
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没有记录集群 join 命令的可以通过以下方式重新获取:
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kubeadm token create --print-join-command --ttl=0
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```
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#### 6.master节点查看集群状态
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```shell
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[root@master ~]# kubectl get nodes
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NAME STATUS ROLES AGE VERSION
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master Ready control-plane,master 26m v1.23.1
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node-1 Ready <none> 4m45s v1.23.1
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node-2 Ready <none> 4m40s v1.23.1
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node-3 Ready <none> 4m46s v1.23.1
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```
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