快速搭建K8s集群一键安装脚本及配置说明

基础安装脚本，每台机器上执行

#!/bin/bash   echo "1、修改DNS配置如有需要" chattr -i /etc/resolv.conf cat <<EOF >>  /etc/resolv.conf  nameserver 10.139.0.246 nameserver 10.139.0.247 EOF   echo "清理一些无用的yum repos" mkdir -p  /etc/yum.repos.d/back && mv /etc/yum.repos.d/ambari*   /etc/yum.repos.d/hdp*   /etc/yum.repos.d/back   yum clean all  ### 关闭swap分区 echo "swapoff ## 临时生效" swapoff -a  ## 永久生效可以编辑/etc/fstab文件 注释掉swap那行  echo "关闭防火墙" systemctl stop firewalld systemctl disable --now firewalld  echo "关闭sselinux" setenforce 0 sed -i 's/enforcing/disabled/' /etc/selinux/config    # 内核开启IPv4转发需要开启下面的模块 modprobe br_netfilter  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 EOF    echo "设置docker的目录软连接 /var/lib/docker把docker存储设置到数据盘上" mkdir -p /data1/docker  ln -s /data1/docker  /var/lib    echo "安装docker 依赖 " yum install yum-utils device-mapper-persistent-data lvm2 -y     ### 新增 Docker 仓库。  yum-config-manager   --add-repo   https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo   yum clean all  ## 安装 Docker CE. yum update -y && yum install -y    containerd.io-1.2.13    docker-ce-19.03.11    docker-ce-cli-19.03.11    ## 创建 /etc/docker 目录。 mkdir /etc/docker    cat > /etc/docker/daemon.json <<EOF {   "exec-opts": ["native.cgroupdriver=systemd"],   "log-driver": "json-file",   "log-opts": {     "max-size": "100m"   },   "storage-driver": "overlay2",   "storage-opts": [     "overlay2.override_kernel_check=true"   ],   "registry-mirrors": [ "https://1nj0zren.mirror.aliyuncs.com", "https://docker.mirrors.ustc.edu.cn", "http://f1361db2.m.daocloud.io", "https://registry.docker-cn.com" ] } EOF  sleep 1   systemctl daemon-reload systemctl restart docker sudo systemctl enable docker      cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg exclude=kube* EOF    yum install -y kubelet-1.19.3 kubeadm-1.19.3 kubectl-1.19.3 --disableexcludes=kubernetes  sleep 1  kubeadm version  systemctl enable kubelet systemctl daemon-reload systemctl restart kubelet 

master节点操作

master节点使用kubeadm命令初始化集群

• 生成集群初始化YAML配置文件

kubeadm config print init-defaults > kubeadm.yaml

• 按需要修改yaml配置

apiVersion: kubeadm.k8s.io/v1beta2 bootstrapTokens: - groups:   - system:bootstrappers:kubeadm:default-node-token   token: abcdef.0123456789abcdef   ttl: 24h0m0s   usages:   - signing   - authentication kind: InitConfiguration localAPIEndpoint:   # 此处需要修改为master主节点 IP   advertiseAddress:  10.132.24.99   bindPort: 6443 nodeRegistration:   criSocket: /var/run/dockershim.sock   name: kubernetes-master   taints:   - effect: NoSchedule     key: node-role.kubernetes.io/master --- apiServer:   timeoutForControlPlane: 4m0s apiVersion: kubeadm.k8s.io/v1beta2 certificatesDir: /etc/kubernetes/pki clusterName: kubernetes # 多主节点需要修改这里：修改为主节点ip controlPlaneEndpoint: "10.136.17.12:6443" controllerManager: {} dns:   type: CoreDNS etcd:   local:     dataDir: /var/lib/etcd # 国内不能访问 Google，修改为阿里云 imageRepository: registry.aliyuncs.com/google_containers kind: ClusterConfiguration # 修改版本号 kubernetesVersion: v1.19.0 networking:   dnsDomain: cluster.local   # 配置成 Calico 的默认网段   podSubnet: "10.244.0.0/16"   serviceSubnet: 10.1.0.0/16 scheduler: {} --- # 开启 IPVS 模式 apiVersion: kubeproxy.config.k8s.io/v1alpha1 kind: KubeProxyConfiguration featureGates:   SupportIPVSProxyMode: true mode: ipvs  

• 初始化集群 kubeadm init –config kubeadm.yaml –upload-certs // upload-certs用来同时生成master join语句

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  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/  You can now join any number of the control-plane node running the following command on each as root:    kubeadm join 10.136.17.12:6443 --token abcdef.0123456789abcdef      --discovery-token-ca-cert-hash sha256:2fbacdf6a9473d5da1d98900f73cd4e2396521772b12ac99017d6ae756d8c3cc      --control-plane --certificate-key f0725584c26c192xxxxx4dc5804a101ebc5d7b40257837eea0676d1972cca  Please note that the certificate-key gives access to cluster sensitive data, keep it secret! As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use "kubeadm init phase upload-certs --upload-certs" to reload certs afterward.  Then you can join any number of worker nodes by running the following on each as root:  kubeadm join 10.136.17.12:6443 --token abcdef.0123456789abcdef      --discovery-token-ca-cert-hash sha256:2fbacdf6a9473d5da1d98900f7xxxsssss6ae756d8c3cc  

• 拷贝kube/config文件 这样在当前节点可以执行 kubectl指令

mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config 

• 安装网络插件

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

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• 添加node节点到集群中

kubeadm join 10.136.17.12:6443 --token abcdef.0123456789abcdef      --discovery-token-ca-cert-hash sha256:2fbacdf6a9473d5da1d98900f7xxxsssss6ae756d8c3cc  

• 如需添加master节点执行以下操作

kubeadm join 10.136.17.12:6443 --token abcdef.0123456789abcdef      --discovery-token-ca-cert-hash sha256:2fbacdf6a9473d5da1d98900f73cd4e2396521772b12ac99017d6ae756d8c3cc      --control-plane --certificate-key f0725584c26c192xxxxx4dc5804a101ebc5d7b40257837eea0676d1972cca 

清理脚本

#!/bin/bash kubeadm reset -f  ifconfig cni0 down && ip link delete cni0 ifconfig flannel.1 down && ip link delete flannel.1 rm -rf /var/lib/cni/

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