一、准备环境
准备环境：
| 角色 | IP地址 |
| k8s-master | 192.168.56.21 |
| k8s-node01 | 192.168.56.25 |
| k8s-node02 | 192.168.56.26 |
所有节点环境初始化：
关闭防火墙： systemctl stop firewalld systemctl disable firewalld 关闭selinux： sed -i 's/enforcing/disabled/' /etc/selinux/config setenforce 0 关闭swap： swapoff -a sed -ri 's/.*swap.*/#&/' /etc/fstab 按IP分别设置主机名： hostnamectl set-hostname k8s-master hostnamectl set-hostname k8s-node01 hostnamectl set-hostname k8s-node02 仅在master添加hosts： cat >> /etc/hosts << EOF 192.168.56.21 k8s-master 192.168.56.25 k8s-node01 192.168.56.26 k8s-node02 EOF 将桥接的IPv4流量传递到iptables的链： cat > /etc/sysctl.d/k8s.conf << EOF net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF
sysctl --system 时间同步： yum install ntpdate -y ntpdate time.windows.com
echo "*/5 * * * * /usr/sbin/ntpdate time.windows.com" >>/var/spool/cron/root
二、在所有节点安装Docker、kubeadm、kubectl、kubelet
2.1 安装docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum install -y yum-utils device-mapper-persistent-data lvm2 yum -y install docker-ce systemctl enable docker && systemctl start docker
2.2 配置阿里云yum源
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
2.3 三个节点安装kubeadmin、kubelet，仅在k8s-master节点上安装kubectl
yum install -y kubelet-1.19.0 kubeadm-1.19.0 kubectl-1.19.0 systemctl enable kubelet
三、部署kubernetes master
kubeadm init \ --apiserver-advertise-address=192.168.56.21 \ --image-repository registry.aliyuncs.com/google_containers \ --kubernetes-version v1.19.0 \ --service-cidr=10.96.0.0/12 \ --pod-network-cidr=10.244.0.0/16 \ --ignore-preflight-errors=all mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
# kubeadm init \ > --apiserver-advertise-address=192.168.56.21 \ > --image-repository registry.aliyuncs.com/google_containers \ > --kubernetes-version v1.19.0 \ > --service-cidr=10.96.0.0/12 \ > --pod-network-cidr=10.244.0.0/16 \ > --ignore-preflight-errors=all W1005 15:41:47.137328 25574 configset.go:348] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io] [init] Using Kubernetes version: v1.19.0 [preflight] Running pre-flight checks # 检查环境 [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/ [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.9. Latest validated version: 19.03 [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' [certs] Using certificateDir folder "/etc/kubernetes/pki" # 生成k8s和etcd证书 [certs] Generating "ca" certificate and key [certs] Generating "apiserver" certificate and key [certs] apiserver serving cert is signed for DNS names [k8s-master kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 192.168.56.21] [certs] Generating "apiserver-kubelet-client" certificate and key [certs] Generating "front-proxy-ca" certificate and key [certs] Generating "front-proxy-client" certificate and key [certs] Generating "etcd/ca" certificate and key [certs] Generating "etcd/server" certificate and key [certs] etcd/server serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.56.21 127.0.0.1 ::1] [certs] Generating "etcd/peer" certificate and key [certs] etcd/peer serving cert is signed for DNS names [k8s-master localhost] and IPs [192.168.56.21 127.0.0.1 ::1] [certs] Generating "etcd/healthcheck-client" certificate and key [certs] Generating "apiserver-etcd-client" certificate and key [certs] Generating "sa" key and public key [kubeconfig] Using kubeconfig folder "/etc/kubernetes" # 生成kubeconfig文件 [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 [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" # 生成kubelet配置文件 [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Starting the kubelet [control-plane] Using manifest folder "/etc/kubernetes/manifests" # 部署管理节点组件，用镜像启动 kubectl get pod -n kube-system [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" # 部署etcd数据库用镜像启动 [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 14.006837 seconds [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace # 上传配置文件到k8s中 [kubelet] Creating a ConfigMap "kubelet-config-1.19" in namespace kube-system with the configuration for the kubelets in the cluster [upload-certs] Skipping phase. Please see --upload-certs [mark-control-plane] Marking the node k8s-master as control-plane by adding the label "node-role.kubernetes.io/master=''" # 给管理节点打一个标签 [mark-control-plane] Marking the node k8s-master as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule] # 将给管理节点打一个污点 [bootstrap-token] Using token: 46x35t.q5wjyktnsjdeu7gk # 自动为kubelet颁发证书 [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles [bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes [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 [kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key [addons] Applied essential addon: CoreDNS # 部署插件coredns和kube-proxy [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: # 接下来需要在master执行的命令 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config # 还需要部署一个网络组件 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: # 将node节点加入master的命令 kubeadm join 192.168.56.21:6443 --token 46x35t.q5wjyktnsjdeu7gk \ --discovery-token-ca-cert-hash sha256:8d44716e10fc9c16a45cb988cee767f0d4e59f1885e71914cc0ad94ba065aaf4