使用kubeadm安装k8s集群（v1.18.0）

一、安装环境

系统

[root@master1 ~]# cat /etc/redhat-release CentOS Linux release 7.9.2009 (Core)[root@master1 ~]# uname -aLinux master1 3.10.0-1160.el7.x86_64 #1 SMP Mon Oct 19 16:18:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

配置

角色

IP

配置

master1

172.16.0.11

4核4G内存

node1

172.16.0.12

4核4G内存

node2

172.16.0.13

4核4G内存

二、基础配置（所有服务器都要配置）

更改服务器名称

hostnamectl set-hostname master1 #在master1上操作hostnamectl set-hostname node1 #在node1上操作hostnamectl set-hostname node2 #在node2上操作

添加域名绑定（所有服务器都要操作）

cat >> /etc/hosts << EOF172.16.0.11 master1172.16.0.12 node1172.16.0.13 node2EOF

关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

关闭selinux

setenforce 0 && sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

关闭swap分区

swapoff -a && sed -ri 's/.*swap.*/#&/' /etc/fstab

6.将桥接的IPv4流量传递到iptables的链

cat > /etc/sysctl.d/k8s.conf << EOFnet.bridge.bridge-nf-call-ip6tables = 1net.bridge.bridge-nf-call-iptables = 1EOFsysctl --system #让配置生效

配置时间同步

yum install -y ntpdate && ntpdate time.windows.com

三、安装docker（所有服务器都要配置）

卸载旧版本的docker

yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine

安装docker

yum install -y wgetwget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repoyum -y install docker-ce-18.06.1.ce-3.el7

启动docker及配置为开机启动

systemctl enable docker && systemctl start docker

查看docker版本

docker --version

配置阿里云镜像加速

mkdir -p /etc/dockertee /etc/docker/daemon.json <<-'EOF'{ "registry-mirrors": ["https://sx15mtuf.mirror.aliyuncs.com"]}EOFsystemctl daemon-reloadsystemctl restart docker

四、添加阿里云yum源（所有服务器都要配置）

cat > /etc/yum.repos.d/kubernetes.repo << EOF[kubernetes]name=Kubernetesbaseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64enabled=1gpgcheck=0repo_gpgcheck=0gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpgEOF

五、安装kubeadm、kubelet、kubectl（所有服务器都要配置）

安装三大件

yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0

设置开机启动

systemctl enable kubelet

六、初始化master1节点（仅master1节点操作）

初始化master1节点

kubeadm init \ --apiserver-advertise-address=172.16.0.11 \ --image-repository registry.aliyuncs.com/google_containers \ --kubernetes-version v1.18.0 \ --service-cidr=10.96.0.0/12 \ --pod-network-cidr=10.244.0.0/16

配置kubectl工具

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

七、部署CNI插件（仅master1节点操作）

wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.ymlkubectl apply -f kube-flannel.ymlkubectl get pods -n kube-system #查看flannel状态kubectl get nodes #flannel就绪后，我们可以看到master1也已经就绪

八、添加node节点(所有node节点上操作)

将master1节点的flannel配置拷贝到node节点

scp -r /etc/cni root@172.16.0.12:/etc/cni #这个是在master1上操作的systemctl restart kubelet

将node节点加入到集群

kubeadm join 172.16.0.11:6443 --token x1spbh.gfwauz5pp9x8jk5j --discovery-token-ca-cert-hash sha256:601a110b6cb91577322b3dc2253140a5f2c2eed6873495c213ff9795dcdfb2a6

查看节点状态

kubectl get nodes

九、测试

kubectl create deployment nginx --image=nginxkubectl expose deployment nginx --port=80 --type=NodePortkubectl get pod,svc

十、安装dashboard

下载yml文件

wget https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-rc7/aio/deploy/recommended.yaml

将recommended.yaml如下两处新增

kind: ServiceapiVersion: v1metadata: labels: k8s-app: kubernetes-dashboard name: kubernetes-dashboard namespace: kubernetes-dashboardspec: type: NodePort #新增 ports: - port: 443 targetPort: 8443 nodePort: 30001 #新增 selector:k8s-app: kubernetes-dashboard

执行并生效

kubectl create -f recommended.yaml

创建serceaccount和clusterrolebinding资源YAML文件

vim adminuser.yamlapiVersion: v1kind: ServiceAccountmetadata: name: admin-user namespace: kubernetes-dashboard apiVersion: rbac.authorization.k8s.io/v1kind: ClusterRoleBindingmetadata: name: admin-userroleRef: apiGroup: rbac.authorization.k8s.io kind: ClusterRole name: cluster-adminsubjects:- kind: ServiceAccount name: admin-user namespace: kubernetes-dashboard

创建admin-user并且赋予admin-user集权管理员权限

kubectl create -f adminuser.yaml

6.在浏览器中输入 ​​​https://172.16.0.11:30001/​​ ​​

查看token

[root@master1 ~]# kubectl get secret -n kubernetes-dashboardNAME TYPE DATA AGEdefault-token-nzrk4 kubernetes.io/service-account-token 3 89mkubernetes-dashboard-certs Opaque 0 89mkubernetes-dashboard-csrf Opaque 1 89mkubernetes-dashboard-key-holder Opaque 2 89mkubernetes-dashboard-token-bs9qp kubernetes.io/service-account-token 3 89m #找到此项[root@master1 ~]# kubectl describe secret kubernetes-dashboard-token-bs9qp -n kubernetes-dashboard Name: kubernetes-dashboard-token-bs9qpNamespace: kubernetes-dashboardLabels: <none>Annotations: kubernetes.io/service-account.name: kubernetes-dashboard kubernetes.io/service-account.uid: e03da0c2-3e9c-42d6-b1da-3417e3cc2764Type: kubernetes.io/service-account-tokenData====token: eyJhbGciOiJSUzI1NiIsImtpZCI6ImNfTmhqVFdsbXpiRUpTTnA1bEhNanhnMUNTY2lQUWJDd0FBcWljQXExejAifQ.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.0CVjK8WjyDiyYShSwyCyTKN-f3FoYDlgIX--_ISshxLmmzJJRJolqiUXkbCs_OBZUhOz_3tJarpjgnFUcoETpFgDjdB9naztbajTPrGDIgLzjVWKsvnsfAKaMGxnpyNLBnCQAQzmGBKfNBg6jnxhEAxcTkA42N0yxxX8-30PTNsZjW8hx8haoSYoUK_ttlVbi1ajT8JHg2YCo3Scxdg01niZpsTntmqtSeraxE7bPgDCGBX6281iMAhlT9vDXTkYUlFoEXqdIC717cvDsh-ky0xEkOR4pEnmUiOTEIJWor_lr8LMA4FCaA1v2Xw-4f9rHDEzjWq2DTjn4DI2WWia2Aca.crt: 1025 bytesnamespace: 20 bytes[root@master1 ~]#

输入token，就可以进入dashboard了