二进制部署一套高可用K8s集群-1.25+（三）

四、部署kubectl命令行工具

1、下载和分发 kubectl 二进制文件

我这里直接将下载好二进制包上传至Master1服务器节点中，然后拷贝至其他节点

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# tar -zxvf kubernetes-client-linux-amd64.tar.gz
kubernetes/
kubernetes/client/
kubernetes/client/bin/
kubernetes/client/bin/kubectl
kubernetes/client/bin/kubectl-convert


[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    scp kubernetes/client/bin/kubectl root@${node_ip}:/opt/k8s/bin/
    ssh root@${node_ip} "chmod +x /opt/k8s/bin/*"
  done

2、创建admin证书和私钥

2.1：创建证书签名请求

[root@k8s-master1 ~]# cd /opt/k8s/work
[root@k8s-master1 work]# cat > admin-csr.json <<EOF
{
  "CN": "admin",
  "hosts": [],
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names": [
    {
      "C": "CN",
      "ST": "ShangHai",
      "L": "ShangHai",
      "O": "system:masters",
      "OU": "dqz"
    }
  ]
}
EOF

2.2：生成证书和私钥

[root@k8s-master1 work]# cfssl gencert -ca=/opt/k8s/work/ca.pem \
  -ca-key=/opt/k8s/work/ca-key.pem \
  -config=/opt/k8s/work/ca-config.json \
  -profile=kubernetes admin-csr.json | cfssljson -bare admin

[root@k8s-master1 work]# ls admin*
admin.csr  admin-csr.json  admin-key.pem  admin.pem

3、创建 kubeconfig 文件

[root@k8s-master1 work]# kubectl config set-cluster kubernetes \
  --certificate-authority=/opt/k8s/work/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kubectl.kubeconfig

设置客户端参数

[root@k8s-master1 work]# kubectl config set-credentials admin \
  --client-certificate=/opt/k8s/work/admin.pem \
  --client-key=/opt/k8s/work/admin-key.pem \
  --embed-certs=true \
  --kubeconfig=kubectl.kubeconfig

文章来源(Source)：浅时光博客

设置上下文参数

[root@k8s-master1 work]# kubectl config set-context kubernetes \
  --cluster=kubernetes \
  --user=admin \
  --kubeconfig=kubectl.kubeconfig

设置默认上下文

[root@k8s-master1 work]# kubectl config use-context kubernetes --kubeconfig=kubectl.kubeconfig

4、分发kubeconfig文件

分发文件至所有Master和Work节点

文章来源(Source)：浅时光博客

[root@k8s-master1 work]# for node_ip in ${NODE_IPS[@]}
  do
    echo ">>> ${node_ip}"
    ssh root@${node_ip} "mkdir -p ~/.kube"
    scp kubectl.kubeconfig root@${node_ip}:~/.kube/config
  done

5、确认kubectl已经可以使用

确保Master节点和Work节点的kubectl命令都可以使用

[root@k8s-master1 work]# kubectl --help

6、配置kubectl命令补全

所有节点执行

yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
echo "source <(kubectl completion bash)" >> ~/.bashrc