集群主节点安装方法如下：
    1.参看下面连接信息：
    https://www.yuque.com/nickname-uo8wh/rycohh/oza3bw
    安装完毕之后，从节点只需要安装到第10步，此时从节点不需要init
    拷贝主节点安装从节点信息，在从节点位置执行下面方式：

    1. [root@localhost docker]#  kubeadm join 192.168.0.127:6443 --token fvdmel.61fjcb4ej591sujj \
    2.     --discovery-token-ca-cert-hash sha256:f36a0ec6acd67259e8f86a6a882bdf445685341a4c2b52cebc7e9651d3de7ec6

    如果长时间没有加入集群中，可能存在token失效的情况，此时在主节点上，做如下操作，重新获取token：

    1. [root@master01 k8s]# kubeadm token create
    2. W0517 01:41:44.766379  948637 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
    3. 263ih8.r7ha83r2l115x35f

    集群安装完成之后登录控制台，使用token匿名登录之后会存在看不到控制面板的情况，需要执行以下命令，让控制台能够看到集群的工作情况

    1. [root@master01 k8s]# openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'
    2. 2dccc854ba53678dc594a7b2c9fda859370c616ab9599e84b3014f4d2134d8a1
    1. 出现以下信息代表加入集群成功：
    2. [root@localhost docker]# kubeadm join 192.168.0.112:6443 --token i7pd7i.jipszw0hku7gzekj --discovery-token-ca-cert-hash sha256:2dccc854ba53678dc594a7b2c9fda859370c616ab9599e84b3014f4d2134d8a1
    3. W0517 01:59:22.532878   11190 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set.
    4. [preflight] Running pre-flight checks
    5.         [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/
    6.         [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 20.10.6. Latest validated version: 19.03
    7.         [WARNING Service-Kubelet]: kubelet service is not enabled, please run 'systemctl enable kubelet.service'
    8. [preflight] Reading configuration from the cluster...
    9. [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
    10. [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace
    11. [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
    12. [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
    13. [kubelet-start] Starting the kubelet
    14. [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
    16. This node has joined the cluster:
    17. * Certificate signing request was sent to apiserver and a response was received.
    18. * The Kubelet was informed of the new secure connection details.
    20. Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
    1. 在主节点运行：
    1. [root@master01 k8s]# kubectl get nodes
    2. NAME                STATUS   ROLES    AGE     VERSION
    3. master01.paas.com   Ready    master   3d7h    v1.18.0
    4. master03.paas.com   Ready    <none>   8m50s   v1.18.0
    5. node01              Ready    worker   3d6h    v1.18.0

    集群加入成功