学习来源：     51cto: https://edu.51cto.com/sd/518e5
                         腾讯课堂: https://ke.qq.com/course/2738602

K8s集群环境搭建：https://blog.csdn.net/qq_26900081/article/details/109291999

学习过程中一不小心把K8s给折腾坏了，重新初始化一下群里，一顿操作猛如虎，万幸恢复如初了。

master1上的命令kubectl都执行不了，众node上docker ps发现都容器全部不在了。

vi /var/log/messages 错误信息:  K8s node "localhost.master1.131" not found

1、所有节点（master和node）重置：kubeadm reset 

2、我修改了配置文件（所有master节点），所以重新配置一下： kubeadm config images pull --config ./kubeadm-config.yaml

3、初始化(master1主节点)：kubeadm init --config kubeadm-config.yaml --upload-certs

4、将master2、master3和所有node节点加入集群：参考 https://blog.csdn.net/qq_26900081/article/details/109331192

5、执行以下命令解决错误，需要重新配置这个目录.kube和文件：

错误信息：Unable to connect to the server: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")

[root@localhost ~]# rm -rf $HOME/.kube
[root@localhost ~]# mkdir -p $HOME/.kube
[root@localhost ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@localhost ~]# sudo chown $(id -u):$(id -g) $HOME/.kube/config

6、重新安装Calico：参考https://blog.csdn.net/qq_26900081/article/details/109331192第四节

7、按需重新安装Metrics和Dashboard、kuboard：参考https://blog.csdn.net/qq_26900081/article/details/109337475