追加节点（在master上执行）

追加节点

资源有限，我们这边尝试把master节点追加到集群中，如果是新机器，需要执行本文档的 安装前准备，把ca相关的证书分发到这个机器上，部署 flannel 网络步骤

2. 把ca相关的证书分发到这个机器上

5. 安装kubelet服务
   参照之前追加worker节点的操作，如果直接使用之前的kubelet-bootstrap.yml，发现节点无法加入，因为kubelet-bootstrap.yml中的token值有效期只有一天，如果token已经过期，在kube-apiserver中会出现错误

   2月 12 11:01:01 master kube-apiserver[5018]: E0212 11:01:01.640497    5018 authentication.go:104] Unable to authenticate the request due to an error: invalid bearer token 
   
   

   查看token

   root@master:/opt/k8s/work# kubeadm token list --kubeconfig ~/.kube/config
   TOKEN                     TTL         EXPIRES                     USAGES                   DESCRIPTION                                                EXTRA GROUPS
   5t989l.rweut7kedj7ifl1a      2020-02-11T18:19:41+08:00   authentication,signing   kubelet-bootstrap-token                                    system:bootstrappers:slave
   
   

   此时需要按照slave节点上安装kubelet的步骤，重新生成kubelet-bootstrap.yml

   将csr approve后，查看节点情况

   root@master:/opt/k8s/work# kubectl get nodes
   NAME     STATUS   ROLES    AGE   VERSION
   master   Ready       21s   v1.17.2
   slave    Ready       36h   v1.17.2
   
   

6. 安装kubeproxy服务

重新验证集群

root@master:/opt/k8s/yml# kubectl create -f nginx.yml
service/nginx created
deployment.apps/nginx-deployment created

root@master:/opt/k8s/yml# kubectl get pod -o wide
NAME                                READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
nginx-deployment-56f8998dbc-6b6qm   1/1     Running   0          87s   172.30.22.2   master              
root@master:/opt/k8s/yml# kubectl create -f busybox.yml
pod/busybox created

root@master:/opt/k8s/yml# kubectl get pod -o wide
NAME                                READY   STATUS    RESTARTS   AGE     IP            NODE     NOMINATED NODE   READINESS GATES
busybox                             1/1     Running   0          102s    172.30.22.3   master              
nginx-deployment-56f8998dbc-6b6qm   1/1     Running   0          3m20s   172.30.22.2   master              


root@master:/opt/k8s/yml# curl http://192.168.0.107:8080







Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.



root@master:/opt/k8s/yml# curl http://192.168.0.114:8080







Welcome to nginx!
If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.

For online documentation and support please refer to
nginx.org.

Commercial support is available at
nginx.com.

Thank you for using nginx.

可以看到访问集群中任意一个节点的8080端口，都可以正确访问到后端对应的nginx服务