问题

执行kubectl get pods的时候出现以下内容，

E0410 22:54:36.968355    2502 memcache.go:265] couldn't get current server API group list: Get "https://192.168.4.5:6443/api?timeout=32s": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
E0410 22:54:36.982819    2502 memcache.go:265] couldn't get current server API group list: Get "https://192.168.4.5:6443/api?timeout=32s": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
E0410 22:54:36.997249    2502 memcache.go:265] couldn't get current server API group list: Get "https://192.168.4.5:6443/api?timeout=32s": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
E0410 22:54:37.012764    2502 memcache.go:265] couldn't get current server API group list: Get "https://192.168.4.5:6443/api?timeout=32s": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
E0410 22:54:37.027750    2502 memcache.go:265] couldn't get current server API group list: Get "https://192.168.4.5:6443/api?timeout=32s": tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")
Unable to connect to the server: tls: failed to verify certificate: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "kubernetes")

原因：这是在重新创建集群之前，原来集群的rm -rf $HOME/.kube文件没有删除，所以导致了认证失去作用。

解决方法

方法1：

  1. 执行rm -rf $HOME/.kube删除这个路径下的文件
  2. 重新复制config文件：
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

方法2：

执行以下操作：

echo export KUBECONFIG=/etc/kubernetes/kubelet.conf >> ~/.bashrc
source ~/.bashrc