安装Kubernetes报错：The connection to

$ kubectl get pods --all-namespaces
The connection to the server localhost:8080 was refused - did you specify the right host or port?

原因：
kube-apiserver默认只启动安全访问接口6443，而不启动非安装访问接口8080

解决方案：

$ sudo vi /etc/kubernetes/manifests/kube-apiserver.yaml
# 修改--insecure-port=8080
--insecure-port=0

重启kube-apiserver

$ sudo docker ps |grep 'kube-apiserver'
603d90351617        06924f18fe15                                  "kube-apiserver --..."   5 minutes ago       Up 5 minutes                            k8s_kube-apiserver_kube-apiserver-kube-node1_kube-system_6a57a51e24c908ce9bda1e57855173b0_7
$ docker restart 603d90351617