k8s：The connection to the server localhost:8080 was refused - did you specify the right host or port?

前言

k8s 集群 node节点报错：The connection to the server localhost:8080 was refused - did you specify the right host or port?

通过 kubectl get nodes 查看集群的情况，出现了报错，内容如下：

$ kubectl get pod
E0529 02:28:59.776677  415799 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0529 02:28:59.777439  415799 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0529 02:28:59.778983  415799 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0529 02:28:59.780888  415799 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
E0529 02:28:59.782303  415799 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp 127.0.0.1:8080: connect: connection refused
The connection to the server localhost:8080 was refused - did you specify the right host or port?

原因：
kubectl 默认从 ~/.kube/config 配置文件获取访问 kube-apiserver 地址、证书、用户名等信息，如果没有配置该文件会读取默值，即 localhost:8080，而本机的 localhost:8080 没有服务因而报 The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决

先检查当前 kubectl 配置加载信息，kubectl config view，如果为空需要检查 /etc/kubernetes/admin.conf 配置文件和 $HOME/.kube/config 配置，如果不存在，需要复制master节点上的配置到当前节点上

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

指定配置文件路径

如果你的配置文件不在默认路径，可以通过 KUBECONFIG 环境变量指定路径，或者在命令行中使用 --kubeconfig 选项。

使用 KUBECONFIG 环境变量

export KUBECONFIG=/path/to/your/kubeconfig
kubectl config view

使用 --kubeconfig 选项

 kubectl --kubeconfig=/etc/kubernetes/admin.conf config view