[root@kub1 ~]# kubectl logs kubernetes-dashboard-3203831700-mtp29 -n kube-system
Using HTTP port: 9090
Creating API server client for https://10.96.0.1:443
Error while initializing connection to Kubernetes apiserver. This most likely means that the cluster is misconfigured (e.g., it has invalid apiserver certificates or service accounts configuration) or the --apiserver-host param points to a server that does not exist. Reason: Get https://10.96.0.1:443/version: dial tcp 10.96.0.1:443: i/o timeout
Refer to the troubleshooting guide for more information: https://github.com/kubernetes/dashboard/blob/master/docs/user-guide/troubleshooting.md
[root@kub1 ~]# kubectl exec -it kube-apiserver-kub1.localhost -n kube-system -- ll /var/run/secrets/kubernetes.io/serviceaccount/token
exec: "ll": executable file not found in $PATH
error: error stream protocol error: invalid exit code value "-1"
[root@kub1 ~]# kubectl exec -it kube-apiserver-kub1.localhost -n kube-system -- ls /var/run/secrets/kubernetes.io/serviceaccount/token
ls: /var/run/secrets/kubernetes.io/serviceaccount/token: No such file or directory
[root@kub1 ~]# ll /var/run/secrets/kubernetes.io/serviceaccount/token
ls: cannot access /var/run/secrets/kubernetes.io/serviceaccount/token: No such file or directory

[root@kub1 ~]# kubectl get services --all-namespaces
NAMESPACE     NAME                   CLUSTER-IP      EXTERNAL-IP   PORT(S)         AGE
default       kubernetes             10.96.0.1       <none>        443/TCP         1h
kube-system   calico-etcd            10.96.232.136   <none>        6666/TCP        1h
kube-system   kube-dns               10.96.0.10      <none>        53/UDP,53/TCP   1h
kube-system   kubernetes-dashboard   10.99.13.119    <nodes>       80:31289/TCP    1h
policy-demo   nginx                  10.109.20.171   <none>        80/TCP          1h


[root@kub1 ~]# kubectl exec busybox -- curl -k https://10.96.0.1
exec: "curl": executable file not found in $PATH
error: error stream protocol error: invalid exit code value "-1"
[root@kub1 ~]# kubectl exec test-701078429-g8q09 -- curl -k https://10.96.0.1
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:14 --:--:--     0^C