can not get kube-apiserver from kube-dash

[jazeltq]

Right now, if we disable tls, the kube-dashboard pod may be scheduled to
minion, and the there is no args to point out where is the kube-apiserver.
So access ui will be fault. We should add them

[yatin (yatinkarel)]

Just for tracking the info and discussion on https://review.openstack.org/#/c/491663/:-
I too checked, the issue is only with --tls-disabled.
With tls-disabled --apiserver-host argument need to be passed, me neither know about auto discover, attaching kubectl log for dashboard with apiserver-host and without apiserver-host:-

with apiserver-host and tls-disabled:-
[fedora@k8-vc5zg2qymq-0-jpvbtet27xsw-kube-master-tok35nrnl64w ~]$ kubectl logs --namespace kube-system kubernetes-dashboard-3203831700-vbp2f
Using HTTP port: 9090
Creating API server client for https://10.254.0.1:443
Successful initial request to the apiserver, version: v1.5.3
Creating in-cluster Heapster client
Using service account token for csrf signing
[fedora@k8-vc5zg2qymq-0-jpvbtet27xsw-kube-master-tok35nrnl64w ~]$ kubectl describe po --namespace kube-system kubernetes-dashboard-3203831700-vbp2f
Name: kubernetes-dashboard-3203831700-vbp2f
Namespace: kube-system
Node: k8-dseyedlnyv-0-kgkosjcptyzi-kube-minion-nlyae2xbfbvq/10.0.0.11
Start Time: Wed, 16 Aug 2017 12:59:41 +0000
Labels: app=kubernetes-dashboard
  pod-template-hash=3203831700
Status: Running
IP: 10.100.54.2
Controllers: ReplicaSet/kubernetes-dashboard-3203831700
Containers:
  kubernetes-dashboard:
    Container ID: docker://be274fc94a344e1a2be792a376f595012e043b1789712572ac40a294e2a59070
    Image: gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1
    Image ID: docker-pullable://gcr.io/google_containers/kubernetes-dashboard-amd64@sha256:46a09eb9c611e625e7de3fcf325cf78e629d002e57dc80348e9b0638338206b5
    Port: 9090/TCP
    State: Running
      Started: Wed, 16 Aug 2017 13:00:36 +0000
    Ready: True
    Restart Count: 0
    Liveness: http-get http://:9090/ delay=30s timeout=30s period=10s #success=1 #failure=3
    Volume Mounts:
      /var/run/secrets/kubernetes.io/serviceaccount from default-token-zqthp (ro)
    Environment Variables: <none>
Conditions:
  Type Status
  Initialized True
  Ready True
  PodScheduled True
Volumes:
  default-token-zqthp:
    Type: Secret (a volume populated by a Secret)
    SecretName: default-token-zqthp
QoS Class: BestEffort
Tolerations: dedicated=master:Equal:NoSchedule
Events:
  FirstSeen LastSeen Count From SubObjectPath Type Reason Message
  --------- -------- ----- ---- ------------- -------- ------ -------
  3m 3m 1 {default-scheduler } Normal Scheduled Successfully assigned kubernetes-dashboard-3203831700-vbp2f to k8-dseyedlnyv-0-kgkosjcptyzi-kube-minion-nlyae2xbfbvq
  2m 2m 1 {kubelet k8-dseyedlnyv-0-kgkosjcptyzi-kube-minion-nlyae2xbfbvq} spec.containers{kubernetes-dashboard} Normal Pulling pulling image "gcr.io/google_containers/kubernetes-dashboard-amd64:v1.5.1"
  2m 2m 2 {kubelet k8-dseyedlnyv-0-kgkosjcptyzi-kube-minion-nlyae2xbfbvq} Warning MissingClusterDNS kubelet does not have ClusterDNS IP configured and cannot create Pod using "ClusterFirst" policy. Falling back to DNSDefault policy.
  2m 2m 1 {kubelet k8-dseyedlnyv-0-kgkosjcptyzi-kube-minion-nlyae2xbfbvq} spec.containers{kubernetes-dashboard} Normal Pulled Successfully pulled image "gcr.io/google_containers/kubernetes-dashboard-amd64:...

[OpenStack Infra (hudson-openstack)]

Change abandoned by Feilong Wang (<email address hidden>) on branch: master
Review: https://review.opendev.org/494770
Reason: https://docs.openstack.org/doc-contrib-guide/writing-style/code-conventions.html