K8s dashboard showing "no healthy upstream"; remove K8s dashboard links and services

[richardsliu]

This is configured as:

// This service adds a rule to our reverse proxy for accessing the K8s dashboard.
local k8sDashboard = {
  local isDashboardTls = if params.cloud == "acsengine" || params.cloud == "aks" then
    "false"
  else
    "true",
  // Due to https://github.com/ksonnet/ksonnet/issues/670, escaped characters in
  // jsonnet files are not interpreted correctly by ksonnet, which causes runtime
  // parsing failures. This is fixed in ksonnet 0.12.0, so we can merge this back
  // to the jsonnet file when we take a dependency on ksonnet 0.12.0 or later.
  local annotations = function(isDashboardTls) {
    "getambassador.io/config":
      std.join("\n", [
        "---",
        "apiVersion: ambassador/v0",
        "kind:  Mapping",
        "name: k8s-dashboard-ui-mapping",
        "prefix: /k8s/ui/",
        "rewrite: /",
        "tls: " + isDashboardTls,
        // We redirect to the K8s service created for the dashboard
        // in namespace kube-system. We don't use the k8s-dashboard service
        // because that isn't in the kube-system namespace and I don't think
        // it can select pods in a different namespace.
        "service: kubernetes-dashboard.kube-system",
      ]),
  },

However there is no such service in the kube-system namespace:

ricliu@ricliu:~/kubeflow/kubeflow$ kubectl -n kube-system get services
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default-http-backend NodePort 10.3.254.180 80:30631/TCP 12h
heapster ClusterIP 10.3.250.231 80/TCP 12h
kube-dns ClusterIP 10.3.240.10 53/UDP,53/TCP 12h
metrics-server ClusterIP 10.3.250.4 443/TCP 12h

[jcurlier]

+1

[jlewi]

Should we just get rid of the link to the K8s dashboard and let users take care of it using the appropriate solution for their K8s distribution.

This has never worked particularly well because the dashboard is not easy to authenticate to (on GKE you had to print an access token and then past it in). I also think the dashboard has been deprecated and removed on GKE and possibly others.

/area 0.4.0

/cc @swiftdiaries