Kubernetes dashboard through Ingress

Question

I have Kubernetes Cluster with Ingress/Traefik controller

Also, I installed the dashboard using the standard config from here: https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

I'm trying to access the Dashboard through Ingress, but I get 404 error

404 page not found

My ingress.yml file looks like this

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: "traefik"
  name: app-ingress-system
  namespace: kube-system
spec:
  tls:
  - hosts:
    - dashboard.domain.com
    secretName: kubernetes-dashboard-certs
  rules:
  - host: dashboard.domain.com
    http:
      paths:
      - path: /
        backend:
          serviceName: kubernetes-dashboard
          servicePort: 443

I've tried different - path: (like /dashboard, /proxy) same result

Answer 1

For dashboard 7.5.0

Traefik

For traefik v3.1.1 and dashboard 7.5.0, using this yaml, it's safer with websecure.

---
apiVersion: traefik.io/v1alpha1
kind: ServersTransport
metadata:
  name: dashboard-transport
  namespace: kubernetes-dashboard
spec:
  serverName: kubernetes-dashboard-kong-proxy
  insecureSkipVerify: true

---
apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
  name: dashboard
  namespace: default
spec:
  entryPoints:
    - websecure
  routes:
    - match: Host(`cluster1.example.com`)
      kind: Rule
      services:
        - name: kubernetes-dashboard-kong-proxy
          port: 443
          scheme: https
          serversTransport: dashboard-transport
          namespace: kubernetes-dashboard
  tls:
    secretName: cluster1.example.com
    domains:
      - main: cluster1.example.com
        sans:
          - traefik1.example.com

Nginx

dashboard 7.5.0

---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: dashboard
  namespace: kubernetes-dashboard
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /
    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
    cert-manager.io/cluster-issuer: example-com-letsencrypt-http01
spec:
  ingressClassName: nginx
  tls:
    - hosts:
        - cluster1.example.com
      secretName: cluster1.example.com
  rules:
    - host: cluster1.example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: kubernetes-dashboard-kong-proxy
                port:
                  number: 443

Answer 2

you can access the kubernetes dashboard without disabling ssl verification for the entire traefik server, by creating custom server transport for the ingressroute

---
apiVersion: traefik.containo.us/v1alpha1
kind: ServersTransport
metadata:
  name: kubernetes-dashboard-transport
  namespace: kubernetes-dashboard

spec:
  serverName: kubernetes-dashboard
  insecureSkipVerify: true

---              
apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  name: kubernetes-dashboard-ingress
  namespace: kubernetes-dashboard
spec:
  entryPoints:                      # [1]
    - websecure
  routes:                           # [2]
  - kind: Rule
    match:   Host(`k3sdashboard.example.xyz`) # [3]
    priority: 10                    # [4]
    services:                       # [8]
    - kind: Service 
      name: kubernetes-dashboard
      namespace: kubernetes-dashboard
      port: 443                      # [9]
      serversTransport: kubernetes-dashboard-transport
  tls:                              # [11]
    certResolver: dns-cloudflare   

Answer 3

This code works on microk8s. In some systems must change service kubernetes-dasboard type to NodePort

kubectl -n kube-system edit svc kubernetes-dashboard

Create a tls secret for yourdomain.com must be in the same namespace where is kubernates-dashboard, must have the crt and key files.

kubectl -n kube-system create secret tls yourdomain.com-tls --key="yourdomain.com.key" --cert="yourdomain.com.crt"

Use this code for create the ingress

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress-dashboard
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: public
    #this redirect to https if try to enter over http
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
    #this is required, because dashboard only run over HTTPS
    nginx.ingress.kubernetes.io/backend-protocol: HTTPS
    #this requiered if want to protect site
    #nginx.ingress.kubernetes.io/whitelist-source-range: <here your public ip>,<here server ip if want access from server>
spec:
  tls:
    - hosts:
      - dashboard.yourdomain.com
      secretName: yourdomain.com-tls
  rules:
  - host: dashboard.yourdomain.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: kubernetes-dashboard
            port: 
              number: 8443

Answer 4

This occurs because kubernetes-dashboard-certs doesnot have the file tls.crt and tls.key which are expected by traefik. You should get this in the traefik logs.

Next problems will be between traefik certificates and dashboard certificates. I still not understand how to fix properly this and configure traefik with the option :

 ssl.insecureSkipVerify: "true"

The last one I had, is that http endpoint doesnot accept login, then finally I declare the ingress that redirect http to https like this :

kubectl apply -f - << EOF
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
  annotations:
    kubernetes.io/ingress.class: traefik
    traefik.ingress.kubernetes.io/ssl-redirect: "true"
spec:
  rules:
    - host: dashboard.domain.com
      http:
        paths:
          - path: /
            backend:
              serviceName: kubernetes-dashboard
              servicePort: 443
EOF