Skip to content

Kubernetes

The Kubernetes connectivity has the following requirements:

  • Kubernetes 1.19+
  • Metrics Service
  • An Ingress controller

The Kubernetes connection is configured in the kubernetes.yaml file. There are 3 modes to choose from:

  • disabled - disables kubernetes connectivity
  • default - uses the default kubeconfig resolution
  • cluster - uses a service account inside the cluster
mode: default

Services

Once the Kubernetes connection is configured, individual services can be configured to pull statistics. Only CPU and Memory are currently supported.

Inside of the service you'd like to connect to a pod:

- Emby:
  icon: emby.png
  href: "http://emby.home/"
  description: Media server
  namespace: media # The kubernetes namespace the app resides in
  app: emby # The name of the deployed app

The app field is used to create a label selector, in this example case it would match pods with the label: app.kubernetes.io/name=emby.

Sometimes this is insufficient for complex or atypical application deployments. In these cases, the podSelector field can be used. Any field selector can be used with it, so it allows for some very powerful selection capabilities.

For instance, it can be utilized to roll multiple underlying deployments under one application to see a high-level aggregate:

- Element Chat:
      icon: matrix-light.png
      href: https://chat.example.com
      description: Matrix Synapse Powered Chat
      app: matrix-element
      namespace: comms
      podSelector: >-
          app.kubernetes.io/instance in (
              matrix-element,
              matrix-media-repo,
              matrix-media-repo-postgresql,
              matrix-synapse
          )

NOTE: A blank string as a podSelector does not deactivate it, but will actually select all pods in the namespace. This is a useful way to capture the resource usage of a complex application siloed to a single namespace, like Longhorn.

Automatic Service Discovery

Homepage features automatic service discovery by Ingress annotations. All configuration options can be applied using typical annotation syntax, beginning with gethomepage.dev/.

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
    name: emby
    annotations:
        gethomepage.dev/enabled: "true"
        gethomepage.dev/description: Media Server
        gethomepage.dev/group: Media
        gethomepage.dev/icon: emby.png
        gethomepage.dev/name: Emby
        gethomepage.dev/widget.type: "emby"
        gethomepage.dev/widget.url: "https://emby.example.com"
        gethomepage.dev/podSelector: ""
        gethomepage.dev/weight: 10 # optional
spec:
    rules:
        - host: emby.example.com
          http:
              paths:
                  - backend:
                        service:
                            name: emby
                            port:
                                number: 8080
                    path: /
                    pathType: Prefix

When the Kubernetes cluster connection has been properly configured, this service will be automatically discovered and added to your Homepage. You do not need to specify the namespace or app values, as they will be automatically inferred.

Traefik IngressRoute support

Homepage can also read ingresses defined using the Traefik IngressRoute custom resource definition. Due to the complex nature of Traefik routing rules, it is required for the gethomepage.dev/href annotation to be set:

apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
    name: emby
    annotations:
        gethomepage.dev/href: "https://emby.example.com"
        gethomepage.dev/enabled: "true"
        gethomepage.dev/description: Media Server
        gethomepage.dev/group: Media
        gethomepage.dev/icon: emby.png
        gethomepage.dev/name: Emby
        gethomepage.dev/widget.type: "emby"
        gethomepage.dev/widget.url: "https://emby.example.com"
        gethomepage.dev/podSelector: ""
        gethomepage.dev/weight: 10 # optional
spec:
    entryPoints:
        - websecure
    routes:
        - kind: Rule
          match: Host(`emby.example.com`)
          services:
              - kind: Service
                name: emby
                namespace: emby
                port: 8080
                scheme: http
                strategy: RoundRobin
                weight: 10

If the href attribute is not present, Homepage will ignore the specific IngressRoute.

Caveats

Similarly to Docker service discovery, there currently is no rigid ordering to discovered services and discovered services will be displayed above those specified in the services.yaml.