Configure cluster external addresses

This feature allows overriding of external addresses of onboarded clusters through IngressGateway or Tier1Gateway install CR. The provided IP addresses/hostnames will then be used to access the clusters from the outside world. Note that this feature is useful only when you have some other IP address/hostname already configured to access your kubernetes cluster from the outside world.

Data Plane

To use this feature with IngressGateway, set the xcp.tetrate.io/cluster-external-addresses annotation under kubeSpec/service in your IngressGateway install (DataPlane) CR and apply it with kubectl. You can use:

• Single IP address
• Single DNS name
• Multiple IP addresses (comma separated)

But you can't configure multiple DNS names or combine an IP address with a DNS name.

apiVersion: install.tetrate.io/v1alpha1
kind: IngressGateway
metadata:
  name: bookinfo
  namespace: bookinfo
spec:
  kubeSpec:
    deployment:
      hpaSpec:
        maxRepicas: 10
        minReplicas: 1
        metrics:
        - resource:
            name: cpu
            targetAverageUtilization: 75
          type: Resource
      replicaCount: 1
      strategy:
        rollingUpdate:
          maxUnavailable: 0
        type: RollingUpdate
    service:
      annotations:
        xcp.tetrate.io/cluster-external-addresses: "10.10.10.10,20.20.20.20"
      ports:
      - name: mtls
        port: 15443
        targetPort: 15443
      - name: http2
        port: 80
        targetPort: 8080
      - name: https
        port: 443
        targetPort: 8443
      type: NodePort

The above CR will set the kubernetesExternalAddresses to 10.10.10.10 and 20.20.20.20 for the gateway service. You can verify this behaviour by checking at the Service Entry generated for the hostname exposed in the Ingressgateway.