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Assigning a static IP address for Knative on Kubernetes Engine

If you are running Knative on Google Kubernetes Engine and want to use a custom domain with your apps, you need to configure a static IP address to ensure that your custom domain mapping doesn't break.

Knative uses the shared knative-shared-gateway Gateway under the knative-serving namespace to serve all incoming traffic within the Knative service mesh. The IP address to access the gateway is the external IP address of the "knative-ingressgateway" service under the istio-system namespace. Therefore, in order to set a static IP for the Knative shared gateway knative-shared-gateway, you must to set the external IP address of the knative-ingressgateway service to a static IP.

Step 1: Reserve a static IP address

You can reserve a regional static IP address using the Google Cloud SDK or the Google Cloud Platform console.

Using the Google Cloud SDK:

  1. Enter the following command, replacing IP_NAME and REGION with appropriate values. For example, select the us-west1 region if you deployed your cluster to the us-west1-c zone: 
    gcloud beta compute addresses create IP_NAME --region=REGION
    For example: 
    gcloud beta compute addresses create knative-ip --region=us-west1
  2. Enter the following command to get the newly created static IP address: 
    gcloud beta compute addresses list

In the GCP console:

  1. Enter a name for your static address.

  2. For IP version, choose IPv4.

  3. For Type, choose Regional.

  4. From the Region drop-down, choose the region where your Knative cluster is running.

    For example, select the us-west1 region if you deployed your cluster to the us-west1-c zone.

  5. Leave the Attached To field set to None since we'll attach the IP address through a config-map later.

  6. Copy the External Address of the static IP you created.

Step 2: Update the external IP of the knative-ingressgateway service

Run following command to configure the external IP of the knative-ingressgateway service to the static IP that you reserved:

kubectl patch svc knative-ingressgateway --namespace istio-system --patch '{"spec": { "loadBalancerIP": "<your-reserved-static-ip>" }}'

Step 3: Verify the static IP address of knative-ingressgateway service

Run the following command to ensure that the external IP of the "knative-ingressgateway" service has been updated:

kubectl get svc knative-ingressgateway --namespace istio-system

The output should show the assigned static IP address under the EXTERNAL-IP column:

NAME                     TYPE           CLUSTER-IP      EXTERNAL-IP     PORT(S)                                      AGE
knative-ingressgateway   LoadBalancer   12.34.567.890   98.765.43.210   80:32380/TCP,443:32390/TCP,32400:32400/TCP   5m

Note: Updating the external IP address can take several minutes.

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