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Prow cluster update

Updating a Prow cluster requires an improved Prow version. The Kubernetes Prow instance gets updated via a shell script. The shell script offers only a short list of the last pushed container tags and as a result, limits the versions to choose from. To cherry-pick updates, monitor Prow announcements to see when fixes or important changes are merged into the Kubernetes repository. This document describes how to update a Prow cluster using a cherry-picked Prow version.

Update process

To update a Prow cluster follow these steps:

  1. Follow this document for details to set up a Prow cluster.
  2. Go to the kubernetes/test-infra project and select a commit with the desired update for the Prow cluster. For example, use 2c8e0dbb96b4c1a86d42275dfbed5474a6d05def.
  3. Open starter.yaml from the upstream repository in the Kubernetes project and copy new tags for these containers:
    • gcr.io/k8s-prow/hook
    • gcr.io/k8s-prow/plank
    • gcr.io/k8s-prow/sinker
    • gcr.io/k8s-prow/deck
    • gcr.io/k8s-prow/horologium
    • gcr.io/k8s-prow/tide
  4. Copy the commit ID into a comment at the top of the file to keep track of the current release used for the deployments.
  5. Use your preferred diff tool to check and copy the stability update in a Prow component and additional configurations on existing components.
  6. Open both config.yaml in the current project and config.yaml in the Kubernetes project and copy new tags for these containers:
    • gcr.io/k8s-prow/initupload
    • gcr.io/k8s-prow/entrypoint
    • gcr.io/k8s-prow/sidecar
  7. Open Dockerfile in the current project and update base image tag with new the tag for container from upstream repo.
    • gcr.io/k8s-prow/clonerefs
  8. When the new image is ready, copy its tag and paste it to config.yaml for gcr.io/k8s-prow/clonerefs container.
  9. Use your preferred diff tool to check and copy the stability update in the Prow component and additional configurations for the existing components.
  10. Run this command to update Prow deployments: 
    kubectl apply -f prow/cluster/components
  11. Use the update-config.sh {file_path} script to apply the Prow configuration on a cluster. Run the following command:
./update-config.sh ../prow/config.yaml
  1. Make sure that the update was successful. For example, run kubectl get pods to check if it doesn't show errors on the updated test cluster and the dashboard is still reachable.
  2. Create a pull request.

Troubleshooting

If after the update pods don't start, use the previous commit to bring back the previous deployments' version. Follow these steps:

  1. Run the following command to deploy the previously running containers back into the cluster. 
    kubectl apply -f prow/cluster/components
  2. Use the following command to bring the previous config back: 
    ./update-config.sh ../prow/config.yaml
  3. Use kubectl get pods to monitor if the pods start.