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RELEASE.md

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Releasing a New Version

This document describes how to release a new set of Docker images for OpenZipkin. The images are built automatically on quay.io and mirrored to Docker Hub.

Tag structure

Each release is tagged with a semantic version number like 1.1.4. The Docker tags 1.4 and 1 point to the latest tag under them, to let users choose the level of version pinning they prefer.

Release using Travis (recommended)

  1. Create, push a tag release-1.1.4

    This triggers a Travis job on openzipkin/docker-zipkin that just takes care of everything, except for:

  2. Test the new images

    Execute docker-compose pull then docker-compose up, and verify that all is well with the world. Ex make sure the /info url matches the version you pushed.

  3. There is no step four

    Congratulations, the intersection of the sets (OpenZipkin users) and (Docker users) can now enjoy the latest and greatest Zipkin release!

Release manually (not recommended)

  1. Get a Quay.io OAuth 2 token

    Go to https://quay.io/organization/openzipkin/application/QREQHLDQGW2LI4OGGD6C?tab=gen-token and generate a token with "Read/Write to any accessible repositories" permissions. Export this token to be used by the release script: export QUAYIO_OAUTH2_TOKEN='...'

    This token will be used to sync up the Docker tags 1 and 1.4 when you release 1.1.4.

  2. Activate your Docker environment

    Make sure you have $DOCKER_HOST and friends set. The easiest way to check this is to run docker version, which will print the version of your Docker daemon as well as your server. For many people, eval $(docker-machine env dev) or some slight variation will take care of this.

  3. Log in to Docker Hub

    Make sure your Docker client configuration has your credentials to hub.docker.com. The easiest way to get this right is to issue the command docker login and enter your credentials.

    This will be used when syncing the built images from Quay.io to Docker Hub.

  4. Run release.sh $RELEASE_TAG

    RELEASE_TAG should be a semantic version number prefixed by release-, like release-1.1.4. Go grab a coffee.

    The script will create a Git tag 1.1.4 that triggers the builds. It waits for those, then syncs up the Docker tags 1 and 1.4 to the Docker tag 1.1.4 created by these builds. Finally it syncs the built images to Docker Hub.

  5. Test the new images

    Locally change docker-compose.yml to use the newly built versions, say docker-compose up, and verify that all is well with the world. TBD: How exactly do we do that?

  6. Commit, push docker-compose.yml

  7. Done!

    Congratulations, you're done!

What happens inside release.sh?

Assume we're releasing 1.1.4.

  • The ENV var ZIPKIN_VERSION in any Dockerfiles that reference it is updated, committed and pushed
  • The tag 1.1.4 is created and pushed. The quay.io repositories for images (zipkin-cassandra, zipkin-collector, zipkin-kafka, zipkin-slim and zipkin) are configured to trigger a build on tags that look match \d+\.\d+\.\d+.
  • The script waits for the build of each build to start (timeout 5 minutes) and finish (no timeout) using the quay.io API to poll for them. It does this one by one for each build, so usually there's only any waiting for the first image; the rest are also about done by the time that's finished.
  • The tags 1, 1.4, 1.1.4 for the services are synced to Docker Hub by pulling them from quay.io using the docker CLI and pushing them to Docker Hub.
  • A friendly message is printed to remind the release manager (HAH! Such words.) about manually testing the release and updating the tags in docker-compose.yml. This last part could definitely use more automation.