docker-stack-waiter

docker-stack-waiter

Description

docker-stack-waiter was created to compensate for the missing --detach=false option of the docker stack deploy command, and is specifically built to be part of a CI/CD pipeline.

It monitors the status of the services in a docker-compose.yml file, and waits for them to be completely updated. If any of the services did not exist, docker-stack-waiter will wait for those services to reach the specified number of healthy replicas.

Caveat: Irrespective of this tool, it seems that if a service failes in the paused state due to a task failure, if you run docker stack deploy again without any changes, or if you run docker service update --detach <service_name>, the service will always end up in the completed state, and thus docker-stack-waiter will report the service as successful. A workaround is to set the service's deploy.update_config.failure_action field to rollback.

Installation

Binary

Latest version can be downloaded from here

Docker image

docker container run \
  --rm \
  --mount type=bind,source=/var/run/docker.sock,target=/var/run/docker.sock,readonly \
  --mount "type=bind,source=${PWD},target=${PWD},readonly" \
  --workdir "${PWD}" \
  registry.gitlab.com/almbrand/docker-stack-waiter [-deploy] <namespace>

Usage

Run docker-stack-waiter like this:

docker stack deploy -c docker-compose.yml <namespace> \
&& docker-stack-waiter <namespace>

or

docker-stack-waiter -deploy <namespace>

The -c flag can be specified multiple times. The merged list of service names is used to find the services to wait for.

Environment variables

docker-stack-waiter supports reading the COMPSE_FILE and COMPOSE_PATH_SEPARATOR variables to get the list of Docker Compose files to parse.

Contributing

Issues and merge requests welcome. Please create an issue and create the merge request from that, as it keeps it possible to discuss the issues and their potential solutions separately.

Credits

We basically ported the logic from this GitHub comment by @sorenhansendk to Golang and added a few bits and pieces, so thanks for that.

Authors:

• Sune Keller (@sirlatrom)
• Loke Norlin Johannessen (@ablojh)

License

The project is licensed under the MIT license.