Enable Docker garbage collection¶

To avoid unused Docker images and volumes consuming the entire disk space, you can enable a clean-up cron job for old StackLight LMA containers and volumes. By default, the cron job runs daily at 6:00 a.m. and cleans stopped StackLight LMA images and containers that are older than one week.

To enable Docker garbage collection:

1. Open your Git project repository with the Reclass model on the cluster level.

2. In classes/cluster/<cluster_name>/stacklight/server.yml, specify the following parameter:

   _param:
     docker_garbage_collection_enabled: true
   

3. Optional. To change the default parameters, use:

   linux:
     system:
       cron:
         user:
           root:
             enabled: true
       job:
         docker_garbage_collection:
           command: docker system prune -f --filter until=$(date +%s -d "1 week ago")
           enabled: ${_param:docker_garbage_collection_enabled}
           user: root
           hour: 6
           minute: 0
   

4. Log in to the Salt Master node.

5. Apply the following state:

   salt -C 'I@docker:swarm' state.sls linux.system.cron