drone-docker-buildx/DOCS.md

Use the Docker plugin to build and push Docker images to a registry. The following parameters are used to configure this plugin:

• registry - authenticates to this registry
• username - authenticates with this username
• password - authenticates with this password
• email - authenticates with this email
• repo - repository name for the image
• tag - repository tag for the image
• insecure - enable insecure communication to this registry
• storage_driver - use aufs, devicemapper, btrfs or overlay driver

The following is a sample Docker configuration in your .drone.yml file:

publish:
  docker:
    username: kevinbacon
    password: $$DOCKER_PASSWORD
    email: kevin.bacon@mail.com
    repo: foo/bar
    tag: latest
    file: Dockerfile
    insecure: false

You may want to dynamically tag your image. Use the $$BRANCH, $$COMMIT and $$BUILD_NUMBER variables to tag your image with the branch, commit sha or build number:

publish:
  docker:
    username: kevinbacon
    password: $$DOCKER_PASSWORD
    email: kevin.bacon@mail.com
    repo: foo/bar
    tag: $$BRANCH

Or you may prefer to build an image with multiple tags:

publish:
  docker:
    username: kevinbacon
    password: $$DOCKER_PASSWORD
    email: kevin.bacon@mail.com
    repo: foo/bar
    tag:
      - latest
      - "1.0.1"
      - "1.0"

Note that in the above example we quote the version numbers. If the yaml parser interprets the value as a number it will cause a parsing error.

Troubleshooting

For detailed output you can set the DOCKER_LAUNCH_DEBUG environment variable in your plugin configuration. This starts Docker with verbose logging enabled.

publish:
  docker:
    environment:
      - DOCKER_LAUNCH_DEBUG=true

Known Issues

There are known issues when attempting to run this plugin on CentOS, RedHat, and Linux installations that do not have a supported storage driver installed. You can check by running docker info | grep 'Storage Driver:' on your host machine. If the storage driver is not aufs or overlay you will need to re-configure your host machine.

This error occurs when trying to use the default aufs storage Driver but aufs is not installed:

level=fatal msg="Error starting daemon: error initializing graphdriver: driver not supported

This error occurs when trying to use the overlay storage Driver but overlay is not installed:

level=error msg="'overlay' not found as a supported filesystem on this host.
Please ensure kernel is new enough and has overlay support loaded." 
level=fatal msg="Error starting daemon: error initializing graphdriver: driver not supported"

This error occurs when using CentOS or RedHat which default to the devicemapper storage driver:

level=error msg="There are no more loopback devices available." 
level=fatal msg="Error starting daemon: error initializing graphdriver: loopback mounting failed" 
Cannot connect to the Docker daemon. Is 'docker -d' running on this host?

The above issue can be resolved by setting storage_driver: vfs in the .drone.yml file. This may work, but will have very poor performance as discussed here.