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132 lines
4.5 KiB
Markdown
132 lines
4.5 KiB
Markdown
Use the Docker plugin to build and push Docker images to a registry.
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The following parameters are used to configure this plugin:
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* `registry` - authenticates to this registry
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* `username` - authenticates with this username
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* `password` - authenticates with this password
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* `email` - authenticates with this email
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* `repo` - repository name for the image
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* `tag` - repository tag for the image
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* `force_tag` - replace existing matched image tags
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* `insecure` - enable insecure communication to this registry
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* `mirror` - use a mirror registry instead of pulling images directly from the central Hub
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* `storage_driver` - use `aufs`, `devicemapper`, `btrfs` or `overlay` driver
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* `save` - save image layers to the specified tar file (see [docker save](https://docs.docker.com/engine/reference/commandline/save/))
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* `file` - absolute / relative destination path
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* `tags` - cherry-pick tags to save (optional)
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* `load` - restore image layers from the specified tar file
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The following is a sample Docker configuration in your .drone.yml file:
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```yaml
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publish:
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docker:
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username: kevinbacon
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password: $$DOCKER_PASSWORD
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email: kevin.bacon@mail.com
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repo: foo/bar
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tag: latest
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file: Dockerfile
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insecure: false
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```
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You may want to dynamically tag your image. Use the `$$BRANCH`, `$$COMMIT` and `$$BUILD_NUMBER` variables to tag your image with the branch, commit sha or build number:
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```yaml
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publish:
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docker:
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username: kevinbacon
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password: $$DOCKER_PASSWORD
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email: kevin.bacon@mail.com
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repo: foo/bar
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tag: $$BRANCH
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```
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Or you may prefer to build an image with multiple tags:
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```yaml
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publish:
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docker:
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username: kevinbacon
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password: $$DOCKER_PASSWORD
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email: kevin.bacon@mail.com
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repo: foo/bar
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tag:
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- latest
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- "1.0.1"
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- "1.0"
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```
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Note that in the above example we quote the version numbers. If the yaml parser interprets the value as a number it will cause a parsing error.
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## Layer Caching
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The Drone build environment is, by default, ephemeral meaning that you layers are not saved between builds. The below example combines Drone's caching feature and Docker's `save` and `load` capabilities to cache and restore image layers between builds:
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```yaml
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publish:
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docker:
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username: kevinbacon
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password: $$DOCKER_PASSWORD
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email: kevin.bacon@mail.com
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repo: foo/bar
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tag:
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- latest
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- "1.0.1"
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load: docker/image.tar
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save:
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destination: docker/image.tar
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tag: latest
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cache:
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mount:
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- docker/image.tar
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```
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You might also want to create a `.dockerignore` file in your repo to exclude `image.tar` from Docker build context:
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```
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docker/*
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```
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In some cases caching will greatly improve build performance, however, the tradeoff is that caching Docker image layers may consume very large amounts of disk space.
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## Troubleshooting
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For detailed output you can set the `DOCKER_LAUNCH_DEBUG` environment variable in your plugin configuration. This starts Docker with verbose logging enabled.
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```yaml
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publish:
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docker:
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environment:
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- DOCKER_LAUNCH_DEBUG=true
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```
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## Known Issues
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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.
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This error occurs when trying to use the default `aufs` storage Driver but aufs is not installed:
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```
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level=fatal msg="Error starting daemon: error initializing graphdriver: driver not supported
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```
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This error occurs when trying to use the `overlay` storage Driver but overlay is not installed:
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```
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level=error msg="'overlay' not found as a supported filesystem on this host.
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Please ensure kernel is new enough and has overlay support loaded."
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level=fatal msg="Error starting daemon: error initializing graphdriver: driver not supported"
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```
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This error occurs when using CentOS or RedHat which default to the `devicemapper` storage driver:
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```
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level=error msg="There are no more loopback devices available."
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level=fatal msg="Error starting daemon: error initializing graphdriver: loopback mounting failed"
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Cannot connect to the Docker daemon. Is 'docker -d' running on this host?
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```
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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](https://github.com/rancher/docker-from-scratch/issues/20).
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