43 lines
2.0 KiB
Markdown
43 lines
2.0 KiB
Markdown
---
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title: 'Maintenance | Update and Cleanup'
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---
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[`containrrr/watchtower`][watchtower-dockerhub] is a service that monitors Docker images for updates, automatically applying them to running containers.
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!!! example "Automatic image updates + cleanup"
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```yaml title="compose.yaml"
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services:
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watchtower:
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image: containrrr/watchtower:latest
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# Automatic cleanup (removes older image pulls from wasting disk space):
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environment:
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- WATCHTOWER_CLEANUP=true
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volumes:
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- /var/run/docker.sock:/var/run/docker.sock
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```
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!!! tip "Updating only specific containers"
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The default `watchtower` service will check every 24 hours for any new image updates to pull, **not only the images** defined within your `compose.yaml`.
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The images to update can be restricted with a custom command that provides a list of containers names and other config options. Configuration is detailed in the [`watchtower` docs][watchtower-docs].
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!!! info "Manual cleanup"
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`watchtower` also supports running on-demand with `docker run` or `compose.yaml` via the `--run-once` option.
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You can also directly invoke cleanup of Docker storage with:
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- [`docker image prune --all`][docker-docs-prune-image]
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- [`docker system prune --all`][docker-docs-prune-system] (_also removes unused containers, networks, build cache_).
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- Avoid the `--all` option to only remove ["dangling" content][docker-prune-dangling] (_eg: Orphaned images_).
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[watchtower-dockerhub]: https://hub.docker.com/r/containrrr/watchtower
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[watchtower-cleanup]: https://containrrr.github.io/watchtower/arguments/#cleanup
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[watchtower-docs]: https://containrrr.dev/watchtower/
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[docker-docs-prune-image]: https://docs.docker.com/engine/reference/commandline/image_prune/
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[docker-docs-prune-system]: https://docs.docker.com/engine/reference/commandline/system_prune/
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[docker-prune-dangling]: https://stackoverflow.com/questions/45142528/what-is-a-dangling-image-and-what-is-an-unused-image/60756668#60756668
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