docker-mailserver/docs/content/advanced/maintenance/update-and-cleanup.md
polarathene 021e942c4c docs(refactor): Large refactor + additions + fixes
Consistency pass, formatting cleanup and fixes, introduce admonitions, add front-matter.

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docs: Add front-matter

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docs: Fix and format links

- Some links were invalid (eg files moved or renamed)
- Some were valid but had invalid section headers (content removed or migrated)
- Some use `http://` instead of `https://` when the website supports a secure connection.
- Some already used the `[name][reference]` convention but often with a number that wasn't as useful for maintenance.
- All referenced docs needed URLs replaced. Opted for the `[name][reference]` approach to group them all clearly at the bottom of the doc, especially with the relative URLs and in some cases many duplicate entries.
- All `tomav` references from the original repo prior to switch to an organization have been corrected.
- Minor cosmetic changes to the `name` part of the URL, such as for referencing issues to be consistent.
- Some small changes to text body, usually due to duplicate URL reference that was unnecessary (open relay, youtous)
- Switched other links to use the `[name][reference]` format when there was a large group of URLs such as wikipedia or kubernetes. Github repos that reference projects related to `docker-mailserver` also got placed here so they're noticed better by maintainers. This also helped quite a bit with `mermaid` external links that are very long.
- There was a Github Wiki supported syntax in use `[[name | link]]` for `fetchmail` page that isn't compatible by default with MkDocs (needs a plugin), converted to `[name][reference]` instead since it's a relative link.

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docs: Update commit link for LDAP override script

Logic moved to another file, keeping the permalink commit reference so it's unaffected by any changes in the file referenced in future.

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docs: Heading corrections

Consistency pass. Helps with the Table of Contents (top-right UI) aka Document Outline.
docs: codefence cleanup

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docs: misc cleanup

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docs: Add Admonitions

Switches `<details>` usage for collapsible admonitions (`???`) while other text content is switched to the visually more distinct admoniton (`!!!` or `???+`) style.

This does affect editor syntax highlighting a bit and markdown linting as it's custom non-standard markdown syntax.
2021-03-25 11:49:24 +13:00

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1.3 KiB
Markdown

---
title: 'Maintenance | Update and Cleanup'
---
## Automatic Update
Docker images are handy but it can get a a hassle to keep them updated. Also when a repository is automated you want to get these images when they get out.
One could setup a complex action/hook-based workflow using probes, but there is a nice, easy to use docker image that solves this issue and could prove useful: [`watchtower`](https://hub.docker.com/r/containrrr/watchtower).
A docker-compose example:
```yaml
services:
watchtower:
restart: always
image: containrrr/watchtower:latest
volumes:
- /var/run/docker.sock:/var/run/docker.sock
```
For more details, see the [manual](https://containrrr.github.io/watchtower/)
## Automatic Cleanup
When you are pulling new images in automatically, it would be nice to have them cleaned up as well. There is also a docker image for this: [`spotify/docker-gc`](https://hub.docker.com/r/spotify/docker-gc/).
A docker-compose example:
```yaml
services:
docker-gc:
restart: always
image: spotify/docker-gc:latest
volumes:
- /var/run/docker.sock:/var/run/docker.sock
```
For more details, see the [manual](https://github.com/spotify/docker-gc/blob/master/README.md)
Or you can just use the [`--cleanup`](https://containrrr.github.io/watchtower/arguments/#cleanup) option provided by `containrrr/watchtower`.