Docker (software): Difference between revisions
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===Compose file=== | ===Compose file=== | ||
See | See [https://docs.docker.com/compose/compose-file/compose-file-v3/ Compose file specification]. | ||
Previously, the Compose file (<code>docker-compose.yml</code>) required a version. Version 2 and version 3 had different options and not all options from version 2 were available in version 3. However, as of docker-compose v1.27+, you should no longer specify a version and options from both versions are supported. | Previously, the Compose file (<code>docker-compose.yml</code>) required a version. Version 2 and version 3 had different options and not all options from version 2 were available in version 3. However, as of docker-compose v1.27+, you should no longer specify a version and options from both versions are supported. | ||
{{hidden | Example docker-compose.yml | | {{hidden | Example docker-compose.yml | | ||
<syntaxhighlight lang="yaml"> | <syntaxhighlight lang="yaml"> | ||
services: | services: | ||
web: | web: | ||
image: registry.gitlab.davidl.me/dli7319/davidl_me:latest | image: registry.gitlab.davidl.me/dli7319/davidl_me:latest | ||
restart: unless-stopped | |||
</syntaxhighlight> | </syntaxhighlight> | ||
}} | |||
==Accessing the Host== | ==Accessing the Host== | ||
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* You do not need to add <code>expose</code>. | * You do not need to add <code>expose</code>. | ||
By default, networks are allocated with ip ranges: | |||
* 172.17.0.0/12 with size /16 | |||
* 192.168.0.0/16 with size /20 | |||
If you want this to be more consistent, you can change it as follows: | |||
Set the following in <code>/etc/docker/daemon.json</code>: | Set the following in <code>/etc/docker/daemon.json</code>: | ||
<syntaxhighlight lang="json"> | <syntaxhighlight lang="json"> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
Then restart your docker: <code>sudo systemctl restart docker</code> and prune networks <code>docker network prune</code>.<br> | Then restart your docker: <code>sudo systemctl restart docker</code> and prune networks <code>docker network prune</code>.<br> | ||
Next, in your firewall, allow connections to your localhost from 172.16.0.0/12. | Next, in your firewall, allow connections to your localhost from 172.16.0.0/12. | ||
<pre> | <pre> | ||
ufw allow from 172.16.0.0/12 to any comment "from_docker" | ufw allow from 172.16.0.0/12 to any comment "from_docker" | ||
</pre> | </pre> | ||
==Registries== | ==Registries== | ||
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Alternative public registries: | Alternative public registries: | ||
* [https://gallery.ecr.aws/ AWS ECR Gallery] has a mirror for all official docker containers. | * [https://gallery.ecr.aws/ AWS ECR Gallery] has a mirror for all official docker containers. | ||
==Caching== | |||
If you want your builds to be fast on CICD, you have to setup [https://docs.docker.com/build/cache/ caching]. | |||
In particular you should: | |||
* Enable [https://docs.docker.com/build/buildkit/ buildkit] by setting the environment variable <code>DOCKER_BUILDKIT=1</code> | |||
* Use <code>--cache-from</code> in your build. | |||
* Setup external caching, e.g. with <code>--build-arg BUILDKIT_INLINE_CACHE=1</code>. | |||
** Use <code>--arg BUILDKIT_INLINE_CACHE=1</code> if using <code>docker buildx build</code>. | |||
* For multistage builds, cache each stage in your container registry. | |||
;Resources | |||
* https://michalwojcik.com.pl/2021/01/21/using-cache-in-multi-stage-builds-in-gitlab-ci-docker/ | |||
* https://testdriven.io/blog/faster-ci-builds-with-docker-cache/#multi-stage-builds | |||
==Useful Services== | |||
* [https://containrrr.dev/watchtower/ https://containrrr.dev/watchtower/] is a tool which will automatically update your docker containers when new images are published. It also has an http endpoint to trigger checks manually e.g. from CI/CD. | |||
==My Images== | |||
I have a few custom container images below: | |||
* [https://github.com/dli7319/docker-anki-server ghcr.io/dli7319/docker-anki-server:main] | |||
* [https://github.com/dli7319/docker-nextcloud ghcr.io/dli7319/docker-nextcloud:main] | |||
* [https://github.com/dli7319/docker-mediawiki ghcr.io/dli7319/docker-mediawiki:main] | |||
==Resources== | ==Resources== | ||
* [https://www.youtube.com/watch?v=fqMOX6JJhGo freeCodeCamp.org Docker Tutorial for Beginners Video] | * [https://www.youtube.com/watch?v=fqMOX6JJhGo freeCodeCamp.org Docker Tutorial for Beginners Video] | ||