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Recipe maintainer guide

Package your first recipe

Let's take as an example, Matomo web analytics.

We'll be making a Docker "swarm-mode" compose.yml file.

  • Tired: Write your own image and compose file
  • Wired: Use someone else's image (& maybe compose file)
  • Inspired: Upstream image, someone else's compose file
  • On fire: Upstream compose file

I'm feeling lazy so, luckily for me, Matomo already has an example compose file in their repository.

Like a lot of compose files, it's intended for use with docker-compose, instead of "swarm mode", but it should be a good start.

First, let's create a directory with the files we need:

abra recipe create matomo
cd ~/.abra/apps/matomo

Then, let's download and edit the docker-compose.yml file:

mkdir matomo && cd matomo
wget https://raw.githubusercontent.com/matomo-org/docker/master/.examples/apache/docker-compose.yml -O compose.yml

Open the compose.yml in your favourite editor and have a gander 🦢. There are a few things we're looking for -- full list to come -- but some immediate changes could be:

  1. Let's bump the version to 3.8, to make sure we can use all the latest swarm coolness
  2. We load environment variables separately via abra, so we'll strip out env_file.
  3. The /var/www/html volume definition on L21 is a bit overzealous; it means a copy of Matomo will be stored separately per app instance, which is a waste of space in most cases. We'll narrow it down according to the documentation -- here, the developers have been nice enough to suggest logs and config volumes instead, which is a decent start
  4. The MySQL passwords are sent as variables which is fine for basic use, but if we replace them with Docker secrets we can keep them out of our env files if we want to publish those more widely.
  5. The MariaDB service doesn't need to be exposed to the internet, so we can define an internal network for it to communicate with Matomo.
  6. Lastly, we want to use deploy.labels and remove the ports: definition, to tell Traefik to forward requests to Matomo based on hostname and generate an SSL certificate.

The resulting compose.yml is available here.

Running Co-op Cloud server required!

The rest of this guide assumes you have a Co-op Cloud server going -- we'll use swarm.example.com, but replace it with your own server address.

Head over to the deployment guide if you need help setting one up.

Now, we're ready to create a testing instance of Matomo:

abra app new matomo --secrets \
 --domain matomo.swarm.example.com \
 --server swarm.example.com \
 --app-name mygreatapp

Depending on whether you defined any extra environment variables -- we didn't so far, in this example -- you might want to run abra app mygreatapp config to check the configuration.

Otherwise, or once you've done that, go ahead and deploy the app:

abra app mygreatapp deploy

Then, open the DOMAIN you configured (you might need to wait a while for Traefik to generate SSL certificates) to finish the set-up. Luckily, this container is (mostly) configurable via environment variables -- if we want to auto-generate the configuration we can use a config and / or a custom entrypoint (see coop-cloud/mediawiki for examples of both).

How recipes are versioned

We are still working on stabilising this workflow

We'll use an example to work through this. Let's use Gitea.

The Gitea project maintains a version, e.g. 1.14.3. This version uses the semver strategy for communicating what type of changes are included in each version, i.e., if there is a breaking change, Gitea will release a new version as 2.0.0.

However, there are other types of changes that can happen for a recipe. Perhaps the database image gets a breaking update or the actual recipe configuration changes some environment variable. This can mean that end-users of the recipe need to do some work to make sure their updates will deploy successfully.

Therefore, we maintain an additional version part, in front of the project version. So, the first release of the Gitea recipe in the Co-op Cloud project has the version of 1.0.0+1.14.3-rootless. This x.y.z+ is the version part that the recipe maintainer manages. If a new available Gitea version comes out as 1.15-rootless then the recipe maintainer will publish 1.1.0+1.15-rootless as this is a backwards compatible update, following semantic versioning.

In all cases, we follow the semver semantics. So, if we upgrade the Gitea recipe from 1.14.3-rootless to 1.15.3-rootless, we still publish 1.1.0+1.15.3-rootless as our recipe version. In this case, we skipped a few patch releases but it was all backwards compatible, so we only increment the minor version part.

The commands uses for dealing with this logic in abra are:

  • abra recipe upgrade: upgrade the image tags in the compose configs of a recipe
  • abra recipe tag: publish a git tag for the recipe repo
  • abra recipe sync: upgrade the deploy labels to match the new recipe version

How to publish a new recipe version

Warning

Due to a limitation in the Git library we're using in abra, when tagging new releases, you must use annotated git tags (i.e. git tag -a) or abra won't be able to parse them correctly. On the up side, it is probably better to leave a message with your new Git tag anyway. So maybe this is just "best practice" ;)

This process is very much still a work in progress...

  • abra recipe upgrade keycloak
  • abra recipe sync keycloak "1.0.0+13.0.1"
  • abra recipe release -c --cm "chore: first release" -t "first release" --push

Style guide

  • Please don't use &image YAML repeat anchors on the image: ... key because our recipe release logic does not handle it (see #172)