Docker logs size should be limited

[sgoumaz]

Currently we run with the Docker daemon defaults, and logs have eaten up system volumes on Addmin's machines.

Proposed solution:

• Add a new "common" docker-compose file to be invoked together with each specific file (docker-compose merges them)
• In that file specify the logging options that limit file size and number (see reference), and assign those to a YAML anchor
• Refer to the created anchor for each service in all the existing docker-compose files

Alternative: set global Docker daemon setting in /etc/docker/daemon.json:

{
  "log-driver": "json-file",
  "log-opts": {"max-size": "10m", "max-file": "1"}
}

Q: did we decide to use the "local" driver instead? (JSON is default and recommended to use log contents elsewhere, but local is smaller and faster)

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⚠️ after changing the config, containers have to be recreated for the new settings to be used; one way to do it is with docker-compose up --force-recreate

[sgoumaz]

@perki OK to fix this by setting log config globally via /etc/docker/daemon.json? It's fine for machines running only Pryv, potentially not on others but probably no one mixes stuff on their machines?

[perki]

@sgoumaz as a quick fix, yes.
For our distribution we could add it directly in our configs so there is no extra Manuel config step for our customers. What do you think?

[sgoumaz]

We initially planned to add it to each of our configs (as described above), but supposing no one mixes services on their machines it looks much simpler (for everyone) IMO to set it globally and automatically as part of the setup, no extra step involved…?