Is it possible to always automatically update the Docker image to the latest version (I use nextcloud:stable)? Is there anything else to do besides the image update? Should one issue “occ upgrade” before updateing the docker image (or maybe after)? I guess not, because occ upgrade is part of entrypoint.sh in the Docker image.
What is the best strategy to automatically keep Nextcloud up to date?
Generally for the update, if you’re not using any custom images, all that’s needed is:
docker compose pull
docker compose up -d
You can script it and put it in cron if you’re okay with the risks. You’ll periodically have to run a command or two in occ as prompted on the settings screen.
One other thing I would add is that you’ll start to get a pile-up of old Docker images. You can remove them with:
docker image prune
I don’t remember if that command might prompt for confirmation, so be sure to check when scripting.
Also, you may want to consider only auto-upgrading minor versions. If you change your tag to something like nextcloud:24 then it won’t upgrade to 25 until you update the config. That would give you a little more control over the major version upgrades.
Watchtower can keep it up to date for you. It runs in a container alongside other containers you wish to keep automatically updated.
And you’re correct that it is not necessary to manually run occ upgrade with your setup.