Make UserID and Group ID of www-data match with host

[uchagani]

I'm running Ubuntu 19.10 as my host OS.

I've ran into an issue where the user id and the group id of the www-data user/group are different on my host and in the nextcloud containers. This makes it difficult to move the data directory.

In order to get this to work I had to do the following:

1. Get UID/GID for the www-data user in the nextcloud docker container
2. Create data dir on the host
3. Create a user/group on the host with the UID/GID of the www-data user from the nextcloud docker container (82:82 in my case)
4. Change ownership of the data directory to the user/group created in step 3.
5. recreate the docker-containers

[J0WI]

There's no need to create a user on the host. You can chown 82:82 on the host, chown www-data:www-data in the container (using docker exec) or docker run --user to run the container as custom user.

[rgarrigue]

Why don't you add a UID & GID environment variable defaulting to 33 (default for www-data) to be able to specify the container's data UID & GID ?

It would be way more convenient to integrate with other containers downloading files (like boypt/cloud-torrent for example)

[BlauerPulli]

@J0WI depending on the host setup running the whole container as non-root can lead to other problems (e.g docker socket is not able to bind port 80 / other permission problems). I think it would be a nice feature (besides it seems to be a good practice in other docker projects) to especially set the uid/gid for the user who writes data.

@rgarrigue but this was discussed in two other threads:
#359
#659

and if you need this feature urgently i think you have to implement it.. 😄

[J0WI]

closing due #1812