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Uid/gid in docker containers don't match the uid/gid on the server? (feddit.it)

submitted 10 months ago by [email protected] to c/selfhosted

18 comments fedilink hide all child comments

Installed a new debian server, installed docker, but then now i have a problem with permissions on passed directories.

On the previous server, the uid/gids inside the docker container match the uid/gid on the real server.

Root is 0, www-data is 33, and so on.

On this new server, instead, files owned by root (0) in the container are translated to 1000 on the server, www-data (33) is 100032, and so on (+1000 appended to the uid)

Is this normal or did I misconfigure something? On the previous server I was running everything as root (the interactive user was root), and i would like to avoid that

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[–] [email protected] 7 points 10 months ago (1 children)

checked .bash_history, looks like i installed docker in the new rootless mode

wget get.docker.com
ls
mv index.html docker.sh
chmod +x docker.sh
./docker.sh
dockerd-rootless-setuptool.sh install
sudo dockerd-rootless-setuptool.sh install
sudo apt install uidmap
dockerd-rootless-setuptool.sh install

now i need to see how to restore it to work in the traditional way or i will become crazy with the permissions...

[–] [email protected] 5 points 10 months ago (1 children)

I fixed it:

for future reference:

from https://docs.docker.com/engine/security/rootless/#uninstall, run dockerd-rootless-setuptool.sh uninstall
delete the user data (warning: i wasn't using any docker volumes and i had no data to lose!!!) using the command that the previous script tells you
add your user to the docker group and use the traditional "run docker as root" way: https://docs.docker.com/engine/install/linux-postinstall/#manage-docker-as-a-non-root-user

[–] [email protected] 8 points 10 months ago (1 children)

Why go through all of that complexity when you could just sudo apt install docker?

[–] [email protected] 0 points 10 months ago (2 children)

i don't want to type sudo before each single docker command

[–] [email protected] 14 points 10 months ago* (last edited 10 months ago) (1 children)

You can do that with regular docker. Just add your user to the docker group.

(don't forget to log out and log in again after adding new groups to your user)

[–] [email protected] 4 points 10 months ago (1 children)

Niche use case, but you can also use newgrp to run commands with a recently-added group to your user, without having to logout/login yet.

[–] [email protected] 1 points 10 months ago

Or start a new session by typing bash, when already in bash.

[–] [email protected] 5 points 10 months ago

So add your user to the new docker group made on install of that package and you'll be able to docker without sudo. You may need to relogin or newgrp docker before it works tho