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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/[email protected]

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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] 1 points 10 months ago

Yep! The names are basically just a convenient way for referencing a user or group ID.

Under normal circumstances you should let the system decide what IDs to use, but in the confined environment of a docker container you can do pretty much what you want.

If you really, really, really want to create a user and group just set the IDs manually:

FROM alpine:latest
COPY myscript.sh /app/myscript.sh
RUN addgroup -g 10001 mycoolgroup && adduser -D -u 10000 -G mycoolgroup mycooluser
USER mycooluser:mycoolgroup
CMD ["sh", "/app/myscript.sh"]

Just make sure to stay at or above 10000 so you won't accidentally re-use IDs that are already defined on the host.