this post was submitted on 21 Sep 2025
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In linux user and group names don't matter. Only the gid and uid matter. Think of user and group names as human names like domains are for IPS.
In docker when you use mounts, all your containers that want to share data must agree on the gid and uids.
In rootless docker and podman the subuids and subgids make it a little more complicated since IDs get mapped between host and container, but its still the IDs that matter.
I have one .env file with UUID/GUID 1000 set for all docker services in the docker-compose so it would make sense in theory if that's enough, but it seems it rarely is...