Can't use PUID and GUID

[MariusROBERT]

I tried to setup a minecraft server as non root by providing my PUID and GUID (1000:1000 obtained with id -p $user and id -g $user) but when I start the docker, I get these logs

First start of the docker container, start initialization process.
Starting with 1000:1000 (UID:GID)
fatal: The GID `1000' is already in use.

here's my whole docker-compose

version: "3"

services:
  minecraft:
    image: marctv/minecraft-papermc-server:1.21-111
    restart: always
    container_name: "mcserver"
    environment:
      - MEMORYSIZE=1G
      - PAPERMC_FLAGS=""
      - PUID=1000
      - PGID=1000
    volumes:
      - ./minecraft:/data
    ports:
      - "25565:25565"

I tried to remove the PUID and GUID lines in the docker-compose but it change the ownership of my files and I'd prefer to avoir running my container as root

I tried adding SKIP_PERM_CHECK=true in the env vars but I get a lot of java permission denied error at the server startup resulting in a final crash with red errors

[08:48:44 ERROR]: Failed to start the minecraft server
java.nio.file.AccessDeniedException: ./world/session.lock
[...]

I can provide the whole java logs error logs if needed

[b2un0]

you can only do one of
docker run --user $uid:$gid

OR

add the PUID and GUID as environment variables

Both of them are not possible!

if you run the container with the docker --user argument, you must change the file permissions before with chown and add the SKIP_PERM_CHECK=true env.

https://chatgpt.com/share/679768fa-1970-800e-a353-33dfd84c1d22

[MariusROBERT]

Yes, that's what I did, I put PUID and GUID in the docker-compose.yml (as mentioned in the original post) then built and started it with docker compose up --build -d

[MariusROBERT]

Just tried creating another user only used for this docker and it worked with PUID and PGID, not user: PUID:PGID