Some docker commands, I would like to remember

useful-docker-commands.md

Use the current user and his group(s) inside the container:

docker run
  -ti
  --rm
  -u `id -u`
  -v /etc/group:/etc/group
  -v /etc/passwd:/etc/passwd
  alpine
  /bin/sh

If you want to set a specific group my_primary_group as primary group:

docker run
  -ti
  --rm
  -u `id -u`:my_primary_group
  --group-add `id -G | sed "s/ / --group-add /g"`
  -v /etc/group:/etc/group
  -v /etc/passwd:/etc/passwd
  alpine
  /bin/sh