====== 2022-01-30 - X11 forwarding to docker container ======

sometime ago i had an issue with X11 forwarding for containers. for quite some time i just used setup SSHd in container and X11 forward via SSH. later on things improved. in fact my [[blog:2021:12:15:2021-12-15_-_containerized_steam|steam containerization]] efforts did use that approach, yet it was not exposed, so maybe it would be good to point it out explicitly.

the spell is:
<code bash>
docker run \
  -it \
  -rm \
  -u "$(id -u):$(id -g)" \
  -e DISPLAY \
  -v /tmp/.X11-unix:/tmp/.X11-unix \
  "your_image_with_x11_app"
</code>

so the key thing is to forward ''DISPLAY'' variable and path to X11 socket file. simple and straight forward... once you spent enough time on the net googling for quirks. ;)

btw: for QT-based applications you may also want to pass ''-e QT_X11_NO_MITSHM=1'', to disabled shared memory usage.