Run Firefox with GUI inside a container
git clone https://github.com/cslev/docker_firefox
Do it on your own, many sources are available via Google
cd docker_firefox
sudo docker build -t docker_firefox .
Here, we need to pass some local X11 variables and files to the container to make it able to run GUI apps
sudo docker run --net=host --env="DISPLAY" --volume="$HOME/.Xauthority:/root/.Xauthority:rw" docker_firefox /docker_firefox/firefox/firefox
If Firefox does not show up, run any other x11-apps (for testing) or xterm and run firefox within xterm.
$ sudo docker run --net=host --env="DISPLAY" --volume="$HOME/.Xauthority:/root/.Xauthority:rw" docker_firefox xterm
in xterm:
$ /docker_firefox/firefox/firefox
By defining --net=host, we let our container to see the root networking namespace, which is not always the case we want. However, for accessing all X11 sockets it is important, but there is a workaround.
Now, let's assume a bit more extreme case where we don't want any docker networking at all as we will connect it manually, say, to an Open vSwitch.
sudo docker run -dit --name=docker_firefox --net=none -e DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix -v $HOME/.Xauthority:/root/.Xauthority --hostname $(hostname) cslev/docker_firefox:selenium "xterm -fn 10x20"
For simplicity, here we start an xterm where you can start your firefox from! Use the previous command's path to firefox if you want to start it first.
There are good descriptions and comments here