In this first section I detail some of the terms I have used:
Dockerized graphical applications: A Docker container run from a Docker image which runs an application which (traditionally) uses x11 (or similar) to display the application on the host machine. More details in second section.
packages required for display remotely on clients: For example, a VNC server which allows a user of a local client (e.g. a laptop with desktop Ubuntu 18.04 installed) to navigate through the browser to an particular host-name and port.
In this second section I give an example of the usual way to run a Dockerized application, using gedit as an example:
FROM ubuntu:18.04 RUN apt-get update && apt-get install -y gedit CMD gedit
Example Docker build command:
docker build -t gedit:latest .
Example Docker run command:
Once-off (can potentially be a harmful command, use with caution):
docker run --rm --name=gedit -e DISPLAY=$DISPLAY -v /tmp/.X11-unix/:/tmp/.X11-unix gedit:latest
Please note: There are some security concerns running
xhost +local:docker so to reverse this run
Sub-question / curiosity: The above installs x11, etc into the image. Is there any way to have a separate image with all of those dependencies and have multiple containers share folders in order to satisfy the x11 dependencies?
In this third section I detail an example in which my question is relevant:
I want to keep the Dockerized app as explained in section 2, which runs well locally on a client's laptop but have it as part of a cluster of docker containers (using docker-compose for example) so that the image built from the dockerfile in section 2 is unmodified.
I want to include an additional container which has all the VNC and x11 packages required so that the client can run the application remotely.
Which mechanisms allow the above to take place?