Setting up GPU-accelerated containers under Funtoo Linux is quite easy. In this example, we will set up a multilib Gentoo container with the ability to access the host GPU.
First, let's launch a Gentoo container. By default, LXD configures the remote
images: to point to https://images.linuxcontainers.org, and this site hosts Gentoo Linux images. Let's create one as follows:
root # lxc launch images:gentoo gentoo-gpu-test Creating gentoo-gpu-test Starting gentoo-gpu-test
Now, let's enter the container and perform an
emerge --sync. We will then configure our container to use Intel GPU acceleration, which is what we are using on our host, and we will emerge xorg-x11:
root # lxc exec gentoo-gpu-test -- su --login gentoo-gpu-test # emerge --sync gentoo-gpu-test # echo 'VIDEO_CARDS="intel i915 i965"' >> /etc/portage/make.conf gentoo-gpu-test # emerge -auDN @world xorg-x11 --jobs
Once this completes, we are close to having GPU acceleration but need to perform a few more steps.
Video Card Specifics
If you are using an NVIDIA graphics card, you will want to set
nvidia above. You will also need to allow all local users to access your GPU, not just the
video user, by setting
/etc/modprobe.d/nvidia.conf and rebooting. Note that in the future, there will likely be a better solution to this but
for now, the host's device nodes are mapped into the container which runs using very high UIDs/GIDs for the root user and this
user needs to be able to access your GPU's device nodes.
On your regular system (which we will refer to as your "host", since it "hosts" the containers), you will want to inspect
the setting of your
DISPLAY environment variable:
user $ echo $DISPLAY :1
We will want to set the container to use this value. We will also want to add a GPU to our container configuration. Run the following command on the host to edit the container's configuration.
root # lxc config edit gentoo-gpu-test
You will be presented with a YAML file which contains the configuration for the container. You will want to modify the container configuration to add the
as well as copy the
devices: section in the container configuration snippet below. Note that you should keep all the existing configuration that is in your YAML, and do not wipe your config and paste what is below -- I'm including just the relevant parts to keep things easy-to-read:
architecture: x86_64 config: environment.DISPLAY: :1 image.architecture: amd64 image.description: Gentoo current amd64 (20190717_17:39) image.os: Gentoo devices: X11-unix: path: /tmp/.X11-unix source: /tmp/.X11-unix type: disk mygpu: type: gpu ephemeral: false
Now your container is configured to use the host's GPU! All you need to do is run the following command as your regular user on your regular system to allow X connections from the container to your host:
user $ xhost +local:
xhost command will only be active until your system reboots, and will allow local connections to talk to your X server.
You can now proceed to test use of OpenGL in the container:
root # lxc exec gentoo-gpu-test -- su --login gentoo-gpu-test # emerge -av --jobs mesa-progs gentoo-gpu-test # echo $DISPLAY :1 gentoo-gpu-test # glxgears
You should be presented with a
glxgears window, running within your container, but being displayed on your X server. Congratulations -- you now have accelerated OpenGL within a container!