Pass-through the NVIDIA card in a LXC container

Pass-through the NVIDIA card to be used in the LXC container is simple enough and there are three simple rules to watch for:

  • mount bind the NVIDIA devices in /dev to the LXC container’s /dev
  • Allow cgroup access for the bound /dev devices.
  • Install the same version of the NVIDIA driver/software under the host and the LXC container or there will be multiple errors of the sort – version mismatch

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When using the LXC container pass-through, i.e. mount bind, the video card may be used simultaneously on the host and on all the LXC containers where it is mount bind. Multiple LXC containers share the video device(s).

This is a working LXC 4.0.12 configuration:

# Distribution configuration
lxc.include = /usr/share/lxc/config/common.conf
lxc.arch = x86_64

# Container specific configuration
lxc.rootfs.path = dir:/mnt/storage1/servers/gpu1u/rootfs = gpu1u

# Network configuration = macvlan = enp1s0f1 = bridge = up = eth0 = fe:77:3f:27:15:60

# Allow cgroup access
lxc.cgroup2.devices.allow = c 195:* rwm
lxc.cgroup2.devices.allow = c 234:* rwm
lxc.cgroup2.devices.allow = c 237:* rwm

# Pass through device files
lxc.mount.entry = /dev/nvidia0 dev/nvidia0 none bind,optional,create=file
lxc.mount.entry = /dev/nvidia1 dev/nvidia1 none bind,optional,create=file
lxc.mount.entry = /dev/nvidia2 dev/nvidia2 none bind,optional,create=file
lxc.mount.entry = /dev/nvidia3 dev/nvidia3 none bind,optional,create=file
lxc.mount.entry = /dev/nvidiactl dev/nvidiactl none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-uvm dev/nvidia-uvm none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-modeset dev/nvidia-modeset none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-uvm-tools dev/nvidia-uvm-tools none bind,optional,create=file
lxc.mount.entry = /dev/nvidia-caps dev/nvidia-caps none bind,optional,create=dir

# Autostart = onboot = 1
lxc.start.delay = 10

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Install CUDA and NVIDIA video driver under CentOS 7

Nvidia CUDA Toolkit supports CentOS 7 and it is relatively simple to install it. Nvidia provides three types of installation – a big setup file, a big rpm file and an official Nvidia repository, which we are going to use it in this article. The Nvidia repository contains the Nvidia video driver for the Nvidia video cards like GeForce, GTX, RTX and so on. You may need CUDA Toolkit if you are a game developer or you want to build yourself some of the mining software like XMR-STAK.
In this article, we are going to use the NVIDIA official repository for CUDA and the video driver module. There are other ways to install CUDA, which are not the purpose of this article. Using an official repository is the best practice for installing software on your system.

STEP 1) Update and install the NVIDIA official repository.

yum update -y
yum install -y yum-utils
yum-config-manager --add-repo

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