That’s not a particularly easy process right now.
You’d need to:
- Make sure that SELinux is enabled on the host
- Use a block based storage type for your containers
- Use block.mount_options as a way to pass the SELinux labels for the container filesystem
@mschiff has been doing a bunch of work related to that on Gentoo, you can find more details here Unable to add lxc rootfs mount options (context=)