How to get KVM working in LXD Container

LXD
3

Good morning

Thanks for your time… yes, you’re correct… inexperience and other things going on that appeared that this was the issue.

So I see what would be a simple guide to get KVM VMs running in a LXD Ubuntu 20.04 AMD64 unprivileged container:

  • create a standard ubuntu 20.04 AMD64 container (lxc launch ubuntu:20.04/amd64 {ContainerName})
  • allow virtualisation nesting ( lxc config set {ContainerName} security.nesting true)
  • open shell in the container (lxc exec {ContainerName} -- bash)
  • in the container shell, install qemu-kvm (apt update && apt install qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils)
  • in the container shell, edit “/etc/libvirt/qemu.conf” and set “remember_owner = 0” # to get around the issue in this article for unprivileged containers
  • in the container shell, get the gid of the kvm group (getent group kvm) # not sure this is still needed
  • on the host shell, to the container’s config, add the kvm device with the gid of the kvm group discovered above (lxc config device add {ContainerName} kvm unix-char path=/dev/kvm gid=???)
  • restart the container (lxc restart {ContainerName})
  • start creating VMs in KVM.