Ubuntu – How to run a Snappy / ubuntu-core image with LXD

Basically the answer is that -

1. You need to bind mount the host devices you want to access eg.

   mount --bind /dev/dvb /path_to_your_container/rootfs/dev/dvb

.... remember to create the target directory first

2. Ensure you're either using a privileged container or you have granted the host's owner of an unprivileged container access to the device(s) you mounted above
3. Add the relevant cgroup entry in your container config file (or /etc/lxc/lx.conf for all privileged containers) ie. lxc.cgroup.devices.allow = c xxx:* rwm where xxx = the "major" part of the major:minor id found using ls -la /dev/dvb say ..... 212 for DVB or 189 for USB (on my system), thus for my case, dvb access is granted via lxc.cgroup.devices.allow = c 212:* rwm

Apparmor changes are unnecessary .. the bind mount and cgroup entry were sufficient to enable container access to DVB devices (which happen to be USB devices BUT it was not necessary to enable access to "USB" devices as well ... just the DVB devices in /dev/dvb)

So there are multiple ways you can do so, either directly for a container:

lxc init ubuntu: CONTAINER
lxc config set CONTAINER user.user-data - < cloud-init-config.yml
lxc start CONTAINER

Or even shorter:

lxc launch ubuntu: CONTAINER --config=user.user-data="$(cat cloud-init-config.yml)"

Or through a profile:

lxc profile create dev
lxc profile set dev user.user-data - < cloud-init-config.yml
lxc launch ubuntu: CONTAINER -p default -p dev