How to start an LXC container inside a Docker container

Question

How do I start a LXC container inside of a docker container - end to end - with shared networking? Ideally I'd like to do this with Debian or Ubuntu. Some problems I found when trying to do this:

• lxc-net doesn't start when installed into a Docker container, so the lxcbr0 bridge never gets created. Partial workaround is to manually create the bridge.
• lxc containers fail to start to due to cgroupfs failed to detect cgroup metadata, even if I manually mount a cgroup via mount -n -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup

Answer 1

Take a look at the --privileged flag to your docker container docs