How to determine if a process runs inside lxc/Docker?

Question

Is there any way to determine if a process (script) runs inside an lxc container (~ Docker runtime)? I know that some programs are able to detect whether they run inside a v

Answer 1

On a new ubuntu 16.04 system, new systemd & lxc 2.0

sudo grep -qa container=lxc /proc/1/environ