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

Docker creates a .dockerenv file at the root of the directory tree inside container. You can run this script to verify

#!/bin/bash
if [ -f /.dockerenv ]; then
    echo "I'm inside matrix ;(";
else
    echo "I'm living in real world!";
fi

MORE: Ubuntu actually has a bash script: /bin/running-in-container and it actually can return the type of container it has been invoked in. Might be helpful. Don't know about other major distros though.