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On the host, you can run $ socat unix:<path-to-container>/var/lib/login.socket -,echo=0,raw to get a login prompt. So this allows logging in even if the container has no SSH access enabled. You can also do $ socat unix:<path-to-container>/var/lib/root-shell.socket - to get a plain root shell. (This socket is only accessible by root, obviously.) This makes it easy to execute commands in the container, e.g. $ echo reboot | socat unix:<path-to-container>/var/lib/root-shell.socket -