Derp.sh

$ docker run -t centos:7 /usr/lib/systemd/systemd --system
^C
$ docker ps -a
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                    PORTS               NAMES
3ce1f1998396        centos:7            "/usr/lib/systemd/..."   28 seconds ago      Up 27 seconds                                 musing_kare
$ docker exec -it musing_kare /bin/bash
[root@3ce1f1998396 /]# yum install openssh-server
<snip>
[root@3ce1f1998396 /]# systemctl start sshd.service