In the traditional CentOS container, if you want to use systemctl, you will encounter the following situations
The system prompts you that you cannot use systemctl because the current system is not booted by systemd
Therefore, it is not difficult to understand why the following commands can use systemctl
docker run -itd --name=centos --privileged=true centos /usr/sbin/init
But relatively speaking, the situation of Ubuntu will be more trouble
docker run -i -t -d --name ubuntu --privileged -v /run/systemd/system:/run/systemd/system -v /bin/systemctl:/bin/systemctl -v /var/run/dbus/system_bus_socket:/var/run/dbus/system_bus_socket -it ubuntu systemctl
