9.5. Controlling systemd on a Remote Machine

In addition to controlling the systemd system and service manager locally, the systemctl utility also allows you to interact with systemd running on a remote machine over the SSH protocol. Provided that the sshd service on the remote machine is running, you can connect to this machine by running the systemctl command with the --host or -H command line option:
systemctl --host user_name@host_name command
Replace user_name with the name of the remote user, host_name with the machine's host name, and command with any of the systemctl commands described above. Note that the remote machine must be configured to allow the selected user remote access over the SSH protocol. For more information on how to configure an SSH server, see Chapter 10, OpenSSH.

Example 9.16. Remote Management

To log in to a remote machine named server-01.example.com as the root user and determine the current status of the httpd.service unit, type the following at a shell prompt:
~]$ systemctl -H root@server-01.example.com status httpd.service
>>>>>>> systemd unit files -- update
root@server-01.example.com's password:
httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
   Active: active (running) since Fri 2013-11-01 13:58:56 CET; 2h 48min ago
 Main PID: 649
   Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"
   CGroup: /system.slice/httpd.service