The sshd daemon by OpenSSH provides the SSH server service for most platforms. Most Unix-based operating systems use systemd, System V. Init scripts, or the service command to manage system services. You can use all three methods to manage your SSH server service on most platforms.

Standard options for these methods include starting, stopping, and restarting services. You can also view the detailed status of the running sshd daemon and set whether to automatically start sshd during system startup.

MethodCommand
System V. Init scripts /etc/init.d/ssh [start|restart|stop|status]
Systemd systemctl [start|restart|stop|status|enable|disable] ssh
service command service ssh [start|restart|stop|status]

Some distributions use sshd instead of ssh as the name of their init script.

Steps to manage OpenSSH server from command line:

  1. Stop SSH service using service command.
    $ sudo service ssh stop
  2. Start SSH service using systemd.
    $ sudo systemctl start ssh
  3. Configure SSH to automatically start during system boot.
    $ sudo systemctl enable ssh
    Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install.
    Executing: /lib/systemd/systemd-sysv-install enable ssh
    Created symlink /etc/systemd/system/sshd.service → /lib/systemd/system/ssh.service.
    Created symlink /etc/systemd/system/multi-user.target.wants/ssh.service → /lib/systemd/system/ssh.service.
  4. Configure SSH service to not automatically start during system boot.
    $ sudo systemctl disable ssh
    Synchronizing state of ssh.service with SysV service script with /lib/systemd/systemd-sysv-install.
    Executing: /lib/systemd/systemd-sysv-install disable ssh
    Removed /etc/systemd/system/multi-user.target.wants/ssh.service.
    Removed /etc/systemd/system/sshd.service.
  5. Restart SSH service using System V. Init scripts.
    $ sudo /etc/init.d/ssh restart
    Restarting ssh (via systemctl): ssh.service.
  6. View SSH status using systemd.
    $ sudo systemctl status ssh
    ● ssh.service - OpenBSD Secure Shell server
         Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: >
         Active: active (running) since Sun 2020-07-12 08:33:28 +08; 1s ago
           Docs: man:sshd(8)
                 man:sshd_config(5)
        Process: 3608 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCES>
       Main PID: 3629 (sshd)
          Tasks: 1 (limit: 4624)
         Memory: 1.3M
         CGroup: /system.slice/ssh.service
                 └─3629 sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups
    
    Jul 12 08:33:27 host systemd[1]: Starting OpenBSD Secure Shell server...
    Jul 12 08:33:28 host sshd[3629]: Server listening on 0.0.0.0 port 22.
    Jul 12 08:33:28 host sshd[3629]: Server listening on :: port 22.
    Jul 12 08:33:28 host systemd[1]: Started OpenBSD Secure Shell server.
Discuss the article:

Comment anonymously. Login not required.

Share!