Essential Guide to Managing RHEL System Services / Daemons

In RHEL, you can manage system services daemons using the systemctl command. This command allows you to start, stop, restart, enable, or disable system service daemons as needed.

To start a system service daemon, use the systemctl start command followed by the name of the service. For example:

$ systemctl start ssh

To stop a system service daemon, use the systemctl stop command followed by the name of the service. For example:

$ systemctl stop ssh

To restart a system service daemon, use the systemctl restart command followed by the name of the service. For example:

$ systemctl restart ssh

To enable a system service daemon to start at boot time, use the systemctl enable command followed by the name of the service. For example:

$ systemctl enable ssh

To disable a system service daemon from starting at boot time, use the systemctl disable command followed by the name of the service. For example:

$ systemctl disable ssh

You can also use the systemctl status command to view the current status of a system service daemon, including whether it is running, stopped, or enabled. For example:

$ systemctl status ssh
● ssh.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2020-06-01 09:08:15 EDT; 1h 20min ago
     Docs: man:sshd(8)
           man:sshd_config(5)
 Main PID: 358 (sshd)
    Tasks: 1 (limit: 507)
   Memory: 2.4M
   CGroup: /system.slice/ssh.service
           └─358 /usr/sbin/sshd -D

Jun 01 09:08:15 localhost.localdomain systemd[1]: Started OpenSSH server daemon.