systemctl
command is used on RedHat 7 linux to manage services system wide. It allows administrators to manage ssh service to start, restart, stop or enable autoload after system startup.
In install ssh service on your RHEL 7 linux run a following linux command:
# yum install openssh
By defalt SSH service or to be more precise sshd
( daemon ) is disabled. Once the opensshd package installed, you can check the status of SSHD service by using the below command:
# systemctl status sshd sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled) Active: inactive (dead)
To start ssh daemon (sshd) on RHEL 7 run:
systemctl start sshd
After you have successfully started SSHD daemon check the sshd service status by:
# systemctl status sshd sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled) Active: active (running) since Mon 2014-09-01 09:35:17 EST; 2s ago Process: 6191 ExecStartPre=/usr/sbin/sshd-keygen (code=exited, status=0/SUCCESS) Main PID: 6194 (sshd) CGroup: /system.slice/sshd.service └─6194 /usr/sbin/sshd -D Sep 01 09:35:17 localhost.localdomain systemd[1]: Started OpenSSH server daemon. Sep 01 09:35:17 localhost.localdomain sshd[6194]: Server listening on 0.0.0.0 port 22. Sep 01 09:35:17 localhost.localdomain sshd[6194]: Server listening on :: port 22.
Next, time you reboot your RHEL 7 Linux box you will need to manually start ssh service again. To start sshd
service automatically after reboot enter a following linux command into your terminal:
# systemctl enable sshd ln -s '/usr/lib/systemd/system/sshd.service' '/etc/systemd/system/multi-user.target.wants/sshd.service'
To disable sshd
on your RHEL 7 linux system amend the above command to:
# systemctl disable sshd rm '/etc/systemd/system/multi-user.target.wants/sshd.service'