1. service command – Stop, start, restart or find the status of system services.
2. chkconfig command – Turn on or off services on boot time.

sshd service name a CentOS Linux

The name of the service is also sshd and usually controlled by /etc/init.d/sshd script or service command.

CentOS turn on OpenSSH SSHD server on boot time command

The syntax is as follows to turn on SSHD on boot time:

# chkconfig sshd on

To turn off service on boot time, enter:

# chkconfig sshd off

To see the current status of service in each run-level type:

# chkconfig --list sshd

Sample outputs:

sshd           	0:off	1:off	2:on	3:on	4:on	5:on	6:off

CentOS start sshd service command

The syntax is:

# service sshd start

OR

# /etc/init.d/sshd start

CentOS stop sshd service command

The syntax is:

Alert: Do not run the following command over ssh based session and you will end up getting ‘network connectivity lost’ error.

# service sshd stop

OR

# /etc/init.d/sshd stop

CentOS restart sshd service command

The syntax is:

# service sshd restart

OR

# /etc/init.d/sshd restart

CentOS find status of the sshd service command

The syntax is:

# service sshd status

OR

# /etc/init.d/sshd status

Sample session outputs from the above commands