1.Set the sshd service to boot [root@centos ~]# chkconfig sshd on View sshd boot status [root@centos ~]# chkconfig --list|grep SSHD 2. sshd statusopenssh-daemon (pid 3378) is running.... .3. Stopping sshd service [root@centos ~]# service sshd stopStopping sshd: 4. Starting sshd service [ OK ][root@centos ~]# service sshd startStarting sshd: [ OK ]5. sshd service configuration file / etc/ssh/sshd_config