How to Properly Shutdown and Reboot Linux CentOS 5/CentOS 6/RHEL 5/RHEL 6

This post will show you the proper command to shutdown and reboot the linux server. To shut down Red Hat Enterprise Linux(RHEL) and CentOS, the root user may issue the /sbin/shutdown command. All the command has been tested on CentOS 6.2 but may workings on other CentOS and RHEL version. The shutdown man page has a complete list of options, but the two most common uses are:

Example 1. How to Properly Shutdown CentOS 5/CentOS 6/RHEL 5/RHEL 6 :

[root@centos62 ~]# /sbin/shutdown -h now

Example 2. How to Properly Reboot CentOS 5/CentOS 6/RHEL 5/RHEL 6 :

[root@centos62 ~]# /sbin/shutdown -r now

After shutting everything down, the -h option halts the machine, and the -r option reboots.

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These are another useful shutdown command :

Example 3. To shutdown in next 10 minutes:

[root@centos62 ~]# /sbin/shutdown -h +10

Example 4. To reboot in next 10 minutes:

[root@centos62 ~]# /sbin/shutdown -r +10

Example 5. To shutdown the server in next 3 seconds :

[root@centos62 ~]# /sbin/shutdown -t3 -r now

The option “-t3” tells the shutdown command to wait 3 seconds before it starts killing processes.

Example 6. Resheduled to shutdown the server at 12:15 :

login as: root
root@192.168.1.44's password:
Last login: Fri Jun  1 12:05:27 2012 from 192.168.1.52
[root@centos62 ~]# date
Fri Jun  1 12:12:00 MYT 2012
[root@centos62 ~]# /sbin/shutdown -r 12:15

Broadcast message from root@centos62.ehowstuff.local
        (/dev/pts/0) at 12:12 ...

The system is going down for reboot in 3 minutes!

Broadcast message from root@centos62.ehowstuff.local
        (/dev/pts/0) at 12:13 ...

The system is going down for reboot in 2 minutes!

Broadcast message from root@centos62.ehowstuff.local
        (/dev/pts/0) at 12:14 ...

The system is going down for reboot in 1 minute!

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