6. Updating Your System with yum
Use the update option to upgrade all of your
CentOS system software to the latest version with one operation.
To perform a full system update, type this command:
su -c 'yum update'
At the prompt, enter the
root password.
6.1. Automatically Updating Your System
The yum package supplied with CentOS includes
scripts to perform full system updates every day. To activate
automatic daily updates, enter this command:
su -c '/sbin/chkconfig --level 345 yum on; /sbin/service yum start'
At the prompt, enter the password for the
root account.
![[Note]](HEADER.images/note.png) | How Daily Updates are Run |
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There is no separate yum service that runs
on your system. The command given above enables the control
script /etc/rc.d/init.d/yum. This control
script activates the script
/etc/cron.daily/yum.cron, which causes
the cron service to perform the system
update automatically at 4am each day.
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