http://docs.fedoraproject.org/yum/en/

Update CentOS

on centos 4 & 5 you will now need to use rpm to import the rpm gpg key before up2date or yum will work

rpm import
# mount /dev/cdrom /media/cdrom
# cd /media/cdrom
# rpm --import RPM-GPG-KEY-centos4
OR
# rpm --import RPM-GPG-KEY-CentOS-5
# cd
# eject


Centos 4 update using up2date
# up2date -u


Centos 4 & 5 update using yum
# yum check-update

# yum update


See
Yum
YumEx

REFERRERS
CentOS
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