update centos 5.7 to centos 5.9

Update centos 5.5, 5.6 , 5.7  or 5.8 to 5.9

STEP 1 :

BACKUP everything if something go wrong

Step 2:

Update with YUM update

first clean all, second update glibc, yum, rpm and python packages and then update other packages like following:

yum clean all
yum update glibc* yum* rpm* python*
yum update

Step 3:

Reboot

#reboot

Step 4:

check centos release info

cat /etc/redhat-release

## Output ##

CentOS release 5.9 (Final)