HOW TO RESTORE OFF A MOUNTED SLAVE DISK ON REDHAT + CPANEL (CRASH/HACK/BAD KERNEL)

How to Restore off a mounted slave disk on Redhat + Cpanel (crash/hack/bad kernel)

Warning: This is not to be done by the unexperienced admins bad things could happen. Hire someone.

Sometimes if you get hacked or boot with a bad kernel you need to have the datacenter mount your old drive, and install a new one with a fresh installation of redhat. First things first lets make sure you have an updated kernel, we will do it with up2date for ease of use:

up2date -f kernel

check the grub.conf /or lilo config to ensure the settings are right. (if using lilo run this command aswell /sbin/lilo -v -v and check for errors)

Now reboot the server

shutdown -r now
I. Mount the backup Drive

First check to see if there are any drives mounted.

df -h

You should get something simular to this if it isent mounted yet:

[root@localhost root]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda2 37G 1.4G 33G 4% /
/dev/hda1 101M 7.7M 88M 9% /boot
none 125M 0 125M 0% /dev/shm
[root@localhost root]#

if it is mounted you will see something like this:

-bash-2.05b# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda3 53G 31G 20G 62% /
/dev/hda1 99M 14M 80M 15% /boot
none 248M 0 248M 0% /dev/shm
/dev/hdc3 53G 31G 20G 61% /mnt/old
-bash-2.05b#

HOW TO INSTALL CACTI ON LINUX

Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices. For More information http://www.cacti.net/what_is_cacti.php

• first login as root to the server. please note this should have "yum" install already. my recommendation is to use standalone server or virtual server for monitoring . its depend on your network size.

# yum install mysql-server mysql php-mysql php-pear php-common php-gd php-devel php php-mbstring php-cli php-snmp php-pear-Net-SMTP php-mysql httpd

• Configure MySQL server

# mysqladmin -u root password NEWPASSWORD

• Create cacti MySQL database