By default, the yum repository configuration on Centos does not have rrdtool in it.

To Solve this problem, we need to add more repository that have rrdtool on it.

Login into your server via SSH with root access
[code]$cd /etc/yum.repos.d/[/code]

Create a file and name it dag.repo
[code]$vi dag.repo

What is LiteSpeed Load Balancer

LiteSpeed Load Balancer (LSLB) is a high-performance, content-aware, session-aware HTTP application load balancer. It can forward requests based on request content as well as session stickiness preference. LiteSpeed Load Balancer can help scale your application beyond one server deployment, as well as improve the reliability of your service in case of hardware failures.

Example: we will build 1 load balancer with 2 webserver behind load balancer.

Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.
Before installing cacti, we must install http, php, mysql, rrdtool, and net-snmp.

Installation

1. Install http, php, and mysql
   yum -y install httpd php mysql mysql-server php-mysql
2. Restart service httpd
   service httpd restart
3. Run service mysqld
   service mysqld start
4. Install rrdtool
   yum install rrdtool
5. Install net-snmp
   yum install net-snmp*
6. Install cacti
   yum install cacti
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