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Install Cacti Network Monitoring on RHEL/CentOS

Install Cacti Network Monitoring on RHEL/CentOS.

Cacti tool is an open source web based network monitoring and system monitoring graphing solution for IT business. Cacti enables a user to poll services at regular intervals to create graphs on resulting data using RRDtool. Generally, it is used to graph time-series data of metrics such as network bandwidth utilization, CPU load, running processes, disk space etc.

Install Cacti in RHEL/CentOS
In this how-to we are going to show you how to install and setup/configure complete network monitoring application called Cacti using Net-SNMP tool on RHEL systems using YUM package manager tool.
Cacti Required Packages
The Cacti required following packages to be installed on your Linux operating systems like RHEL/CentOS .
1. MySQL : A Database server to store cacti information.
2. Apache : A Web server to display network graphs created by PHP and RRDTool.
3. PHP : A script module to create graphs using RRDTool.
4. PHP-SNMP : A PHP extension for SNMP to access data.
5. RRDTool : A database tool to manage and retrieve time series data like CPU load, Network Bandwidth etc.
6. NET-SNMP : A SNMP (Simple Network Management Protocol) is used to manage network.

Installing Cacti Required Packages on RHEL/CentOS
First, we need to install following dependency packages one-by-one using YUM package manager tool.
Install Apache

# yum install httpd httpd-devel

Install MySQL

# yum install mysql mysql-server

Install PHP

# yum install php-mysql php-pear php-common php-gd php-devel php php-mbstring php-cli php-mysql

Install PHP-SNMP

# yum install php-snmp

Install NET-SNMP

# yum install net-snmp-utils p net-snmp-libs php-pear-Net-SMTP

Install RRDTool

# yum install rrdtool

Staring Apache, MySQL and SNMP Services
Once you’ve installed all the required software’s for Cacti installation, lets start them one-by-one using following commands.
Starting Apache, Mysql, SNNP services.

# service httpd start
# service mysqld start
# service snmpd start

Configuring Apache, MySQL and SNMP Services to start on boot.

# /sbin/chkconfig –levels 345 httpd on
# /sbin/chkconfig –levels 345 mysqld on
# /sbin/chkconfig –levels 345 snmpd on

Install Cacti on RHEL / CentOS / Fedora
Here, you need to install and enable EPEL Repository. Once you’ve enabled repository, type the following command to install Cacti application.

# yum install cacti

Sample Output:

Loaded plugins: fastestmirror, refresh-packagekit
Resolving Dependencies
–> Running transaction check
—> Package cacti.noarch 0:0.8.8a-2.el6 will be installed
–> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
cacti noarch 0.8.8a-2.el6 epel 2.0 M

Transaction Summary
================================================================================
Install 1 Package(s)

Total download size: 2.0 M
Installed size: 5.4 M
Is this ok [y/N]: y
Downloading Packages:
cacti-0.8.8a-2.el6.noarch.rpm | 2.0 MB 00:40
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : cacti-0.8.8a-2.el6.noarch 1/1
Verifying : cacti-0.8.8a-2.el6.noarch 1/1

Installed:
cacti.noarch 0:0.8.8a-2.el6

Complete!

Configuring MySQL Server for Cacti Installation
We need to configure MySQL for Cacti, to do this we need to set password for our newly installed MySQL server and then we will create Cacti database with user Cacti. If you’re MySQL is already password protected, then don’t need to set it again.
Set MySQL Password
To set new password for MySQL server, use the following command. (Note : This is for new MySQL installation only).

# mysqladmin -u root password YOUR-PASSWORD-HERE

Create MySQL Cacti Database
Login into MySQL server with newly created password and create Cacti database with user Cacti and set the password for it.

#mysqladmin -u -p create cacti;
# mysql -u root -p
mysql> create database cacti;
mysql> GRANT ALL ON cacti.* TO cacti@localhost IDENTIFIED BY ‘your-password-here’;
mysql> FLUSH privileges;
mysql> quit;

Install Cacti Tables to MySQL
Find out the database file path using RPM command, to install cacti tables into newly created Cacti database, use the following command.

# rpm -ql cacti | grep cacti.sql

Sample Output:

/usr/share/doc/cacti-0.8.7d/cacti.sql

Now we’ve of the location of Cacti.sql file, type the following command to install tables, here you need to type the Cacti user password.

#mysql -u cacti -p cacti < /usr/share/doc/cacti-0.8.8a/cacti.sql

Configure MySQL settings for Cacti
Open the file called /etc/cacti/db.php with any editor.

# vi /etc/cacti/db.php

Make the following changes and save the file. Make sure you set password correctly.
/* make sure these values reflect your actual database/host/user/password */

$database_type = “mysql”;
$database_default = “cacti”;
$database_hostname = “localhost”;
$database_username = “cacti”;
$database_password = “your-password-here”;
$database_port = “3306”;
$database_ssl = false;

Configuring Apache Server for Cacti Installation
Open file called /etc/httpd/conf.d/cacti.conf with your choice of editor.

# vi /etc/httpd/conf.d/cacti.conf

You need to enabled access to Cacti application for your local network or per IP level. For example we’ve enabled access to our local LAN network 172.16.16.0/20. In your case, it would be different.

Alias /cacti /usr/share/cacti


Order Deny,Allow
Deny from all
Allow from 192.16.16.0/20

Finally, restart the Apache service.

# service httpd restart

Setting Cron for Cacti
Open file /etc/cron.d/cacti.

# vi /etc/cron.d/cacti

Uncomment the following line. The poller.php script runs every 10mins and collects data of known host which is used by Cacti application to display graphs.

#*/10 * * * * cacti /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

Running Cacti Installer Setup
Finally, Cacti is ready, just go to http://YOUR-IP-HERE/cacti/ & follow the installer instruction through the following screens. Click Next button.

Cacti Setup Screen
Please choose installation Type as “New Install“.

Select Cacti New Install
Make sure all the following values are correct before continuing. Click Finish button.

Cacti Installation Directories
Cacti Login Screen, enter username as admin and password as admin.

Cacti Login Screen
Once you’ve entered username and password, it will ask you to enter a new password for cacti.

Cacti Force Password Screen
Cacti Console Screen.

Cacti Console Screen
How to Create New Graphs
To create graphs, Click on New Graphs –> Select Host –> Select SNMP – Interface Statistics and Select a graph type In/Out Bits. Click on Create button. Please refer screen below.

How to Create Graphs in Cacti
For more information and usage please visit the Cacti Page.

About

I am founder and webmaster of www.linuxpcfix.com and working as a Sr. Linux Administrator (Expertise on Linux/Unix & Cloud Server) and have been in the industry from last 7 years.

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