Install and Configure Cacti Network Graphing Tool on RedHat / CentOS

Cacti is a network graphing tool similar to MRTG. How do I install and configure common options to collect SNMP data and various other data (such as system load, network link status, hard disk space, logged in users etc) into an RRD?

From the official project site:

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.

Required software:

You need to install the following software on RHEL / Fedora / CentOS Linux:

MySQL Server : Store cacti data.
NET-SNMP server – SNMP (Simple Network Management Protocol) is a protocol used for network management.
PHP with net-snmp module – Access SNMP data using PHP.
Apache / lighttpd / ngnix webserver : Web server to display graphs created with PHP and RRDTOOL.

Install the software

First, login as root user and type the following command to install mysql, apache and php:
# 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

You may need to add some repositories to install all packages.

Configure MySQL server

First, set root password:

# mysql -u root -p -e 'create database cacti'
Create a user called cacti with a password called zYn95ph43zYtq, enter:
# mysql -u root -p

mysql> GRANT ALL ON cacti.* TO cacti@localhost IDENTIFIED BY 'zYn95ph43zYtq';

mysql> FLUSH privileges;

mysql> \q

Install snmpd

Type the following command to install net-snmpd
# yum install net-snmp-utils php-snmp net-snmp-libs
Configure snmpd, open /etc/snmp/snmpd.conf
# vi /etc/snmp/snmpd.conf
Append / modify it as follows (see snmpd.conf man page for details):

com2sec local     localhost           public

group MyRWGroup v1         local

group MyRWGroup v2c        local

group MyRWGroup usm        local

view all    included  .1                               80

access MyRWGroup ""      any       noauth    exact  all    all    none

syslocation Unknown (edit /etc/snmp/snmpd.conf)

syscontact Root  (configure /etc/snmp/snmp.local.conf)

pass .1.3.6.1.4.1.4413.4.1 /usr/bin/ucd5820stat

Save and close the file. Turn on snmpd service:
# /etc/init.d/snmpd start
# chkconfig snmpd on
Make sure you are getting information from snmpd:
# snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex
Sample ouptut:

IP-MIB::ipAdEntIfIndex.10.10.29.68 = INTEGER: 2

IP-MIB::ipAdEntIfIndex.67.yy.zz.eee = INTEGER: 3

IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1

Install cacti

First, make sure EPEL repo is enabled. Type the following command to install cacti:
# yum install cacti

Install cacti tables

Type the following command to find out cacti.sql path:
# rpm -ql cacti | grep cacti.sql
Sample output:

/usr/share/doc/cacti-0.8.7d/cacti.sql  (insteed : /var/www/cacti/cacti.sql)

Type the following command to install cacti tables (you need to type the cacti user password):
# mysql -u cacti -p cacti < /usr/share/doc/cacti-0.8.7d/cacti.sql

Configure cacti

Open /etc/cacti/db.php file, enter:
# vi /etc/cacti/db.php (insteed : vi /var/www/cacti/include/config.php)
Make changes as follows:

/* make sure these values refect your actual database/host/user/password */

$database_type = "mysql";

$database_default = "cacti";

$database_hostname = "localhost";

$database_username = "cacti";

$database_password = "zYn95ph43zYtq";

$database_port = "3306";

Save and close the file.

Configure httpd

Open /etc/httpd/conf.d/cacti.conf file, enter:
# vi /etc/httpd/conf.d/cacti.conf
You need to update allow from line. Either set to ALL or your LAN subnet to allow access to cacti:

# Cacti: An rrd based graphing tool

Alias /cacti    /usr/share/cacti

<Directory /usr/share/cacti/>

        Order Deny,Allow

        Deny from all

        Allow from 10.0.0.0/8

</Directory>

Another option is create /usr/share/cacti/.htaccess file and password protect the directory. Finally, restart httpd:
# service httpd restart

Setup cacti cronjob

Open /etc/cron.d/cacti file, enter:
# vi /etc/cron.d/cacti
Uncomment the line:

*/5 * * * *     cacti   /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1

Save and close the file.

Run cacti installer

Now cacti is ready to install. Fire a webbrowser and type the url:
http://your.example.com/cacti/
OR
http://your.server.ip.address/cacti/
Just follow on screen instructions. The default username and password for cacti is admin / admin. Upon first login, you will be force to change the default password.