Cacti Variables- PHP SNMP Support: no, PHP SNMP Not Installed

Problem:
When i load my cacti "about.php" page, at the bottom, under Cacti Variables, i see:

PHP SNMP Support

no

And also clicking on the "System Utilities > Technical Support" Page, under PHP Information, i see:

PHP SNMP

Not Installed

The problem was i didn't have the php-snmp packages installed on my server!

# rpm -qa | grep php

php55w-5.5.15-1.w6.x86_64

php55w-cli-5.5.15-1.w6.x86_64

php55w-pdo-5.5.15-1.w6.x86_64

php55w-common-5.5.15-1.w6.x86_64

php55w-mysql-5.5.15-1.w6.x86_64

Solution:

1. Find the php-snmp package that matches your php version and install it:

# yum install http://repo.webtatic.com/yum/el6-testing/x86_64/php55w-snmp-5.5.15-1.w6.x86_64.rpm

Loaded plugins: product-id, replace, security, subscription-manager

Updating certificate-based repositories.

Setting up Install Process

php55w-snmp-5.5.15-1.w6.x86_64.rpm                                                                                                                                                                        |  30 kB     00:00     

Examining /var/tmp/yum-root-M9Lg4I/php55w-snmp-5.5.15-1.w6.x86_64.rpm: php55w-snmp-5.5.15-1.w6.x86_64

Marking /var/tmp/yum-root-M9Lg4I/php55w-snmp-5.5.15-1.w6.x86_64.rpm to be installed

Resolving Dependencies

--> Running transaction check

---> Package php55w-snmp.x86_64 0:5.5.15-1.w6 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================

 Package                                           Arch                                         Version                                              Repository                                                             Size

==========================================================================================================

Installing:

 php55w-snmp                                       x86_64                                       5.5.15-1.w6                                          /php55w-snmp-5.5.15-1.w6.x86_64                                       107 k

Transaction Summary

===========================================================================================================

Install       1 Package(s)

Total size: 107 k

Installed size: 107 k

Is this ok [y/N]: y

Downloading Packages:

Running rpm_check_debug

Running Transaction Test

Transaction Test Succeeded

Running Transaction

Installing : php55w-snmp-5.5.15-1.w6.x86_64                                                                                            

Installed products updated.

Installed:

php55w-snmp.x86_64 0:5.5.15-1.w6                                                                                                                                                                                               

Complete!

#
# rpm -qa | grep php
php55w-5.5.15-1.w6.x86_64
php55w-cli-5.5.15-1.w6.x86_64
php55w-pdo-5.5.15-1.w6.x86_64
php55w-snmp-5.5.15-1.w6.x86_64
php55w-common-5.5.15-1.w6.x86_64

php55w-mysql-5.5.15-1.w6.x86_64

2. Restart Appache:

# /etc/init.d/httpd start

                                                          [  OK  ]

3. Test Again, should look like below:

PHP SNMP Installed

PHP SNMP Support: yes