Install Cacti on CentOS 6/7 ~ Cambodia Kingdom Of Wonder

Step 1 – Prerequisites

First we need to install some of the software packages needed for Cacti to run properly. Software which is not included or enabled in the base CentOS 6 installation are:

rrdtool
apache
mysql
cron
gcc

Let’s use yum to get these installed.

Centos 6:
#yum -y install mysql-server php php-cli php-mysql net-snmp-utils rrdtool \
  php-snmp gcc mysql-devel net-snmp-devel autoconf automake libtool dos2unix

Centos 7:
#yum -y install mariadb-server php php-cli php-mysql net-snmp-utils rrdtool \
  php-snmp gcc mariadb-devel net-snmp-devel autoconf automake libtool dos2unix

gcc and the devel packages are required for the installation of spine, hence that’s why we include it here.
Now let’s make sure that our webserver and the database are automatically starting up after a reboot. Use the following commands to enable these:

CentOS 6:
#chkconfig httpd on
#chkconfig mysqld on
#chkconfig crond on

CentOS 7:
#systemctl enable httpd.service
#systemctl enable mariadb.service
#systemctl enable crond.service

Now that we did make sure that these services start after a reboot, 
let’s start them manually now in order to continue the installation. 
Cron may already be running so don’t panic if you don’t see the usual 
start message:

CentOS 6:
#service httpd restart
#service mariadb restart
#service crond restart

CentOS 7:
#systemctl restart httpd.service
#systemctl restart mariadb.service
#systemctl restart crond.service

Step 2 – Cacti Files

 Let’s now move to the actualy installation of Cacti. First we need to 
download and extract it. As of version 0.8.8, a fully patched Cacti 
including the Plugin Architecture (PIA) is officially available, so 
we’re downloading that one:

#cd /var/www/html
#wget http://www.cacti.net/downloads/cacti-0.8.8f.tar.gz
#tar -xzvf cacti-0.8.8f.tar.gz

I usually suggest to create a symbolic link to the newly created 
directory “cacti-0.8.8b”. This will make upgrades to never Cacti 
versions easier:

#ln -s cacti-0.8.8f cacti

Step 3 – Cron and file permissions

Cacti uses cron (scheduled task) in order to execute its polling 
process.  It’s always a good idea to run this under a special user. 
Let’s create the system “cacti” user now:

#adduser -d /var/www/html/cacti -s /sbin/nologin cacti

 Having done that, we can now  add a new cron entry to your system for a 5 minute

polling interval using the following command:

#echo "*/5 * * * * cacti php /var/www/html/cacti/poller.php &>/dev/null" \

>> /etc/cron.d/cacti

To check cron log:
#tailf /var/log/cron
Finally, we also need to make sure that the permissions on the log and rra

directories are set correctly:

#cd /var/www/html/cacti
#chown -R cacti.apache rra log  
#chmod 775 rra log

Step 4 – Cacti Database

Now that we have extracted the cacti files, we can move on preparing the database for the final installation step. Your first step should be securing the mysql database. The following command will help you with this task on a CentOS system. Make sure to select a strong password for root, e.g. MyN3wpassw0rd

#/usr/bin/mysql_secure_installation

Let’s create a new database and assign a special user to it:

#mysqladmin -u root -p create cacti
#mysql -p cacti < /var/www/html/cacti/cacti.sql
#mysql -u root -p

With the last command, you should be seing a mysql prompt where you can 
enter mysql commands. Here we are going to create the special cacti 
user. That user only needs to be able to connect from the local system 
and should have a strong password as well. Enter the following commands 
and make sure to replace the password:

GRANT ALL ON cacti.* TO cactiuser@localhost IDENTIFIED BY 'MyV3ryStr0ngPassword';
flush privileges;
exit

We now have the cacti files and the cacti database setup. The last step 
before moving to the web-based installer is setting the database 
credentials within the Cacti config file:

#cd /var/www/html/cacti/include/
#vi config.php

Change the $database_ lines to fit your new settings:

$database_type = "mysql";
$database_default = "cacti";
$database_hostname = "localhost";
$database_username = "cactiuser";
$database_password = "MyV3ryStr0ngPassword";
$database_port = "3306";
$database_ssl = false;

Depending on your installation, you should also uncomment the following 
line. In our example we have to make sure the following line is there:

$url_path = "/cacti/";

Step 5 – Adding firewall rules

The following settings will add access rules to http and https from outside:

Centos 7:
firewall-cmd --permanent --zone=public --add-service=https
firewall-cmd --permanent --zone=public --add-service=http
firewall-cmd --reload

How to setup iptables in centos 7

Step 6 – Important PHP Settings

The default PHP installation usually has not configured the correct timezone or php error reporting. While not required to run Cacti, it’s highly recommended to enable error reporting to syslog for troubleshooting issues with plugins or other scripts.
The following lines need to be enabled/configued in your /etc/php.ini file:

; Defines the default timezone used by the date functions
; http://php.net/date.timezone
date.timezone = Europe/Berlin

and

; Log errors to syslog (Event Log on NT, not valid in Windows 95).
error_log = syslog

Step 7 – Running the Web-based installer

Let’s move on to the web-based installer.
open web browser : server-ip/cacti
and follow install until finish.default user admin password admin.
Install Cacti Realtime plugin
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=======================
http://blog.network-outsourcing.de/cacti-howtos/cacti/installing-cacti/

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Install Cacti on CentOS 6/7