November 30, 2021

Install cacti on centos7 or 8 server


Install cacti in centos server Hi to all, most of admins know Cacti is an open-source, web-based network monitoring and graphing tool
designed as a front-end application for the open-source,
industry-standard data logging tool RRDtool.

In this Article you will be learning how to install Cacti and installed it on CentOS  system.


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  installation are:

  • rrdtool
  • apache
  • mysql
  • cron
  • gcc

Let’s use yum to get these installed.

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
 

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:

chkconfig httpd on
chkconfig mysqld on
chkconfig crond on
 

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:



/etc/init.d/httpd start
/etc/init.d/mysqld start
/etc/init.d/crond start

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-0.8.8a.tar.gz
tar -xzvf cacti-0.8.8a.tar.gz
 

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

ln s cacti-0.8.8a 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:

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

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. Rimawi@321

/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 'Rimawi@321';
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/
nano 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 = "Rimawi@321";
$database_port = "3306";
$database_ssl = false;
 

Step 5 – Running the Web-based installer

Final Step go to the address of the web like: http://192.168.1.5/cacti

move to  next next next then enter:

User: admin

Password :admin 

If you have any problem to run this please make the following:

cd /etc/httpd/conf.d
nano cacti.conf

then copy to it the following:

Alias /cacti /var/www/html/cacti/
<Directory /var/www/html/cacti/>
Options Indexes FollowSymLinks Includes MultiViews
    Order allow,deny
    Allow from all
</Directory>

save it and restart the apache.

If you need any help don’t hesitate to contact me.



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