How To Install Cacti on CentOS 7 / RHEL 7 – A Network Monitoring Tool

2

ADVERTISEMENT

Cacti is an open-source web-based network monitoring tool designed as the front end application for the RRDtool (Round-Robin Database tool), it allows a user to poll the services at an interval of time and resulting in the graph format.

Cacti is used to get a graph data for the CPU and network bandwidth utilization, it monitors the network traffic by polling a router or switch via SNMP.

Here, we will see how to install Cacti on CentOS 7 / RHEL 7.

THIS DOCUMENT IS ALSO AVAILABLE FOR

Prerequisites

Setup EPEL Repository

Setup EPEL repository only CentOS 7 / RHEL 7.

rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

Install SNMP

Install SNMP and RRDTool.

yum -y install net-snmp net-snmp-utils net-snmp-libs rrdtool

Install PHP & PHP Extensions

The PHP version available in base OS repository is already reached the end of life and for the Cacti installation, you may need to go for PHP v7.2+.

So, we will use the Remi repository to install PHP 7.x.

READ: How To Install PHP 7.3/7.2 On CentOS 7 / RHEL 7

yum install -y https://rpms.remirepo.net/enterprise/remi-release-7.rpm

PHP v7.3

yum install -y --enablerepo=remi-php73 php php-xml php-session php-sockets php-ldap php-gd php-gmp php-intl php-mbstring php-mysqlnd php-pdo php-process php-snmp

PHP v7.2

yum install -y --enablerepo=remi-php723 php php-xml php-session php-sockets php-ldap php-gd php-gmp php-intl php-mbstring php-mysqlnd php-pdo php-process php-snmp

Install MariaDB

The MariaDB package (v5.4) available in the base OS repository doesn’t meet Cacti’s minimum requirement as Cacti requires MariaDB v5.6+ or MariaDB v10+ for installation. So, install the latest version of MariaDB available from the official MariaDB community website.

READ: How To Install MariaDB on CentOS 7 / RHEL 7

You can also install MySQL 8 on CentOS 7 / RHEL 7 as a database for Cacti installation
### CentOS 7 ###

cat <<EOF>> /etc/yum.repos.d/mariadb.repo
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.4/centos7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
EOF


### RHEL 7 ###

cat <<EOF>> /etc/yum.repos.d/mariadb.repo
[mariadb]
name = MariaDB
baseurl = http://yum.mariadb.org/10.4/rhel7-amd64
gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB
gpgcheck=1
EOF

Install the MariaDB server using the following command.

yum install -y MariaDB-server MariaDB-client

Database Tuning

Cacti recommend changing MariaDB settings for better performances. Edit the MariaDB configuration file.

vi /etc/my.cnf.d/server.cnf

Add variables in the [mysqld] section.

collation-server = utf8mb4_unicode_ci
character-set-server=utf8mb4
max_heap_table_size = 64M
tmp_table_size = 64M
join_buffer_size = 64M
innodb_file_format = Barracuda
innodb_large_prefix = 1
innodb_flush_log_at_timeout = 3
innodb_buffer_pool_size = 1GB
innodb_buffer_pool_instances = 10
# Based on what type for storage you use. The below values are for SSD drives.
# Change it if Cacti reports issues during the installation
innodb_read_io_threads = 32
innodb_write_io_threads = 16
innodb_io_capacity = 5000
innodb_io_capacity_max = 10000

Start & Enable Services

Start the following services.

systemctl start httpd snmpd mariadb

Enable the services to start automatically on system boot.

ADVERTISEMENT

systemctl enable httpd snmpd mariadb

Create Database

If you are configuring the MySQL for the first time; take a look at how to secure the MariaDB.

Create a database for Cacti installation.

mysql -u root -p

Create a database for Cacti.

create database cacti;

Grant permission to the newly created database.

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

The newly created database user (cactiuser) should have access to the mysql.time_zone_name table. To do that, import the mysql_test_data_timezone.sql to mysql database first.

mysql -u root -p mysql < /usr/share/mysql/mysql_test_data_timezone.sql

Then, log in to MySQL.

mysql -u root -p

Grant the permission to cactiuser.

GRANT SELECT ON mysql.time_zone_name TO cactiuser@localhost;
flush privileges;
exit

Install Cacti

Use the yum command on CentOS / RHEL to install Cacti package.

yum -y install cacti

Import the default database to the cacti database.

mysql cacti < /usr/share/doc/cacti-*/cacti.sql -u root -p

Edit the config file to specify the database type, name, hostname, user, and password information.

vi /usr/share/cacti/include/config.php

Make the changes accordingly.

/* make sure these values reflect your actual database/host/user/password */
$database_type = "mysql";
$database_default = "cacti";
$database_hostname = "localhost";
$database_username = "cactiuser";
$database_password = "cactipassword";
$database_port = "3306";
$database_ssl = false;

Edit the crontab file.

vi /etc/cron.d/cacti

Uncomment the following entry to poll every five min.

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

Set the timezone by editing /etc/php.ini file.

vi /etc/php.ini

Update the timezone.

ADVERTISEMENT

date.timezone = US/Central
memory_limit = 512M
max_execution_time = 60

Edit the Apache configuration file to perform the remote installation.

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

Modify the first directory stanza, from Require host localhost.

Alias /cacti /usr/share/cacti
<Directory /usr/share/cacti/>
            <IfModule mod_authz_core.c>
                         # httpd 2.4
                         Require host localhost
            </IfModule>
            <IfModule !mod_authz_core.c>
                         # httpd 2.2
                         Order deny,allow
                         Deny from all
                         Allow from localhost
            </IfModule>
</Directory>

To Require all granted.

Alias /cacti /usr/share/cacti
<Directory /usr/share/cacti/>
            <IfModule mod_authz_core.c>
                         # httpd 2.4
                         Require all granted
            </IfModule>
            <IfModule !mod_authz_core.c>
                         # httpd 2.2
                         Order deny,allow
                         Deny from all
                         Allow from localhost
            </IfModule>
</Directory>

Restart the services.

systemctl restart httpd

Firewall

Configure the firewall to allow HTTP service.

firewall-cmd --permanent --add-service=http

firewall-cmd --reload

SELinux

Set the SELinux context for Cacti logs.

yum install -y policycoreutils-python

semanage fcontext -a -t httpd_sys_rw_content_t "/var/log/cacti(/.*)?"

restorecon -Rv /var/log/cacti/
If you are still unable to make Cacti work correctly, consider to permanently disable SELinux. To temporarily disable the SELinux, run the following command in the terminal.
setenforce 0

Setup Cacti

Visit the following URL to start the installation of cacti.

http://your-ip-address/cacti

Login to Cacti to set up Cacti installation.

Username: admin
Password: admin

Login To Setup Cacti
Login To Setup Cacti

You must change the password of the Cacti admin user before you setup Cacti.

Change Cacti Admin Password
Change Cacti Admin Password

Accept the License Agreement on this page and then click on Next to continue.

Accept Cacti License Agreement
Accept Cacti License Agreement

Cacti perform pre-installation checks for Cacti installation. You need to fix the problems if the installation wizard reports.

Move to the next step by clicking the Next button located at the right bottom of the page.

Cacti Preinstallation Checks
Cacti Preinstallation Checks

Select New Primary Server or the new installation and then click Next.

Cacti Installation Type
Cacti Installation Type

This step checks and reports for permission problems you may have in the Cacti installation directory.

ADVERTISEMENT

Cacti Directory Permission Checks
Cacti Directory Permission Checks

It will show you if there is any package is missing, which is mandatory for the cacti.

Cacti Binary Location
Cacti Binary Location

Click Next on the default profile page as we already configured cron to poll every five minutes.

Cacti Profile
Cacti Profile

Select all templates and click Finish to complete the Cacti installation.

Cacti Template Setup
Cacti Template Setup

Click Next on the final test summary page.

Summary
Summary

Select Confirm Installation and press Install to begin the Cacti installation.

Confirm Cacti Installation
Confirm Cacti Installation

Wait for the installation to complete.

Cacti Installation In Progress
Cacti Installation In Progress

In a minute or two, the Cacti installation will complete.

Installation Complete
Installation Complete

Clicking on the Get Started on the above page will take you directly to the Cacti dashboard. Otherwise, you can log in to Cacti with the user name and the password you set during the Cacti installation.

Access Cacti

Enter the User Name and Password to login to Cacti.

Username: admin
Password: <YOUR_PASSWORD>
Login To Cacti
Login To Cacti

Cacti Dashboard:

Cacti Dashboard
Cacti Dashboard

By default, the local machine (your Cacti server) will be added for monitoring in Cacti. You can Go to Graphs >> Default Tree >> Local Linux Machine to see the usage graph of the Cacti server.

Local Machine Usage Graph
Local Machine Usage Graph

Conclusion

That’s All. I hope you have learned how to install Cacti on CenOS 7 / RHEL 7. Now, you can check out how to monitor remote Linux machines with Cacti monitoring tool. Please share your feedback in the comments section.

You might also like