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There’s a new eBook coming up with detailed description of the Cacti installation process on CentOS, Ubuntu, Debian and Windows systems !

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In this posting you will be learning how to install Cacti 1.x on a freshly installed CentOS 7 system.

Addition Information

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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
  • mariadb
  • cron
  • gcc

Before we install these, let’s add the mariadb repository to our CentOS 7 system:

echo "# MariaDB 10.1 CentOS repository list - created 2017-02-08 16:11 UTC
name = MariaDB
baseurl =
gpgcheck=1" > /etc/yum.repos.d/MariaDB.repo

Now we can finally use yum to get all required packages installed.

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 wget help2man \
 php-posix php-ldap php-mbstring php-gd

gcc and the devel packages are required for the installation of spine, hence that’s why we include it here.

In order to have all packages up-to-date, let’s do a quick upgrade on our system as well:

yum -y upgrade

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 7:
systemctl enable httpd.service
systemctl enable mariadb.service

Next, we need to change some settings for the mariadb server. These will make sure that spine and Cacti are utilizing the database connection in an optimal way.

Edit the /etc/my.cnf.d/server.cnf file and add the following lines to the [mysqld] section:


Make sure to adapt the default-time-zone to your requirements

Next, we need to restart the web-server as well as the Maria DB service in order to continue the installation:

CentOS 7:
systemctl restart httpd.service
systemctl restart mariadb.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
tar -xzvf cacti-latest.tar.gz

I usually suggest to create a symbolic link to the newly created directory “cacti-1.1.13”. This will make upgrades to never Cacti versions easier:

ln -s cacti-1.1.13 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 1 minute polling interval using the following command:

echo "*/1 * * * * 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 resource scripts cache
chmod -R 775 rra log resource scripts cache


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


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

# Create the timezone data and import it into the mysqldatabase
mysql_tzinfo_to_sql /usr/share/zoneinfo > /tmp/mysql_timezone.sql
mysql -p mysql < /tmp/mysql_timezone.sql
# Create the Cacti database and populate it with the default data
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 seeing 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 SELECT ON mysql.time_zone_name TO cactiuser@localhost IDENTIFIED BY 'MyV3ryStr0ngPassword';
GRANT ALL ON cacti.* TO cactiuser@localhost IDENTIFIED BY 'MyV3ryStr0ngPassword';
flush privileges;

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

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
date.timezone = Europe/Berlin


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

Step 7 – Disable SELinux

SELinux does interfere with the installation, so let’s disable it for now:

setenfore 0

Step 8 – Running the Web-based installer

Let’s move on to the web-based installer.


Login with admin/admin and you’re ready to go !

Please go to “Console -> System Utilities” and click on “Rebuild Poller Cache” after the first login!

Need Commercial Support ? offer commercial Cacti support not only for Cacti itself, but also for several of the plugins ( e.g. Thold ).
There’s going to be an on-demand solution in the future. You can contact us for more details using the contact form.

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