Install Icinga2 v2.4.2 (Network Monitoring Tool) on RHEL, CentOS, Fedora & openSUSE

4) Install Icinga2 plugin

Icinga2 will collect the service information based on the monitoring plugins. So, we need to install nagios plugin using below command.

# For RHEL/CentOS/Fedora 21 and older system #
# yum install nagios-plugins-all

# For Fedora 21 and later systems #
# dnf install nagios-plugins-all

# For openSUSE systems #
# zypper install nagios-plugins

5) Install IDO modules for MySQL

We are going to Install IDO modules for MySQL which will use for Icinga2 Web interface and other web interfaces. The DB IDO (Database Icinga Data Output) modules for Icinga 2 take care of exporting all configuration and status information into a database.

# For RHEL/CentOS/Fedora 21 and older system #
# yum install icinga2-ido-mysql

# For Fedora 21 and later systems #
# dnf install icinga2-ido-mysql

# For openSUSE systems #
# zypper install icinga2-ido-mysql

6) Setting up the MySQL database

Setting up the MySQL database for Icinga2.

# Setting up the MySQL database Icinga2 #
# mysql -u root -p
MariaDB [(none)]> CREATE DATABASE icinga;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> GRANT SELECT, INSERT, UPDATE, DELETE, DROP, CREATE VIEW, INDEX, EXECUTE ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'icinga';
Query OK, 0 rows affected (0.01 sec)

MariaDB [(none)]> exit
Bye

# Importing the Icinga 2 IDO schema into database #
# mysql -u root -p icinga < /usr/share/icinga2-ido-mysql/schema/mysql.sql

# Enabling the IDO MySQL module #
# icinga2 feature enable ido-mysql
warning/cli: Feature 'ido-mysql' already enabled.
Make sure to restart Icinga 2 for these changes to take effect.

# For SysVinit systems #
# service restart icinga2

# For Systemd systems #
# systemctl restart icinga2.service

7) Setup Firewall Rules

If you installed iptables you have to allow the httpd and its port to work outside the world.

# All Distro #
# iptables -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
# service iptables save

# For RHEL/CentOS 7 and Fedora #
# firewall-cmd --permanent --add-service=http
# firewall-cmd --permanent --add-service=https

8) Setting Up External Command Pipe

Web interfaces and other Icinga addons are able to send commands to Icinga 2 through the external command pipe.

# enable the External Command Pipe #
# icinga2 feature enable command

# For SysVinit systems #
# service icinga2 restart

# For Systemd systems #
# systemctl restart icinga2.service

# Adding the webserver's user to the group icingacmd #
# usermod -a -G icingacmd apache

Ref : Icinga2 installation
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