Icinga 2 is an open-source monitoring software that allows you to monitor the performance and availability of your network resources, such as servers, services, and applications. In this article, we will learn how to install Icinga 2 on Ubuntu 20.04.

Prerequisites

Before we begin, make sure that you have a clean installation of Ubuntu 20.04 and a user with sudo privileges. You will also need to have the apt-transport-https and gnupg2 packages installed.

To check if the apt-transport-https and gnupg2 packages are installed, run the following commands:

dpkg -s apt-transport-https
dpkg -s gnupg2

If the packages are installed, you should see a message saying Status: install ok installed for each package. If either package is not installed, you will need to install it by running the following command:

sudo apt install apt-transport-https gnupg2

Installing Icinga 2

To install Icinga 2, we will first add the Icinga 2 repository to the apt package manager. To do this, run the following commands:

wget -O - <https://icinga.com/icinga.key> | apt-key add -
echo "deb <http://packages.icinga.com/ubuntu> icinga-bionic main" | tee /etc/apt/sources.list.d/icinga2.list
apt-get update

These commands will add the Icinga 2 repository to the list of available repositories and update the package index.

Next, we will install Icinga 2 and the necessary dependencies by running the following command:

apt-get install icinga2

This will install Icinga 2 and the necessary dependencies on your system.

After the installation is complete, you can verify that Icinga 2 is installed correctly by running the following command:

icinga2 -v

This command should print the version of Icinga 2 that is installed on your system, which indicates that Icinga 2 is installed and working correctly.

Configuring Icinga 2

After Icinga 2 is installed, you can start configuring it to monitor your network resources. Icinga 2 uses a configuration file called icinga2.conf to define the monitoring rules and settings.

To edit the icinga2.conf file, you can use a text editor such as nano or vi. For example, to edit the file using nano, run the following command:

nano /etc/icinga2/icinga2.conf

In the icinga2.conf file, you can define the monitoring rules and settings for your network resources. For example, you can specify the IP addresses or hostnames of the servers that you want to monitor, the services that you want to monitor on each server, and the thresholds for availability and performance.

For more information on how to configure Icinga 2, you can refer to the official documentation at https://icinga.com/docs/icinga2/latest/doc/01-about/.

Starting Icinga 2

After you have configured Icinga 2, you can start the Icinga 2 service by running the following command:

systemctl start icinga2

This will start the Icinga 2 service and begin monitoring your network resources according to the rules and settings defined in the icinga2.conf file.

To verify that the Icinga 2 service is running, you can run the following command:

systemctl status icinga2

This command should print the status of the Icinga 2 service, which should be active (running) if the service is running correctly.

Accessing the Icinga 2 Web Interface

Icinga 2 comes with a web-based user interface that allows you to monitor your network resources and view the monitoring data. To access the Icinga 2 web interface, you need to open a web browser and go to the following URL:

<http://localhost:8080/icingaweb2>

This will open the Icinga 2 login page, where you can enter the username and password that you configured during the installation process.

After you log in, you will see the Icinga 2 dashboard, which shows an overview of the monitoring data and alerts for your network resources. You can use the dashboard to view the status of your network resources, view detailed information about individual resources, and configure the monitoring rules and settings.

Conclusion

In this article, we learned how to install and configure Icinga 2 on Ubuntu 20.04. We installed Icinga 2, edited the configuration file to define the monitoring rules and settings, started the Icinga 2 service, and accessed the Icinga 2 web interface. Icinga 2 is a powerful monitoring tool that allows you to monitor the performance and availability of your network resources.