Welcome to out guide on how to install Icinga 2 on CentOS 8 / RHEL 8 with Icinga Web 2. Icinga 2 is a free and open source monitoring tool designed to be scalable and extensible Icinga 2 checks the availability of your network resources, notifies users of outages, and generates performance data for reporting. Icinga 2 can be used to monitor large and complex environments across multiple locations.
With Icinga 2 you can monitor:
- Server resources – RAM usage, CPU load, disk usage
- Network services – HTTP, HTTPS, SMTP, IMAP, POP3, NNTP, ping e.t.c
- Network devices – Routers and switches
Features of Icinga 2
These are the top features which Icinga 2 provides:
- Performance-oriented: Icinga 2 has a multi-threaded design, it can run thousands of checks each second without any sign of CPU strain.
- Distributed Architecture: For large and complex environments do a distributed setup with high availability.
- REST API: Icinga 2 provides a RESTful API which enables you to update your configurations on the fly or show live information about current problems on your custom dashboards.
- Rule-based Configuration: Monitoring as code with dynamic configurations. Apply rules to hosts and services to create a continuous monitoring environment.
- Alerting: You get instant notifications when problems occur via email, text message or mobile message applications.
- Icinga 2 has native support for Graphite and InfluxDB. You can easily send performance data gathered directly to the third party tools.
- Icinga 2 support NagiosGrapher, PNP4Nagios, and InGraph addons
The standard web interface for Icinga 2 is called Icinga Web 2
Install Icinga 2 on CentOS 8 / RHEL 8
Let’s now begin the installation of Icinga 2 on CentOS 8 / RHEL 8. Below are the steps you’ll follow to ensure you have a running Icinga 2 on CentOS 8 / RHEL 8 Linux distribution.
Step 1: Update system
Ensure your CentOS / RHEL system is up-to-date:
sudo yum -y updateStep 2: Enable EPEL Repository
Ensure EPEL repository is enabled in your RHEL 8 / CentOS 8 system.
One line command to run is:
sudo dnf -y install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
sudo dnf config-manager --set-enabled powertoolsIf you’re running RHEL 8, consider enabling additional repositories.
sudo subscription-manager repos --enable=rhel-8-server-optional-rpms --enable=rhel-8-server-extras-rpmsStep 3: Add Icinga 2 Repository to CentOS 8 / RHEL 8
After addition of EPEL repository, add Icinga 2 repository to your system.
sudo dnf -y install https://packages.icinga.com/epel/icinga-rpm-release-8-latest.noarch.rpmUpdate Yum cache
sudo dnf clean all
sudo dnf makecacheStep 4: Install MariaDB Database Server
Install MariaDB database server on your CentOS / RHEL 8 server.
After installation, create database and user for Icinga2:
$ mysql -u root -p
CREATE DATABASE icinga;
GRANT ALL PRIVILEGES ON icinga.* TO 'icinga'@'localhost' IDENTIFIED BY 'StroNgP@ss';
FLUSH PRIVILEGES;
EXIT;Step 5: Install Icinga 2 on CentOS 8 / RHEL 8
Run the commands below to install Icinga 2 on CentOS 8 / RHEL 8.
sudo dnf install icinga2 icinga2-selinux icinga2-ido-mysql vim-icinga2 nagios-plugins-allBelow is the dependency tree:
Dependencies resolved.
======================================================================================================================================================================================================
....
Transaction Summary
======================================================================================================================================================================================================
Install 15 Packages
Total download size: 5.4 M
Installed size: 26 M
Is this ok [y/N]: y
Start and enable
Enable Icinga 2 required modules:
sudo icinga2 feature enable command ido-mysql syslogYou can check and enable other features on demand:
$ sudo icinga2 feature list
Disabled features: api compatlog debuglog elasticsearch gelf graphite influxdb livestatus opentsdb perfdata statusdata syslog
Enabled features: checker command ido-mysql mainlog notificationImport Icinga 2 Database:
mysql -u root -p icinga < /usr/share/icinga2-ido-mysql/schema/mysql.sqlConfigure Database access:
sudo vim /etc/icinga2/features-available/ido-mysql.conf
Uncomment the lines and set access credentials.
/**
* The IdoMysqlConnection type implements MySQL support
* for DB IDO.
*/
object IdoMysqlConnection "ido-mysql" {
user = "icinga"
password = "StroNgP@ss"
host = "localhost"
database = "icinga"
}Then start and enable icinga2 service.
sudo systemctl enable --now icinga2.serviceConfirm service status.
$ systemctl status icinga2.service
● icinga2.service - Icinga host/service/network monitoring system
Loaded: loaded (/usr/lib/systemd/system/icinga2.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2019-11-12 10:27:10 EAT; 6s ago
Process: 13756 ExecStartPre=/usr/lib/icinga2/prepare-dirs /etc/sysconfig/icinga2 (code=exited, status=0/SUCCESS)
Main PID: 13766 (icinga2)
Tasks: 11 (limit: 11512)
Memory: 16.6M
CGroup: /system.slice/icinga2.service
├─13766 /usr/lib64/icinga2/sbin/icinga2 --no-stack-rlimit daemon --close-stdio -e /var/log/icinga2/error.log
├─13781 /usr/lib64/icinga2/sbin/icinga2 --no-stack-rlimit daemon --close-stdio -e /var/log/icinga2/error.log
└─13782 /usr/lib64/icinga2/sbin/icinga2 --no-stack-rlimit daemon --close-stdio -e /var/log/icinga2/error.log
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 1 UserGroup.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 1 IdoMysqlConnection.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 235 CheckCommands.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 3 TimePeriods.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 1 User.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 11 Services.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ConfigItem: Instantiated 3 ServiceGroups.
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/ScriptGlobal: Dumping variables to file '/var/cache/icin>
Nov 12 10:27:10 centos8.novalocal icinga2[13766]: [2019-11-12 10:27:10 +0300] information/cli: Closing console log.
Nov 12 10:27:10 centos8.novalocal systemd[1]: Started Icinga host/service/network monitoring system.Install Icinga Web 2 on CentOS 8 / RHEL 8
Now that we’ve completed the installation of Icinga 2 on CentOS 8 / RHEL 8 server, let’s move on to install Icinga Web 2 on CentOS 8 / RHEL 8. Refer to the guide below for installation steps:
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