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icinga2/doc/2.1-setting-up-icinga-2.md

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Setting up Icinga 2

First of all you will have to install Icinga 2. The preferred way of doing this is to use the official Debian or RPM package repositories depending on which operating system and distribution you are running.

Distribution Repository URL
Debian http://packages.icinga.org/debian/
Ubuntu http://packages.icinga.org/ubuntu/
RHEL/CentOS http://packages.icinga.org/epel/
OpenSUSE http://packages.icinga.org/openSUSE/
SLES http://packages.icinga.org/SUSE/

Packages for distributions other than the ones listed above may also be available. Please check http://packages.icinga.org/ to see if packages are available for your favourite distribution.

The packages for RHEL/CentOS 5 depend on other packages which are distributed as part of the EPEL repository. Please make sure to enable this repository.

You can install Icinga 2 by using your distribution's package manager to install the icinga2 package.

On RHEL/CentOS and SLES you will need to use chkconfig to enable the icinga2 service. You can manually start Icinga 2 using /etc/init.d/icinga2 start.

Some parts of Icinga 2's functionality are available as separate packages:

Name Description
icinga2-ido-mysql IDO provider module for MySQL
icinga2-ido-pgsql IDO provider module for PostgreSQL

In case you're running a distribution for which Icinga 2 packages are not yet available you will have to use the release tarball which you can download from the Icinga website. The release tarballs contain an INSTALL file with further instructions.

Installation Paths

By default Icinga 2 uses the following files and directories:

Path Description
/etc/icinga2 Contains Icinga 2 configuration files.
/etc/init.d/icinga2 The Icinga 2 init script.
/usr/bin/icinga2-* Migration and certificate build scripts.
/usr/sbin/icinga2* The Icinga 2 binary and feature enable/disable scripts.
/usr/share/doc/icinga2 Documentation files that come with Icinga 2.
/usr/share/icinga2/itl The Icinga Template Library.
/var/run/icinga2 PID file.
/var/run/icinga2/cmd Command pipe and Livestatus socket.
/var/cache/icinga2 status.dat/objects.cache.
/var/spool/icinga2 Used for performance data spool files.
/var/lib/icinga2 Icinga 2 state file, cluster feature replay log and configuration files.
/var/log/icinga2 Log file location and compat/ directory for the CompatLogger feature.

icinga2.conf

An example configuration file is installed for you in /etc/icinga2/icinga2.conf.

Here's a brief description of the example configuration:

/**
 * Icinga 2 configuration file
 * - this is where you define settings for the Icinga application including
 * which hosts/services to check.
 *
 * For an overview of all available configuration options please refer
 * to the documentation that is distributed as part of Icinga 2.
 */

Icinga 2 supports C/C++-style comments.

/**
 * The constants.conf defines global constants.
 */
include "constants.conf"

The include directive can be used to include other files.

/**
 * The Icinga Template Library (ITL) provides a number of useful templates
 * and command definitions.
 */
include <itl/itl.conf>

/**
 * The features-available directory contains a number of configuration
 * files for features which can be enabled and disabled using the
 * icinga2-enable-feature / icinga2-disable-feature tools. These two tools work by creating
 * and removing symbolic links in the features-enabled directory.
 */
include "features-enabled/*.conf"

This include directive takes care of including the configuration files for all the features which have been enabled with icinga2-enable-feature. See Enabling/Disabling Features for more details.

/**
 * Although in theory you could define all your objects in this file
 * the preferred way is to create separate directories and files in the conf.d
 * directory. Each of these files must have the file extension ".conf".
 */
include_recursive "conf.d"

You can put your own configuration files in the conf.d directory. This directive makes sure that all of your own configuration files are included.

constants.conf

The constants.conf configuration file can be used to define global constants:

/**
 * This file defines global constants which can be used in
 * the other configuration files. At a minimum the
 * PluginDir constant should be defined.
 */

const PluginDir = "/usr/lib/nagios/plugins"

localhost.conf

The conf.d/localhost.conf file contains our first host definition:

/**
 * A host definition. You can create your own configuration files
 * in the conf.d directory (e.g. one per host). By default all *.conf
 * files in this directory are included.
 */
object Host "localhost" {
  import "linux-server"

  address = "127.0.0.1"
  address6 = "::1"
}

This defines the host localhost. The import keyword is used to import the linux-server template which takes care of setting up the host check as well as adding the host to the linux-servers host group.

The vars attribute can be used to define custom attributes which are available for check and notification commands. Most of the templates in the Icinga Template Library require an address custom attribute.

object Service "icinga" {
  import "generic-service"

  host_name = "localhost"
  check_command = "icinga"
}

object Service "http" {
  import "generic-service"

  host_name = "localhost"
  check_command = "http_ip"
}

object Service "ssh" {
  import "generic-service"

  host_name = "localhost"
  check_command = "ssh"
}

object Service "load" {
  import "generic-service"

  host_name = "localhost"
  check_command = "load"
}

object ScheduledDowntime "backup-downtime" {
  import "backup-downtime"

  host_name = "localhost"
  service_name = "load"
}

object Service "processes" {
  import "generic-service"

  host_name = "localhost"
  check_command = "processes"
}

object Service "users" {
  import "generic-service"

  host_name = "localhost"
  check_command = "users"
}

object Service "disk" {
  import "generic-service"

  host_name = "localhost"
  check_command = "disk"
}

The command objects icinga, http_ip, ssh, load, processes, users and disk are all provided by the Icinga Template Library (ITL) which we enabled earlier by including the itl/itl.conf configuration file.