Icinga 2 Puppet Module

Table of Contents

1. Overview
2. Module Description - What the module does and why it is useful
3. Setup - The basics of getting started with icinga2
4. Usage - Configuration options and additional functionality
   • Installing Icinga
   • Clustering Icinga
   • Config Objects
   • Reading objects from hiera
   • Apply Rules
   • Custom configuration
5. How Configuration is parsed
6. Reference
7. Release Notes

Overview

Icinga 2 is a widely used open source monitoring software. This Puppet module helps with installing and managing configuration of Icinga 2 on multiple operating systems.

What's new in version 3.0.0

• The current version now uses the icinga :: repos class from the new icinga module for the configuration of repositories including EPEL on RedHat and Backports on Debian. (see https://github.com/icinga/puppet-icinga)
• manage_repos will replace manage_repo in the future
• manage_packages will replace manage_package in the future
• Since Icinga v2.12.0 the fingerprint to validate certificates is a sha256 instead of a sha1. Both is supported now.

Module Description

This module installs and configures Icinga 2 on your Linux or Windows hosts.

By default it uses packages provided by your distribution's repository or Chocolatey on Windows.

The module can also be configured to use packages.icinga.com as the primary repository, which enables you to install Icinga 2 versions that are newer than the ones provided by your distribution's vendor. All features and objects available in Icinga 2 can be enabled and configured with this module.

Setup

What the Icinga 2 Puppet module supports

• Installation of packages
• Configuration of features
• Configuration of objects (also apply rules)
• Service
• MySQL / PostgreSQL Database Schema Import
• Repository Management
• Certification Authority

Dependencies

This module supports:

• [puppet] >= 4.10 < 8.0.0

And depends on:

• puppetlabs/stdlib >= 5.0.0 < 8.0.0
  • If Puppet 6 is used a stdlib 5.1 or higher is required, see https://github.com/Icinga/puppet-icinga2/issues/505
• puppetlabs/concat >= 2.1.0 < 8.0.0
• [icinga/icinga] >= 1.0.0 < 3.0.0
  • needed if manage_repos is set to true

Limitations

This module has been tested on:

• Ruby >= 1.9
• Debian 8, 9, 10
• Ubuntu 16.04, 18.04, 20.04
• CentOS/RHEL 6, 7, 8
• Fedora 31
• FreeBSD 10, 11
• SLES 12, 15
• Windows Server 2016

Other operating systems or versions may work but have not been tested.

Usage

Installing Icinga

The default class icinga2 installs and configures a basic installation of Icinga 2. The features checker, mainlog and notification are enabled by default.

By default, your distribution's packages are used to install Icinga 2. On Windows systems we use the Chocolatey package manager.

Use the manage_repos parameter to configure repositories by default the official and stable packages.icinga.com. To configure your own repositories, or use the official testing or nightly snapshot stage, see https://github.com/icinga/puppet-icinga.

class { '::icinga2':
  manage_repos => true,
}

If you want to manage the version of Icinga 2, you have to disable the package management of this module and handle packages in your own Puppet code. The attribute manage_repos is disabled by default and you have to manage a repository within icinga in front of the package resource. You can combine this one with the section before about repositories.

# class of extra module icinga/icinga
include ::icinga::repos

package { 'icinga2':
  ensure => latest,
  notify => Class['icinga2'],
}

class { '::icinga2':
  manage_package => false,
}

Note: Be careful with this option: Setting manage_package to false means that this module will not install any package at all, including IDO packages!

Clustering Icinga

Icinga 2 can run in three different roles:

• in a master zone which is on top of the hierarchy
• in a satellite zone which is a child of a satellite or master zone
• a standalone client node/zone which works as an agent connected to master and/or satellite zones

To learn more about Icinga 2 Clustering, follow the official docs on distributed monitoring. The following examples show how these roles can be configured using this Puppet module.

Master

A Master zone has no parent and is usually also the place where you enable the IDO and notification features. A master sends configurations over the Icinga 2 protocol to satellites and/or clients.

More detailed examples can be found in the [examples] directory.

This example creates the configuration for a master that has one satellite connected. A global zone is created for templates, and all features of a typical master are enabled.

class { '::icinga2':
  confd     => false,
  constants => {
    'ZoneName'   => 'master',
    'TicketSalt' => '5a3d695b8aef8f18452fc494593056a4',
  },
}

class { '::icinga2::feature::api':
  pki             => 'none',
  accept_commands => true,
  # when having multiple masters, you have to enable:
  accept_config => true,
  endpoints       => {
    'master.example.org'    => {},
    'satellite.example.org' => {
      'host' => '172.16.2.11'
    },
  },
  zones           => {
    'master' => {
      'endpoints' => ['master.example.org'],
    },
    'dmz'    => {
      'endpoints' => ['satellite.example.org'],
      'parent'    => 'master',
    },
  }
}

# to enable a CA on this instance you have to declare. Only one instance is allowed to be a CA:
include ::icinga2::pki::ca

icinga2::object::zone { 'global-templates':
  global => true,
}

Satellite

A satellite has a parent zone and one or multiple child zones. Satellites are usually created to distribute the monitoring load or to reach delimited zones in the network. A satellite either executes checks itself or delegates them to a client.

The satellite has fewer features enabled, but executes checks similar to a master. It connects to a master zone, and to a satellite or client below in the hierarchy. As parent acts either the master zone, or another satellite zone.

class { '::icinga2':
  confd     => false,
  # setting dedicated feature list to disable notification
  features  => ['checker','mainlog'],
  constants => {
    'ZoneName' => 'dmz',
  },
}

class { '::icinga2::feature::api':
  accept_config   => true,
  accept_commands => true,
  ca_host         => '172.16.1.11',
  ticket_salt     => '5a3d695b8aef8f18452fc494593056a4',
  # to increase your security set fingerprint to validate the certificate of ca_host
  # fingerprint     => 'D8:98:82:1B:14:8A:6A:89:4B:7A:40:32:50:68:01:D8:98:82:1B:14:8A:6A:89:4B:7A:40:32:99:3D:96:72:72',
  endpoints       => {
    'satellite.example.org' => {},
    'master.example.org'    => {
      'host' => '172.16.1.11',
    },
  },
  zones           => {
    'master' => {
      'endpoints' => ['master.example.org'],
    },
    'dmz'    => {
      'endpoints' => ['satellite.example.org'],
      'parent'    => 'master',
    },
  }
}

icinga2::object::zone { 'global-templates':
  global => true,
}

Agent

Icinga 2 runs as a client usually on each of your servers. It receives config or commands from a satellite or master zones and runs the checks that have to be executed locally.

The client is connected to the satellite, which is the direct parent zone.

class { '::icinga2':
  confd     => false,
  features  => ['mainlog'],
}

class { '::icinga2::feature::api':
  accept_config   => true,
  accept_commands => true,
  ticket_salt     => '5a3d695b8aef8f18452fc494593056a4',
  # to increase your security set fingerprint to validate the certificate of ca_host
  # fingerprint     => 'D8:98:82:1B:14:8A:6A:89:4B:7A:40:32:50:68:01:D8:98:82:1B:14:8A:6A:89:4B:7A:40:32:99:3D:96:72:72',
  endpoints       => {
    'NodeName'              => {},
    'satellite.example.org' => {
      'host' => '172.16.2.11',
    },
  },
  zones           => {
    'ZoneName' => {
      'endpoints' => ['NodeName'],
      'parent'    => 'dmz',
    },
    'dmz'      => {
      'endpoints' => ['satellite.example.org'],
    },
  }
}

icinga2::object::zone { 'global-templates':
  global => true,
}

The parameter fingerprint is optional and new since v2.1.0. It's used to validate the certificate of the CA host. You can get the fingerprint via openssl x509 -noout -fingerprint -sha256 -inform pem -in master.crt on the master host. (Icinga2 versions before 2.12.0 require '-sha1' as digest algorithm.)

Config Objects

With this module you can create almost every object that Icinga 2 knows about. When creating objects some parameters are required. This module sets the same requirements as Icinga 2 does. When creating an object you must set a target for the configuration.

Here are some examples for some object types:

Host

icinga2::object::host { 'srv-web1.fqdn.com':
  display_name  => 'srv-web1.fqdn.com',
  address       => '127.0.0.1',
  address6      => '::1',
  check_command => 'hostalive',
  target        => '/etc/icinga2/conf.d/srv-web1.fqdn.com.conf',
}

Service

icinga2::object::service { 'uptime':
  host_name      => 'srv-web1.fqdn.com',
  display_name   => 'Uptime',
  check_command  => 'check_uptime',
  check_interval => '600m',
  groups         => ['uptime', 'linux'],
  target         => '/etc/icinga2/conf.d/uptime.conf',
}

Hostgroup

icinga2::object::hostgroup { 'monitoring-hosts':
  display_name => 'Linux Servers',
  groups       => [ 'linux-servers' ],
  target       => '/etc/icinga2/conf.d/groups2.conf',
  assign       => [ 'host.vars.os == linux' ],
}

Reading objects from hiera

The following example shows how icinga2 objects can be read from a hiera datastore. See also examples/objects_from_hiera.pp.

class { 'icinga2':
  manage_repos => true,
}

$defaults = lookup('monitoring::defaults', undef, undef, {})

lookup('monitoring::objects').each |String $object_type, Hash $content| {
  $content.each |String $object_name, Hash $object_config| {
    ensure_resource(
      $object_type,
      $object_name,
      deep_merge($defaults[$object_type], $object_config))
  }
}

The datastore could be like:

---
monitoring::objects:
  'icinga2::object::host':
    centos7.localdomain:
      address: 127.0.0.1
      vars:
        os: Linux
  'icinga2::object::service':
    ping4:
      check_command: ping4
      apply: true
      assign:
        - host.address
    ssh:
      check_command: ssh
      apply: true
      assign:
        - host.address && host.vars.os == Linux

monitoring::defaults:
  'icinga2::object::host':
    import:
      - generic-host
    target: /etc/icinga2/conf.d/hosts.conf
  'icinga2::object::service':
    import:
      - generic-service
    target: /etc/icinga2/conf.d/services.conf

Apply Rules

Some objects can be applied to other objects. To create a simple apply rule you must set the apply parameter to true. If this parameter is set to a string, this string will be used to build an apply for loop. A service object always targets a host object. All other objects need to explicitly set an apply_target

Apply a SSH service to all Linux hosts:

icinga2::object::service { 'SSH':
  target        => '/etc/icinga2/conf.d/test.conf',
  apply         => true,
  assign        => [ 'host.vars.os == Linux' ],
  ignore        => [ 'host.vars.os == Windows' ],
  display_name  => 'Test Service',
  check_command => 'ssh',
}

Apply notifications to services:

icinga2::object::notification { 'testnotification':
  target       => '/etc/icinga2/conf.d/test.conf',
  apply        => true,
  apply_target => 'Service',
  assign       => [ 'host.vars.os == Linux' ],
  ignore       => [ 'host.vars.os == Windows' ],
  user_groups  => ['icingaadmins']
}

Assign all Linux hosts to a hostgroup:

icinga2::object::hostgroup { 'monitoring-hosts':
  display_name => 'Linux Servers',
  groups       => [ 'linux-servers' ],
  target       => '/etc/icinga2/conf.d/groups2.conf',
  assign       => [ 'host.vars.os == linux' ],
}

A loop to create HTTP services for all vHosts of a host object:

icinga2::object::service { 'HTTP':
  target        => '/etc/icinga2/conf.d/http.conf',
  apply         => 'http_vhost => config in host.vars_http_vhost',
  assign        => [ 'host.vars.os == Linux' ],
  display_name  => 'HTTP Service',
  check_command => 'http',
}

Custom Configuration

Sometimes it's necessary to cover very special configurations, that you cannot handle with this module. In this case you can use the icinga2::config::file tag on your file resource. The module collects all file resource types with this tag and triggers a reload of Icinga 2 on a file change.

include ::icinga2

file { '/etc/icinga2/conf.d/for-loop.conf':
  ensure => file,
  source => '...',
  tag    => 'icinga2::config::file',
}

How Configuration is parsed

To generate a valid Icinga 2 configuration all object attributes are parsed. This simple parsing algorithm takes a decision for each attribute, whether part of the string is to be quoted or not, and how an array or dictionary is to be formatted.

Parsing of a single attribute can be disabled by tagging it with -: at the front of the string.

   attr => '-:"unparsed string with quotes"'

An array, a hash or a string can be assigned to an object attribute. True and false are also valid values.

Hashes and arrays are created recursively, and all parts – such as single items of an array, keys and its values are parsed separately as strings.

Strings are parsed in chunks, by splitting the original string into separate substrings at specific keywords (operators) such as +, -, in, &&, ||, etc.

NOTICE: This splitting only works for keywords that are surrounded by whitespace, e.g.:

   attr => 'string1 + string2 - string3'

The algorithm will loop over the parameter and start by splitting it into 'string1' and 'string2 - string3'. 'string1' will be passed to the sub function 'value_types' and then the algorithm will continue parsing the rest of the string ('string2 - string3'), splitting it, passing it to value_types, etc.

Brackets are parsed for expressions:

  attr => '3 * (value1 - value2) / 2'

The parser also detects function calls and will parse all parameters separately.

  attr => 'function(param1, param2, ...)'

True and false can be used as either booleans or strings.

  attrs => true or  attr => 'true'

In Icinga you can write your own lambda functions with {{ ... }}. For Puppet use:

  attrs => '{{ ... }}'

The parser analyzes which parts of the string have to be quoted and which do not.

As a general rule, all fragments are quoted except for the following:

• Boolean: true, false
• Numbers: 3 or 2.5
• Time Intervals: 3m or 2.5h (s = seconds, m = minutes, h = hours, d = days)
• Functions: {{ ... }} or function () {}
• All constants, which are declared in the constants parameter in main class icinga2
  • NodeName
• Names of attributes that belong to the same type of object:
  • e.g. name and check_command for a host object
• All attributes or variables (custom attributes) from the host, service or user contexts:
  • host.name, service.check_command, user.groups, ...

Assignment with += and -=:

Now it's possible to build an Icinga DSL code snippet like

  vars += config

simply use a string with the prefix '+ ', e.g.

  vars => '+ config',

The blank between + and the proper string 'config' is imported for the parser because numbers

  attr => '+ -14',

are also possible now. For numbers -= can be built, too:

  attr => '- -14',

Arrays can also be marked to merge with '+' or reduce by '-' as the first item of the array:

  attr => [ '+', item1, item2, ... ]

Result: attr += [ item1, item2, ... ]

  attr => [ '-', item1, item2, ... ]

Result: attr -= [ item1, item2, ... ]

That all works for attributes and custom attributes!

Finally dictionaries can be merged when a key '+' is set:

  attr => {
    '+'    => true,
    'key1' => 'val1',
  }

Result:

  attr += {
    "key1" = "val1"
  }

If 'attr' is a custom attribute this just works since level 3 of the dictionary:

  vars => {
    'level1' => {
      'level2' => {
        'level3' => {
          '+' => true,
          ...
        },
      },
    },
  },

Parsed to:

  vars.level1["level2"] += level3

Now it's also possible to add multiple custom attributes:

  vars => [
    {
      'a' => '1',
      'b' => '2', 
    },
    'config',
    { 
      'c' => { 
        'd' => { 
          '+' => true,
          'e' => '5',
        },
      },
    },
  ],

And you'll get:

  vars.a = "1"
  vars.b = "2"
  vars += config
  vars.c["d"] += {
    "e" = "5"
  }

Note: Using an Array always means merge '+=' all items to vars.

What isn't supported?

It's not currently possible to use dictionaries in a string WITH nested array or hash, like

  attr1 => 'hash1 + { item1 => value1, item2 => [ value1, value2 ], ... ]'
  attr2 => 'hash2 + { item1 => value1, item2 => { ... },... }'

Reference

See REFERENCE.md

Release Notes

When releasing new versions we refer to SemVer 1.0.0 for version numbers. All steps required when creating a new release are described in RELEASE.md

See also CHANGELOG.md