#puppet-icinga2

---

This module installs and configures the Icinga 2 monitoring system. It can also install and configure NRPE on client systems that are being monitored by an Icinga 2 server.

The module has only been tested on CentOS 6.5 and Ubuntu 12.04 and 14.04. Red Hat and other EL derivatives, like Fedora, should work, but have not been tested.

Currently, this module does not install or configure any web UIs for Icinga 2. This module also does not install or configure a mail transfer agent (MTA) to send outgoing alert emails.

While NRPE is required for Icinga 2 to check non-network-reachble things on client machines (CPU, load average, etc.), this module itself doesn't have any dependencies between the server component (the icinga2::server class) and client component (the icinga2::nrpe class). Either one can be used independently of the other.

###Requirements

For Ubuntu systems, this module requires the Puppet Labs apt module.

On EL-based systems (CentOS, Red Hat Enterprise Linux, Fedora, etc.), the EPEL package repository is required.

####Server requirements

Icinga 2 requires either a MySQL or a Postgres database.

Currently, this module does not set up any databases. You'll have to create one before installing Icinga 2 via the module.

If you would like to set up your own database, either of the Puppet Labs MySQL or Postgres modules can be used.

Database connection parameters can be specified by the db_host, db_port, db_name, db_user and db_password parameters.

The example below shows the Puppet Labs Postgres module being used to install Postgres and create a database and database user for Icinga 2:

  class { 'postgresql::server': }

  postgresql::server::db { 'icinga2_data':
    user     => 'icinga2',
    password => postgresql_password('icinga2', 'password'),
  }

For production use, you'll probably want to get the database password via a Hiera lookup so the password isn't sitting in your site manifests in plain text.

To configure Icinga with the password you set up for the Postgres Icinga user, use the server_db_password parameter (shown here with a Hiera lookup):

  class { 'icinga2::server':
    server_db_password => hiera('icinga_db_password_key_here')
  }

###Usage

####Server usage

To install Icinga 2 with a Postgres database, first set up the database.

Once the database is set up, use the icinga2::server class with the database connection parameters to specify

#Install Icinga 2:
class { 'icinga2::server': 
  server_db_type => 'pgsql',
  db_host => 'localhost'
  db_port => '5432'
  db_name => 'icinga2_data'
  db_user => 'icinga2'
  db_password => 'password',
}

When the server_db_type parameter is set, the right IDO database connection packages are automatically installed and the schema is loaded.

Note: For production use, you'll probably want to get the database password via a Hiera lookup so the password isn't sitting in your site manifests in plain text:

#Install Icinga 2:
class { 'icinga2::server': 
  server_db_type => 'pgsql',
  db_host => 'localhost'
  db_port => '5432'
  db_name => 'icinga2_data'
  db_user => 'icinga2'
  db_password => hiera('icinga_db_password_key_here'),
}

Note: If you will be installing NRPE or the Nagios plugins packages with the icinga2::nrpe class on a node that also has the icinga2::server class applied, be sure to set the $server_install_nagios_plugins parameter in your call to icinga2::server to false:

#Install Icinga 2:
class { 'icinga2::server': 
  ...
  server_install_nagios_plugins => false,
  ...
 }

This will stop the icinga2::server class from trying to install the plugins pacakges, since the icinga2::nrpe class will already be installing them and will prevent a resulting duplicate resource error.

####Client usage

To install NRPE and allow the local machine and Icinga 2 servers (or Icinga 1 or plain old Nagios servers) with various IP addresess to connect:

class { 'icinga2::nrpe':
  nrpe_allowed_hosts => ['10.0.1.79', '10.0.1.80', '10.0.1.85', '127.0.0.1'],
}

Note: If you would like to install NRPE on a node that also has the icinga2::server class applied, be sure to set the $server_install_nagios_plugins parameter in your call to icinga2::server to false:

#Install Icinga 2:
class { 'icinga2::server': 
  server_db_type => 'pgsql',
  server_install_nagios_plugins => false,
 }

This will stop the icinga2::server class from trying to install the plugins pacakges, since the icinga2::nrpe class will already be installing them and will prevent a resulting duplicate resource error.

####Object type usage

This module includes several defined types that can be used to automatically generate Icinga 2 format object definitions. They function in a similar way to the built-in Nagios types that are included in Puppet.

#####Exported resources

Like the built-in Nagios types, they can be exported to PuppetDB as virtual resources and collected on your Icinga 2 server.

Nodes that are being monitored can have the @@ virtual resources applied to them:

@@icinga2::object::host { $::fqdn:
  display_name => $::fqdn,
  ipv4_address => $::ipaddress_eth0,
  groups => ['linux_servers', 'mysql_servers'],
  vars => {
    os              => 'linux',
    virtual_machine => 'true',
    distro          => $::operatingsystem,
  },
  target_dir => '/etc/icinga2/objects/hosts',
  target_file_name => "${fqdn}.conf"
}

Then, on your Icinga 2 server, you can collect the exported virtual resources (notice the camel casing in the class name):

#Collect all @@icinga2::object::host resources from PuppetDB that were exported by other machines:
Icinga2::Object::Host <<| |>> { }

Unlike the built-in Nagios types, the file owner, group and mode of the automatically generated files can be controlled via the target_file_owner, target_file_group and target_file_mode parameters:

@@icinga2::object::host { $::fqdn:
  display_name => $::fqdn,
  ipv4_address => $::ipaddress_eth0,
  groups => ['linux_servers', 'mysql_servers'],
  vars => {
    os              => 'linux',
    virtual_machine => 'true',
    distro          => $::operatingsystem,
  },
  target_dir => '/etc/icinga2/objects/hosts',
  target_file_name => "${fqdn}.conf"
  target_file_owner = 'root',
  target_file_group = 'root',
  target_file_mode = '644'
}

#####undef and default object values

Most of the object parameters in the Puppet module are set to undef.

This means that they will not be added to the rendered object definition files.

However, this doesn't mean that the values are not set. Icinga 2 itself has default values for many object parameters and falls back to them if one isn't present in an object definition. See the docs for individual object types in Configuring Icinga 2 for more info about which object parameters have what default values.

#####icinga2::object::host

Note: The ipv6_address parameter is set to undef by default. This is because facter can return either IPv4 or IPv6 addresses for the ipaddress_ethX facts. The default value for the ipv6_address parameter is set to undef and not ipaddress_eth0 so that an IPv4 address isn't set as the value for address6 in the rendered host definition.

If you would like to use an IPv6 address, make sure to set the ipv6_address parameter to the ipaddress_ethX fact that will give you the right IPv6 address for the machine:

@@icinga2::object::host { $::fqdn:
  display_name => $::fqdn,
  ipv6_address => $::ipaddress_eth1,
....
}