resolv_conf

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 resolv_conf
   • What resolv_conf affects
   • Setup requirements
   • Beginning with resolv_conf
4. Usage - Configuration options and additional functionality
5. Reference - An under-the-hood peek at what the module is doing and how
6. Development - Guide for contributing to the module

Overview

Manage the /etc/resolv.conf on Linux and FreeBSD.

Module Description

The module manages the DNS resolver configuration file. It allows setting the values for the nameserver, domain, search, sortlist and options confguration settings. The following restrictions are enforced by the module:

• Up to 3 nameservers may be listed.
• Up to 6 items may be included in the search list.
• Up to 10 items may be included in the sortlist.
• The domain and search keywords are mutually exclusive.

Setup

What resolv_conf affects

The module creates and manages the content of the /etc/resolv.conf file. This affects the way the host is able to map hostname to IP addresses and vice versa.

Setup Requirements

The module uses the Puppet stdlib module.

Beginning with resolv_conf

Declare the class to create a configuration that uses only a local nameserver on 127.0.0.1.

class { 'resolv_conf': }

Usage

You can use class parameters to use a customized configuration.

class { 'resolv_conf':
  nameserves => [ '9.9.9.9', ],
}

You can also use Hiera to create this configuration.

resolv_conf::nameservers:
  - '9.9.9.9'

Specify a remote nameserver and use local domain for unqualified hostnames

The following configuration will configure a remote nameserver and use the name of the local domain when unqualified hostnames are queried.

class { 'resolv_conf':
  nameservers => [ '9.9.9.9', ],
  domain      => $::domain,
}

If your host is based in the example.net domain, then a lookup for the hostname server will query the nameserver for server.example.net.

Specify nameservers & options

This setup creates a configuration file with the given nameservers and will also set additional opions to enable nameserver rotation and set a specific timeout.

class { 'resolv_conf':
  nameservers => [ '8.8.8.8', '8.8.4.4', ],
  options     => [ 'rotate', 'timeout:2', ],
}

Prefer a local nameserver

The following setup will create a configuration where the nameserver at 127.0.0.1 is queried first and only then the additional nameservers are used.

class { 'resolv_conf':
  nameservers              => [ '8.8.8.8', '8.8.4.4', ],
  prepend_local_nameserver => true,
}

Note: This module does not configure a local nameserver that will answer queries on 127.0.0.1. You will have to use a different Puppet module to manage the nameserver.

Reference

See REFERENCE.md

Development

You may open Github issues for this module if you need additional options currently not available.

Feel free to send pull requests for new features.