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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>12. Geo backend</title><link rel="stylesheet" href="docbook.css" type="text/css" /><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="PowerDNS manual" /><link rel="up" href="backends-detail.html" title="Appendix A. Backends in detail" /><link rel="prev" href="opendbx.html" title="11. OpenDBX backend" /><link rel="next" href="luabackend.html" title="13. Lua Backend" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">12. Geo backend</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="opendbx.html">Prev</a> </td><th width="60%" align="center">Appendix A. Backends in detail</th><td width="20%" align="right"> <a accesskey="n" href="luabackend.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="12. Geo backend"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="geo"></a>12. Geo backend</h2></div></div></div><p>
</p><div class="warning" title="Warning" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Warning"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="warning.png" /></td><th align="left">Warning</th></tr><tr><td align="left" valign="top"><p>
This section is a subset of the full documentation which can be found in <code class="filename">modules/geobackend/README</code> of
the PowerDNS distribution.
</p></td></tr></table></div><p>
</p><p>
The main author for this module is Mark Bergsma.
</p><p>
</p><div class="table"><a id="idp9731264"></a><p class="title"><b>Table A.11. Geo backend capabilities</b></p><div class="table-contents"><table summary="Geo backend capabilities" border="1"><colgroup><col /><col /></colgroup><tbody><tr><td>Native</td><td>Partial</td></tr><tr><td>Master</td><td>No</td></tr><tr><td>Slave</td><td>No</td></tr><tr><td>Superslave</td><td>No</td></tr><tr><td>Autoserial</td><td>No</td></tr><tr><td>DNSSEC</td><td>Yes (no key storage)</td></tr></tbody></table></div></div><p><br class="table-break" />
</p><p>
The Geo Backend can be used to distribute queries globally using an IP-address/country mapping table, several of which are freely available
online or can be acquired for a small fee.
</p><p>
This allows visitors to be sent to a server close to them, with no appreciable delay, as would otherwise be incurred with a protocol level redirect.
Additionally, the Geo Backend can be used to provide service over several clusters, any of which can be taken out of use easily, for example
for maintenance purposes.
</p><p>
The Geo Backend is in wide use, for example by the Wikimedia foundation, which uses it to power the Wikipedia global load balancing.
</p><p>
More details can be found <a class="ulink" href="http://wiki.powerdns.com/cgi-bin/trac.fcgi/browser/trunk/pdns/modules/geobackend/README" target="_top">here</a>, or in
<code class="filename">modules/geobackend/README</code>, part of the PowerDNS Authoritative Server distribution.
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