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<title>mod_disk_cache - Apache HTTP Server Version 2.2</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.2</p>
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.2</a> > <a href="./">Modules</a></div>
<div id="page-content">
<div class="retired"><h4>Please note</h4>
<p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
<p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_disk_cache.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_disk_cache</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English"> en </a> |
<a href="../ja/mod/mod_disk_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Content cache storage manager keyed to URIs</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>disk_cache_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_disk_cache.c</td></tr></table>
<h3>Summary</h3>
<p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> implements a disk based storage
manager. It is primarily of use in conjunction with
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
<p>Content is stored in and retrieved from the cache using URI based
keys. Content with access protection is not cached.</p>
<p><code class="program"><a href="../programs/htcacheclean.html">htcacheclean</a></code> can be used to maintain the cache
size at a maximum level.</p>
<div class="note"><h3>Note:</h3>
<p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> requires the services of
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>.</p>
</div>
<div class="note"><h3>Note:</h3>
<p><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> uses the sendfile feature to
serve files from the cache when supported by the platform, and
when enabled with <code class="directive"><a href="../mod/core.html#enablesendfile">EnableSendfile</a></code>.
However, per-directory and .htaccess configuration of
<code class="directive"><a href="../mod/core.html#enablesendfile">EnableSendfile</a></code> are ignored by
<code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> as the corresponding settings are not
available to the module when a request is being served from the
cache.</p>
</div>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlength">CacheDirLength</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#cachedirlevels">CacheDirLevels</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxfilesize">CacheMaxFileSize</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#cacheminfilesize">CacheMinFileSize</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#cacheroot">CacheRoot</a></li>
</ul>
<ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheDirLength" id="CacheDirLength">CacheDirLength</a> <a name="cachedirlength" id="cachedirlength">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of characters in subdirectory names</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLength <var>length</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLength 2</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
</table>
<p>The <code class="directive">CacheDirLength</code> directive sets the number
of characters for each subdirectory name in the cache hierarchy.</p>
<div class="note">
<p>The result of <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code>* <code class="directive">CacheDirLength</code>
must not be higher than 20.</p>
</div>
<div class="example"><p><code>
CacheDirLength 4
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheDirLevels" id="CacheDirLevels">CacheDirLevels</a> <a name="cachedirlevels" id="cachedirlevels">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The number of levels of subdirectories in the
cache.</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDirLevels <var>levels</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDirLevels 3</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
</table>
<p>The <code class="directive">CacheDirLevels</code> directive sets the number
of subdirectory levels in the cache. Cached data will be saved this
many directory levels below the <code class="directive"><a href="#cacheroot">CacheRoot</a></code> directory.</p>
<div class="note">
<p>The result of <code class="directive">CacheDirLevels</code>*
<code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> must
not be higher than 20.</p>
</div>
<div class="example"><p><code>
CacheDirLevels 5
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheMaxFileSize" id="CacheMaxFileSize">CacheMaxFileSize</a> <a name="cachemaxfilesize" id="cachemaxfilesize">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum size (in bytes) of a document to be placed in the
cache</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxFileSize <var>bytes</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMaxFileSize 1000000</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
</table>
<p>The <code class="directive">CacheMaxFileSize</code> directive sets the
maximum size, in bytes, for a document to be considered for storage in
the cache.</p>
<div class="example"><p><code>
CacheMaxFileSize 64000
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheMinFileSize" id="CacheMinFileSize">CacheMinFileSize</a> <a name="cacheminfilesize" id="cacheminfilesize">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum size (in bytes) of a document to be placed in the
cache</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMinFileSize <var>bytes</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMinFileSize 1</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
</table>
<p>The <code class="directive">CacheMinFileSize</code> directive sets the
minimum size, in bytes, for a document to be considered for storage
in the cache.</p>
<div class="example"><p><code>
CacheMinFileSize 64
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheRoot" id="CacheRoot">CacheRoot</a> <a name="cacheroot" id="cacheroot">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The directory root under which cache files are
stored</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheRoot <var>directory</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr>
</table>
<p>The <code class="directive">CacheRoot</code> directive defines the name of
the directory on the disk to contain cache files. If the <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code> module has been loaded or compiled in to the
Apache server, this directive <em>must</em> be defined. Failing to
provide a value for <code class="directive">CacheRoot</code> will result in
a configuration file processing error. The <code class="directive"><a href="#cachedirlevels">CacheDirLevels</a></code> and <code class="directive"><a href="#cachedirlength">CacheDirLength</a></code> directives define
the structure of the directories under the specified root directory.</p>
<div class="example"><p><code>
CacheRoot c:/cacheroot
</code></p></div>
</div>
</div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/mod/mod_disk_cache.html" title="English"> en </a> |
<a href="../ja/mod/mod_disk_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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