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| <title>mod_disk_cache - Apache HTTP Server</title> |
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| <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> |
| <p class="apache">Apache HTTP Server Version 2.0</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 2.0</a> > <a href="./">Modules</a></div> |
| <div id="page-content"> |
| <div class="retired"><h4>Please note</h4> |
| <p>This document refers to the <strong>2.0</strong> version of Apache httpd, which <strong>is no longer maintained</strong>. Upgrade, and refer to the current version of httpd instead, documented at:</p> |
| <ul><li><a href="http://httpd.apache.org/docs/current/">Current release version of Apache HTTP Server documentation</a></li></ul><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="../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>Experimental</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> |
| |
| <div class="warning"> |
| This module is experimental. Documentation is still under development... |
| </div> |
| |
| <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_proxy.html">mod_proxy</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> |
| |
| <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> |
| <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="#cacheexpirycheck">CacheExpiryCheck</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachegcclean">CacheGcClean</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachegcdaily">CacheGcDaily</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachegcinterval">CacheGcInterval</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachegcmemusage">CacheGcMemUsage</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachegcunused">CacheGcUnused</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> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachesize">CacheSize</a></li> |
| <li><img alt="" src="../images/down.gif" /> <a href="#cachetimemargin">CacheTimeMargin</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>Experimental</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>Experimental</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="CacheExpiryCheck" id="CacheExpiryCheck">CacheExpiryCheck</a> <a name="cacheexpirycheck" id="cacheexpirycheck">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Indicates if the cache observes Expires dates when seeking |
| files</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheExpiryCheck On|Off</code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheExpiryCheck On</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheExpiryCheck Off<br /> |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheExpiryCheck</code> directive is currently |
| <em>not</em> implemented. |
| </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="CacheGcClean" id="CacheGcClean">CacheGcClean</a> <a name="cachegcclean" id="cachegcclean">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unchanged cached files that match a |
| URL</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcClean <var>hours</var> <var>url-string</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcClean ?</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheGcClean 12 /daily_scripts |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheGcClean</code> directive is currently |
| <em>not</em> implemented. |
| </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="CacheGcDaily" id="CacheGcDaily">CacheGcDaily</a> <a name="cachegcdaily" id="cachegcdaily">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The recurring time each day for garbage collection to be run. |
| (24 hour clock)</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcDaily <var>time</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcDaily ?</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheGcDaily 23:59 |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheGcDaily</code> directive is currently |
| <em>not</em> implemented. |
| </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="CacheGcInterval" id="CacheGcInterval">CacheGcInterval</a> <a name="cachegcinterval" id="cachegcinterval">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The interval between garbage collection attempts.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcInterval <var>hours</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>Experimental</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">CacheGcInterval</code> directive specifies the |
| number of hours to wait between attempts to free up disk space.</p> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheGcInterval 24<br /> |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheGcInterval</code> directive is currently |
| <em>not</em> implemented. |
| </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="CacheGcMemUsage" id="CacheGcMemUsage">CacheGcMemUsage</a> <a name="cachegcmemusage" id="cachegcmemusage">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum kilobytes of memory used for garbage |
| collection</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcMemUsage <var>KBytes</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcMemUsage ?</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheGcMemUsage 16 |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheGcMemUsage</code> directive is currently |
| <em>not</em> implemented. |
| </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="CacheGcUnused" id="CacheGcUnused">CacheGcUnused</a> <a name="cachegcunused" id="cachegcunused">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The time to retain unreferenced cached files that match a |
| URL.</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheGcUnused <var>hours</var> <var>url-string</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheGcUnused ?</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheGcUnused 12 /local_images |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheGcUnused</code> directive is currently |
| <em>not</em> implemented. |
| </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>Experimental</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>Experimental</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>Experimental</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 class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> |
| <div class="directive-section"><h2><a name="CacheSize" id="CacheSize">CacheSize</a> <a name="cachesize" id="cachesize">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum amount of disk space that will be used by the |
| cache in KBytes</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheSize <var>KBytes</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheSize 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>Experimental</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">CacheSize</code> directive sets the desired |
| disk space usage of the cache, in KBytes (1024-byte units). This |
| directive does not put a hard limit on the size of the cache. The |
| garbage collector will delete files until the usage is at or below the |
| settings. Always use a value that is lower than the available disk |
| space.</p> |
| |
| <div class="example"><p><code> |
| CacheSize 5000000 |
| </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="CacheTimeMargin" id="CacheTimeMargin">CacheTimeMargin</a> <a name="cachetimemargin" id="cachetimemargin">Directive</a></h2> |
| <table class="directive"> |
| <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum time margin to cache a document</td></tr> |
| <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheTimeMargin <var>?</var></code></td></tr> |
| <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheTimeMargin ?</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>Experimental</td></tr> |
| <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_disk_cache</td></tr> |
| </table> |
| <p>More detail will be added here, when the function is implemented.</p> |
| |
| <div class="example"><p><code> |
| CacheTimeMargin X |
| </code></p></div> |
| |
| <div class="warning"> |
| The <code class="directive">CacheTimeMargin</code> directive is currently |
| <em>not</em> implemented. |
| </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="../ko/mod/mod_disk_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> |
| </div><div id="footer"> |
| <p class="apache">Copyright 2013 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p> |
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