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94fc883415
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@99326 13f79535-47bb-0310-9956-ffa450edef68
330 lines
9.9 KiB
XML
330 lines
9.9 KiB
XML
<?xml version="1.0"?>
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<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
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<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<modulesynopsis metafile="mod_disk_cache.xml.meta">
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<name>mod_disk_cache</name>
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<description>Content cache storage manager keyed to URIs</description>
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<status>Experimental</status>
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<sourcefile>mod_disk_cache.c</sourcefile>
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<identifier>disk_cache_module</identifier>
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<summary>
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<note type="warning">
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This module is experimental. Documentation is still under development...
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</note>
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<p><module>mod_disk_cache</module> implements a disk based storage
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manager. It is primarily of use in conjunction with
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<module>mod_proxy</module>.</p>
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<p>Content is stored in and retrieved from the cache using URI based
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keys. Content with access protection is not cached.</p>
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<note><title>Note:</title>
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<p><module>mod_disk_cache</module> requires the services of
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<module>mod_cache</module>.</p>
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</note>
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</summary>
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<directivesynopsis>
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<name>CacheRoot</name>
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<description>The directory root under which cache files are
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stored</description>
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<syntax>CacheRoot <var>directory</var></syntax>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheRoot</directive> directive defines the name of
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the directory on the disk to contain cache files. If the <module
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>mod_disk_cache</module> module has been loaded or compiled in to the
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Apache server, this directive <em>must</em> be defined. Failing to
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provide a value for <directive>CacheRoot</directive> will result in
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a configuration file processing error. The <directive
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module="mod_disk_cache">CacheDirLevels</directive> and <directive
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module="mod_disk_cache">CacheDirLength</directive> directives define
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the structure of the directories under the specified root directory.</p>
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<example>
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CacheRoot c:/cacheroot
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheSize</name>
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<description>The maximum amount of disk space that will be used by the
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cache in KBytes</description>
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<syntax>CacheSize <var>KBytes</var></syntax>
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<default>CacheSize 1000000</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheSize</directive> directive sets the desired
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disk space usage of the cache, in KBytes (1024-byte units). This
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directive does not put a hard limit on the size of the cache. The
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garbage collector will delete files until the usage is at or below the
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settings. Always use a value that is lower than the available disk
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space.</p>
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<example>
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CacheSize 5000000
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheGcInterval</name>
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<description>The interval between garbage collection attempts.</description>
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<syntax>CacheGcInterval <var>hours</var></syntax>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheGcInterval</directive> directive specifies the
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number of hours to wait between attempts to free up disk space.</p>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheGcInterval 24<br />
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</example>
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<note type="warning">
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The <directive>CacheGcInterval</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheDirLevels</name>
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<description>The number of levels of subdirectories in the
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cache.</description>
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<syntax>CacheDirLevels <var>levels</var></syntax>
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<default>CacheDirLevels 3</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheDirLevels</directive> directive sets the number
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of subdirectory levels in the cache. Cached data will be saved this
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many directory levels below the <directive module="mod_disk_cache"
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>CacheRoot</directive> directory.</p>
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<note>
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<p>The result of <directive>CacheDirLevels</directive>*
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<directive module="mod_disk_cache">CacheDirLength</directive> must
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not be higher than 20.</p>
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</note>
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<example>
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CacheDirLevels 5
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheDirLength</name>
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<description>The number of characters in subdirectory names</description>
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<syntax>CacheDirLength <var>length</var></syntax>
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<default>CacheDirLength 2</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheDirLength</directive> directive sets the number
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of characters for each subdirectory name in the cache hierarchy.</p>
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<note>
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<p>The result of <directive module="mod_disk_cache"
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>CacheDirLevels</directive>* <directive>CacheDirLength</directive>
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must not be higher than 20.</p>
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</note>
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<example>
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CacheDirLength 4
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheExpiryCheck</name>
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<description>Indicates if the cache observes Expires dates when seeking
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files</description>
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<syntax>CacheExpiryCheck On|Off</syntax>
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<default>CacheExpiryCheck On</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheExpiryCheck Off<br />
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</example>
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<note type="warning">
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The <directive>CacheExpiryCheck</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheMinFileSize</name>
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<description>The minimum size (in bytes) of a document to be placed in the
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cache</description>
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<syntax>CacheMinFileSize <var>bytes</var></syntax>
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<default>CacheMinFileSize 1</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheMinFileSize</directive> directive sets the
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minimum size, in bytes, for a document to be considered for storage
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in the cache.</p>
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<example>
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CacheMinFileSize 64
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheMaxFileSize</name>
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<description>The maximum size (in bytes) of a document to be placed in the
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cache</description>
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<syntax>CacheMaxFileSize <var>bytes</var></syntax>
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<default>CacheMaxFileSize 1000000</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>The <directive>CacheMaxFileSize</directive> directive sets the
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maximum size, in bytes, for a document to be considered for storage in
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the cache.</p>
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<example>
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CacheMaxFileSize 64000
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</example>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheTimeMargin</name>
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<description>The minimum time margin to cache a document</description>
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<syntax>CacheTimeMargin <var>?</var></syntax>
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<default>CacheTimeMargin ?</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheTimeMargin X
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</example>
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<note type="warning">
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The <directive>CacheTimeMargin</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheGcDaily</name>
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<description>The recurring time each day for garbage collection to be run.
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(24 hour clock)</description>
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<syntax>CacheGcDaily <var>time</var></syntax>
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<default>CacheGcDaily ?</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheGcDaily 23:59
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</example>
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<note type="warning">
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The <directive>CacheGcDaily</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheGcUnused</name>
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<description>The time to retain unreferenced cached files that match a
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URL.</description>
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<syntax>CacheGcUnused <var>hours</var> <var>url-string</var></syntax>
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<default>CacheGcUnused ?</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheGcUnused 12 /local_images
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</example>
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<note type="warning">
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The <directive>CacheGcUnused</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheGcClean</name>
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<description>The time to retain unchanged cached files that match a
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URL</description>
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<syntax>CacheGcClean <var>hours</var> <var>url-string</var></syntax>
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<default>CacheGcClean ?</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheGcClean 12 /daily_scripts
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</example>
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<note type="warning">
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The <directive>CacheGcClean</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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<directivesynopsis>
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<name>CacheGcMemUsage</name>
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<description>The maximum kilobytes of memory used for garbage
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collection</description>
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<syntax>CacheGcMemUsage <var>KBytes</var></syntax>
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<default>CacheGcMemUsage ?</default>
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<contextlist><context>server config</context><context>virtual host</context>
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</contextlist>
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<usage>
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<p>More detail will be added here, when the function is implemented.</p>
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<example>
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CacheGcMemUsage 16
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</example>
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<note type="warning">
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The <directive>CacheGcMemUsage</directive> directive is currently
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<em>not</em> implemented.
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</note>
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</usage>
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</directivesynopsis>
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</modulesynopsis>
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