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225 lines
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>htcacheclean - Clean up the disk cache - Apache HTTP Server</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" />
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<script src="../style/scripts/prettify.js" type="text/javascript">
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body id="manual-page"><div id="page-header">
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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>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.gif" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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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 2.5</a> > <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>htcacheclean - Clean up the disk cache</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/programs/htcacheclean.html" title="English"> en </a> |
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<a href="../ko/programs/htcacheclean.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="../tr/programs/htcacheclean.html" hreflang="tr" rel="alternate" title="T<>rk<72>e"> tr </a></p>
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</div>
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<p><code>htcacheclean</code> is used to keep the size of
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<code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code>'s storage within a given size limit, or
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limit on inodes in use. This tool can run either manually or in daemon mode.
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When running in daemon mode, it sleeps in the background and checks the cache
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directory at regular intervals for cached content to be removed. You can stop
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the daemon cleanly by sending it a TERM or INT signal. When run manually, a
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once off check of the cache directory is made for cached content to be
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removed. If one or more URLs are specified, each URL will be deleted from
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the cache, if present.</p>
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</div>
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<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#delete">Deleting a specific URL</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#list">Listing URLs in the Cache</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#exit">Exit Status</a></li>
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</ul><h3>See also</h3><ul class="seealso"><li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
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<p><code><strong>htcacheclean</strong>
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[ -<strong>D</strong> ]
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[ -<strong>v</strong> ]
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[ -<strong>t</strong> ]
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[ -<strong>r</strong> ]
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[ -<strong>n</strong> ]
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[ -<strong>R</strong><var>round</var> ]
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-<strong>p</strong><var>path</var>
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[-<strong>l</strong><var>limit</var>|
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-<strong>L</strong><var>limit</var>]</code></p>
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<p><code><strong>htcacheclean</strong>
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[ -<strong>n</strong> ]
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[ -<strong>t</strong> ]
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[ -<strong>i</strong> ]
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[ -<strong>P</strong><var>pidfile</var> ]
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[ -<strong>R</strong><var>round</var> ]
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-<strong>d</strong><var>interval</var>
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-<strong>p</strong><var>path</var>
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[-<strong>l</strong><var>limit</var>|
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-<strong>L</strong><var>limit</var>]</code></p>
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<p><code><strong>htcacheclean</strong>
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[ -<strong>v</strong> ]
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[ -<strong>R</strong><var>round</var> ]
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-<strong>p</strong><var>path</var>
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[ -<strong>a</strong> ]
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[ -<strong>A</strong> ]</code></p>
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<p><code><strong>htcacheclean</strong>
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[ -<strong>D</strong> ]
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[ -<strong>v</strong> ]
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[ -<strong>t</strong> ]
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[ -<strong>R</strong><var>round</var> ]
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-<strong>p</strong><var>path</var>
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<var>url</var></code></p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="options" id="options">Options</a></h2>
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<dl>
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<dt><code>-d<var>interval</var></code></dt>
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<dd>Daemonize and repeat cache cleaning every <var>interval</var> minutes.
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This option is mutually exclusive with the <code>-D</code>, <code>-v</code>
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and <code>-r</code> options. To shutdown the daemon cleanly, just send it
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a <code>SIGTERM</code> or <code>SIGINT</code>.</dd>
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<dt><code>-D</code></dt>
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<dd>Do a dry run and don't delete anything. This option is mutually
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exclusive with the <code>-d</code> option. When doing a dry run and
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deleting directories with <code>-t</code>, the inodes reported deleted
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in the stats cannot take into account the directories deleted, and will
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be marked as an estimate.</dd>
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<dt><code>-v</code></dt>
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<dd>Be verbose and print statistics. This option is mutually exclusive
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with the <code>-d</code> option.</dd>
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<dt><code>-r</code></dt>
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<dd>Clean thoroughly. This assumes that the Apache web server is
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not running (otherwise you may get garbage in the cache). This option
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is mutually exclusive with the <code>-d</code> option and implies
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the <code>-t</code> option.</dd>
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<dt><code>-n</code></dt>
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<dd>Be nice. This causes slower processing in favour of other
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processes. <code>htcacheclean</code> will sleep from time to time
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so that (a) the disk IO will be delayed and (b) the kernel can schedule
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other processes in the meantime.</dd>
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<dt><code>-t</code></dt>
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<dd>Delete all empty directories. By default only cache files are
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removed, however with some configurations the large number of
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directories created may require attention. If your configuration
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requires a very large number of directories, to the point that
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inode or file allocation table exhaustion may become an issue, use
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of this option is advised.</dd>
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<dt><code>-p<var>path</var></code></dt>
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<dd>Specify <var>path</var> as the root directory of the disk cache. This
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should be the same value as specified with the <code class="directive"><a href="../mod/mod_cache_disk.html#cacheroot">CacheRoot</a></code> directive.</dd>
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<dt><code>-P<var>pidfile</var></code></dt>
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<dd>Specify <var>pidfile</var> as the name of the file to write the
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process ID to when daemonized.</dd>
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<dt><code>-R<var>round</var></code></dt>
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<dd>Specify <var>round</var> as the amount to round sizes up to, to
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compensate for disk block sizes. Set to the block size of the cache
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partition.</dd>
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<dt><code>-l<var>limit</var></code></dt>
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<dd>Specify <var>limit</var> as the total disk cache size limit. The value
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is expressed in bytes by default (or attaching <code>B</code> to the
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number). Attach <code>K</code> for Kbytes or <code>M</code> for
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MBytes.</dd>
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<dt><code>-L<var>limit</var></code></dt>
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<dd>Specify <var>limit</var> as the total disk cache inode limit.</dd>
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<dt><code>-i</code></dt>
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<dd>Be intelligent and run only when there was a modification of the disk
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cache. This option is only possible together with the <code>-d</code>
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option.</dd>
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<dt><code>-a</code></dt>
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<dd>List the URLs currently stored in the cache. Variants of the same URL
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will be listed once for each variant.</dd>
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<dt><code>-A</code></dt>
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<dd>List the URLs currently stored in the cache, along with their
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attributes in the following order: url, header size, body size, status,
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entity version, date, expiry, request time, response time, body present,
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head request.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="delete" id="delete">Deleting a specific URL</a></h2>
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<p>If <code>htcacheclean</code> is passed one or more URLs, each URL will
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be deleted from the cache. If multiple variants of an URL exists, all
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variants would be deleted.</p>
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<p>When a reverse proxied URL is to be deleted, the effective URL is
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constructed from the <strong>Host</strong> header, the
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<strong>port</strong>, the <strong>path</strong> and the
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<strong>query</strong>. Note the '?' in the URL must always be specified
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explicitly, whether a query string is present or not. For example, an
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attempt to delete the path <strong>/</strong> from the server
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<strong>localhost</strong>, the URL to delete would be
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<strong>http://localhost:80/?</strong>.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="list" id="list">Listing URLs in the Cache</a></h2>
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<p>By passing the <code>-a</code> or <code>-A</code> options to
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<code>htcacheclean</code>, the URLs within the cache will be listed
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as they are found, one URL per line. The <code>-A</code> option
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dumps the full cache entry after the URL, with fields in the
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following order:</p>
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<dl>
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<dt>url</dt><dd>The URL of the entry.</dd>
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<dt>header size</dt><dd>The size of the header in bytes.</dd>
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<dt>body size</dt><dd>The size of the body in bytes.</dd>
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<dt>status</dt><dd>Status of the cached response.</dd>
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<dt>entity version</dt><dd>The number of times this entry has been
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revalidated without being deleted.</dd>
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<dt>date</dt><dd>Date of the response.</dd>
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<dt>expiry</dt><dd>Expiry date of the response.</dd>
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<dt>request time</dt><dd>Time of the start of the request.</dd>
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<dt>response time</dt><dd>Time of the end of the request.</dd>
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<dt>body present</dt><dd>If 0, no body is stored with this request,
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1 otherwise.</dd>
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<dt>head request</dt><dd>If 1, the entry contains a cached HEAD
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request with no body, 0 otherwise.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="exit" id="exit">Exit Status</a></h2>
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<p><code>htcacheclean</code> returns a zero status ("true") if all
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operations were successful, <code>1</code> otherwise. If an URL is
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specified, and the URL was cached and successfully removed,
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<code>0</code> is returned, <code>2</code> otherwise. If an error
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occurred during URL removal, <code>1</code> is returned.</p>
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</div></div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/programs/htcacheclean.html" title="English"> en </a> |
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<a href="../ko/programs/htcacheclean.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
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<a href="../tr/programs/htcacheclean.html" hreflang="tr" rel="alternate" title="T<>rk<72>e"> tr </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2012 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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<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></div><script type="text/javascript">
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