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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --><title>mod_ldap - Apache HTTP Server</title><link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="../images/favicon.ico" rel="shortcut icon" /></head><body><div id="page-header"><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><img alt="" src="../images/feather.gif" /></div><div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div><div id="path"><a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_ldap</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/mod/mod_ldap.html" title="English"> en </a></p></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>LDAP connection pooling and result caching services for useby other LDAP modules</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營dentifier:</a></th><td>ldap_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source燜ile:</a></th><td>util_ldap.c</td></tr><tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.0.41 and later</td></tr></table><h3>Summary</h3> <p>This module was created to improve the performance of websites relying on backend connections to LDAP servers. In addition to the functions provided by the standard LDAP libraries, this module adds an LDAP connection pool and an LDAP shared memory cache.</p> <p>To enable this module, LDAP support must be compiled into apr-util. This is achieved by adding the <code>--with-ldap</code> flag to the <code class="program"><a href="../programs/configure.html">configure</a></code> script when building Apache.</p> <p>SSL support requires that <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> be linked with one of the following LDAP SDKs: <a href="http://www.openldap.org/"> OpenLDAP SDK</a> (both 1.x and 2.x), <a href="http://developer.novell.com/ndk/cldap.htm"> Novell LDAP SDK</a> or the <a href="http://www.iplanet.com/downloads/developer/"> iPlanet(Netscape)</a> SDK.</p></div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#ldapcacheentries">LDAPCacheEntries</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapcachettl">LDAPCacheTTL</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapconnectiontimeout">LDAPConnectionTimeout</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapopcacheentries">LDAPOpCacheEntries</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapopcachettl">LDAPOpCacheTTL</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapsharedcachefile">LDAPSharedCacheFile</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldapsharedcachesize">LDAPSharedCacheSize</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldaptrustedca">LDAPTrustedCA</a></li><li><img alt="" src="../images/down.gif" /> <a href="#ldaptrustedcatype">LDAPTrustedCAType</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#exampleconfig">Example Configuration</a></li><li><img alt="" src="../images/down.gif" /> <a href="#pool">LDAP Connection Pool</a></li><li><img alt="" src="../images/down.gif" /> <a href="#cache">LDAP Cache</a></li><li><img alt="" src="../images/down.gif" /> <a href="#usingssltls">Using SSL</a></li></ul></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="exampleconfig" id="exampleconfig">Example Configuration</a></h2> <p>The following is an example configuration that uses <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> to increase the performance of HTTP Basic authentication provided by <code class="module"><a href="../mod/mod_auth_ldap.html">mod_auth_ldap</a></code>.</p> <div class="example"><p><code> # Enable the LDAP connection pool and shared<br /> # memory cache. Enable the LDAP cache status<br /> # handler. Requires that mod_ldap and mod_auth_ldap<br /> # be loaded. Change the "yourdomain.example.com" to<br /> # match your domain.<br /> <br /> LDAPSharedCacheSize 200000<br /> LDAPCacheEntries 1024<br /> LDAPCacheTTL 600<br /> LDAPOpCacheEntries 1024<br /> LDAPOpCacheTTL 600<br /> <br /> <Location /ldap-status><br /> <span class="indent"> SetHandler ldap-status<br /> Order deny,allow<br /> Deny from all<br /> Allow from yourdomain.example.com<br /> AuthLDAPEnabled on<br /> AuthLDAPURL ldap://127.0.0.1/dc=example,dc=com?uid?one<br /> AuthLDAPAuthoritative on<br /> require valid-user<br /> </span> </Location> </code></p></div></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="pool" id="pool">LDAP Connection Pool</a></h2> <p>LDAP connections are pooled from request to request. This allows the LDAP server to remain connected and bound ready for the next request, without the need to unbind/connect/rebind. The performance advantages are similar to the effect of HTTP keepalives.</p> <p>On a busy server it is possible that many requests will try and access the same LDAP server connection simultaneously. Where an LDAP connection is in use, Apache will create a new connection alongside the original one. This ensures that the connection pool does not become a bottleneck.</p> <p>There is no need to manually enable connection pooling in the Apache configuration. Any module using this module for access to LDAP services will share the connection pool.</p></div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="section"><h2><a name="cache" id="cache">LDAP Cache</a></h2> <p>For improved performance, <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> uses an aggressive caching strategy to minimize the number of times that the LDAP server must be contacted. Caching can easily double or triple the throughput of Apache when it is serving pages protected with mod_auth_ldap. In addition, the load on the LDAP server will be significantly decreased.</p> <p><code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> supports two types of LDAP caching during the search/bind phase with a <em>search/bind cache</em> and during the compare phase with two <em>operation caches</em>. Each LDAP URL that is used by the server has its own set of these three caches.</p> <h3><a name="search-bind" id="search-bind">The Search/Bind Cache</a></h3> <p>The process of doing a search and then a bind is the most time-consuming aspect of LDAP operation, especially if the directory is large. The search/bind cache is used to cache all searches that resulted in successful binds. Negative results (<em>i.e.</em>, unsuccessful searches, or searches that did not result in a successful bind) are not cached. The rationale behind this decision is that connections with invalid credentials are only a tiny percentage of the total number of connections, so by not caching invalid credentials, the size of the cache is reduced.</p> <p><code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> stores the username, the DN retrieved, the password used to bind, and the time of the bind in the cache. Whenever a new connection is initiated with the same username, <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> compares the password of the new connection with the password in the cache. If the passwords match, and if the cached entry is not too old, <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> bypasses the search/bind phase.</p> <p>The search and bind cache is controlled with the <code class="directive"><a href="#ldapcacheentries">LDAPCacheEntries</a></code> and <code class="directive"><a href="#ldapcachettl">LDAPCacheTTL</a></code> directives.</p> <h3><a name="opcaches" id="opcaches">Operation Caches</a></h3> <p>During attribute and distinguished name comparison functions, <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> uses two operation caches to cache the compare operations. The first compare cache is used to cache the results of compares done to test for LDAP group membership. The second compare cache is used to cache the results of comparisons done between distinguished names.</p> <p>The behavior of both of these caches is controlled with the <code class="directive"><a href="#ldapopcacheentries">LDAPOpCacheEntries</a></code> and <code class="directive"><a href="#ldapopcachettl">LDAPOpCacheTTL</a></code> directives.</p> <h3><a name="monitoring" id="monitoring">Monitoring the Cache</a></h3> <p><code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> has a content handler that allows administrators to monitor the cache performance. The name of the content handler is <code>ldap-status</code>, so the following directives could be used to access the <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> cache information:</p> <div class="example"><p><code> <Location /server/cache-info><br /> <span class="indent"> SetHandler ldap-status<br /> </span> </Location> </code></p></div> <p>By fetching the URL <code>http://servername/cache-info</code>, the administrator can get a status report of every cache that is used by <code class="module"><a href="../mod/mod_ldap.html">mod_ldap</a></code> cache. Note that if Apache does not⌨️ 快捷键说明
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