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92 lines
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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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--><title>perchild - 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 perchild</h1><table class="module"><tr><th><a href="module-dict.html#Description">Description:
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</a></th><td>Multi-Processing Module allowing for daemon processes
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serving requests to be assigned a variety of different
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userids</td></tr><tr><th><a href="module-dict.html#Status">Status:
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</a></th><td>MPM</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module<EFBFBD>Identifier:
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</a></th><td>mpm_perchild_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:
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</a></th><td>perchild.c</td></tr></table><h3>Summary</h3>
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<div class="warning">
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This MPM does not currently work on most platforms. Work is ongoing to
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make it functional.
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</div>
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<p>This Multi-Processing Module (MPM) implements a hybrid
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multi-process, multi-threaded web server. A fixed number of
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processes create threads to handle requests. Fluctuations in
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load are handled by increasing or decreasing the number of
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threads in each process.</p>
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<p>A single control process launches the number of child processes
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indicated by the <code class="directive"><a href="../mod/mpm_common.html#numservers">NumServers</a></code> directive at server
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startup. Each child process creates threads as specified in the
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<code class="directive"><a href="../mod/mpm_common.html#startthreads">StartThreads</a></code> directive.
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The individual threads then
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listen for connections and serve them when they arrive.</p>
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<p>Apache always tries to maintain a pool of <em>spare</em> or
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idle server threads, which stand ready to serve incoming
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requests. In this way, clients do not need to wait for new
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threads to be created. For each child process, Apache assesses
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the number of idle threads and creates or destroys threads to
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keep this number within the boundaries specified by
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<code class="directive"><a href="../mod/mpm_common.html#minsparethreads">MinSpareThreads</a></code>
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and <code class="directive"><a href="../mod/mpm_common.html#maxsparethreads">MaxSpareThreads</a></code>.
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Since this process is very self-regulating, it is rarely
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necessary to modify these directives from their default values.
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The maximum number of clients that may be served simultaneously
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is determined by multiplying the number of server processes
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that will be created (<code class="directive"><a href="../mod/mpm_common.html#numservers">NumServers</a></code>) by the maximum
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number of threads created in each process
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(<code class="directive"><a href="../mod/mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></code>).</p>
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<p>While the parent process is usually started as root under
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Unix in order to bind to port 80, the child processes and
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threads are launched by Apache as a less-privileged user. The
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<code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> directives are used to
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set the privileges of the Apache child processes. The child
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processes must be able to read all the content that will be
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served, but should have as few privileges beyond that as
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possible. In addition, unless <a href="../suexec.html">suexec</a> is used, these directives also
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set the privileges which will be inherited by CGI scripts.</p>
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<p><code class="directive"><a href="../mod/mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></code>
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controls how frequently the
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server recycles processes by killing old ones and launching new
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ones.</p>
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<p>See also: <a href="../bind.html">Setting which addresses and
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ports Apache uses</a>.</p>
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<p>In addition it adds the extra ability to specify that
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specific processes should serve requests under different
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userids. These processes can then be associated with specific
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virtual hosts.</p>
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</div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#assignuserid">AssignUserId</a></li><li><img alt="" src="../images/down.gif" /> <a href="#childperuserid">ChildPerUserId</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#group">Group</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listen">Listen</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#listenbacklog">ListenBacklog</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#lockfile">LockFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#numservers">NumServers</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#pidfile">PidFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#startthreads">StartThreads</a></li><li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#user">User</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="AssignUserId" id="AssignUserId">AssignUserId</a> <a name="assignuserid" id="assignuserid">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td /></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td>AssignUserID <em>user_id</em> <em>group_id</em></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>virtual host</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>MPM</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>perchild</td></tr></table>
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<p>Tie a virtual host to a specific child process. Requests addressed to
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the virtual host where this directive appears will be served by the process
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running with the specified user and group id.</p>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div><div class="directive-section"><h2><a name="ChildPerUserId" id="ChildPerUserId">ChildPerUserId</a> <a name="childperuserid" id="childperuserid">Directive</a></h2><table class="directive"><tr><th><a href="directive-dict.html#Description">Description:
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</a></th><td /></tr><tr><th><a href="directive-dict.html#Syntax">Syntax:
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</a></th><td>ChildPerUserID <em>user_id</em>
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<em>group_id</em> <em>child_id</em></td></tr><tr><th><a href="directive-dict.html#Context">Context:
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</a></th><td>server config</td></tr><tr><th><a href="directive-dict.html#Status">Status:
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</a></th><td>MPM</td></tr><tr><th><a href="directive-dict.html#Module">Module:
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</a></th><td>perchild</td></tr></table>
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<p>Specify a user id and group id for a specific child process. The number of
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children is set by the <code class="directive"><a href="../mod/mpm_common.html#numservers">NumServers</a></code>
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directive. For example, the default value for <code class="directive"><a href="../mod/mpm_common.html#numservers">NumServers</a></code> is 5 and that means
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children ids 1,2,3,4 and 5 are available for assigment. If a child does not
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have an associated ChildPerUserID, it inherits the <code class="directive"><a href="../mod/mpm_common.html#user">User</a></code> and <code class="directive"><a href="../mod/mpm_common.html#group">Group</a></code> settings from the main server </p>
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</div></div><div id="footer"><p class="apache">Maintained by the <a href="http://httpd.apache.org/docs-project/">Apache HTTP Server Documentation Project</a></p><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></body></html> |