mirror of
https://github.com/apache/httpd.git
synced 2025-10-25 21:57:48 +03:00
321245634d
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93826 13f79535-47bb-0310-9956-ffa450edef68
73 lines
7.3 KiB
HTML
73 lines
7.3 KiB
HTML
<html xmlns="http://www.w3.org/TR/xhtml1/strict"><head><!--
|
|
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
|
|
This file is generated from xml source: DO NOT EDIT
|
|
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
|
|
--><title>perchild - Apache HTTP Server</title><link href="../style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img alt="[APACHE DOCUMENTATION]" src="../images/sub.gif"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache Module perchild</h1><table cellspacing="1" cellpadding="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td valign="top"><span class="help">Description:</span></td><td><description>Multi-Processing Module allowing for daemon processes
|
|
serving requests to be assigned a variety of different
|
|
userids</description></td></tr><tr><td><a href="module-dict.html#Status" class="help">Status:</a></td><td>MPM</td></tr><tr><td><a href="module-dict.html#ModuleIdentifier" class="help">Module Identifier:</a></td><td>mpm_perchild_module</td></tr></table></td></tr></table><h2>Summary</h2><summary>
|
|
<blockquote><table><tr><td bgcolor="#ffe5f5">
|
|
This MPM does not currently work on most platforms. Work is ongoing to
|
|
make it functional.
|
|
</td></tr></table></blockquote>
|
|
|
|
<p>This Multi-Processing Module (MPM) implements a hybrid
|
|
multi-process, multi-threaded web server. A fixed number of
|
|
processes create threads to handle requests. Fluctuations in
|
|
load are handled by increasing or decreasing the number of
|
|
threads in each process.</p>
|
|
|
|
<p>A single control process launches the number of child processes
|
|
indicated by the <a href="mpm_common.html#numservers" class="directive"><code class="directive">NumServers</code></a> directive at server
|
|
startup. Each child process creates threads as specified in the
|
|
<code>StartThreads</code> directive. The individual threads then
|
|
listen for connections and serve them when they arrive.</p>
|
|
|
|
<p>Apache always tries to maintain a pool of <em>spare</em> or
|
|
idle server threads, which stand ready to serve incoming
|
|
requests. In this way, clients do not need to wait for new
|
|
threads to be created. For each child process, Apache assesses
|
|
the number of idle threads and creates or destroys threads to
|
|
keep this number within the boundaries specified by
|
|
<code>MinSpareThreads</code> and <code>MaxSpareThreads</code>.
|
|
Since this process is very self-regulating, it is rarely
|
|
necessary to modify these directives from their default values.
|
|
The maximum number of clients that may be served simultaneously
|
|
is determined by multiplying the number of server processes
|
|
that will be created (<code>NumServers</code>) by the maximum
|
|
number of threads created in each process
|
|
(<code>MaxThreadsPerChild</code>).</p>
|
|
|
|
<p>While the parent process is usually started as root under
|
|
Unix in order to bind to port 80, the child processes and
|
|
threads are launched by Apache as a less-privileged user. The
|
|
<code>User</code> and <code>Group</code> directives are used to
|
|
set the privileges of the Apache child processes. The child
|
|
processes must be able to read all the content that will be
|
|
served, but should have as few privileges beyond that as
|
|
possible. In addition, unless <a href="../suexec.html">suexec</a> is used, these directives also
|
|
set the privileges which will be inherited by CGI scripts.</p>
|
|
|
|
<p><code>MaxRequestsPerChild</code> controls how frequently the
|
|
server recycles processes by killing old ones and launching new
|
|
ones.</p>
|
|
|
|
<p>See also: <a href="../bind.html">Setting which addresses and
|
|
ports Apache uses</a>.</p>
|
|
|
|
<p>In addition it adds the extra ability to specify that
|
|
specific processes should serve requests under different
|
|
userids. These processes can then be associated with specific
|
|
virtual hosts.</p>
|
|
|
|
</summary><h2>Directives</h2><ul><li><a href="#assignuserid">AssignUserId</a></li><li><a href="#childperuserid">ChildPerUserId</a></li><li><a href="mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></li><li><a href="mpm_common.html#group">Group</a></li><li><a href="mpm_common.html#listen">Listen</a></li><li><a href="mpm_common.html#listenbacklog">ListenBacklog</a></li><li><a href="mpm_common.html#lockfile">LockFile</a></li><li><a href="mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></li><li><a href="mpm_common.html#maxsparethreads">MaxSpareThreads</a></li><li><a href="mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></li><li><a href="mpm_common.html#minsparethreads">MinSpareThreads</a></li><li><a href="mpm_common.html#numservers">NumServers</a></li><li><a href="mpm_common.html#pidfile">PidFile</a></li><li><a href="mpm_common.html#scoreboardfile">ScoreBoardFile</a></li><li><a href="mpm_common.html#sendbuffersize">SendBufferSize</a></li><li><a href="mpm_common.html#startthreads">StartThreads</a></li><li><a href="mpm_common.html#user">User</a></li></ul><hr/><h2><a name="AssignUserId">AssignUserId</a> <a name="assignuserid">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td/></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td><syntax>AssignUserID <em>user_id</em> <em>group_id</em></syntax></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>virtual host</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>MPM</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>perchild</td></tr></table></td></tr></table><usage>
|
|
<p>Tie a virtual host to a specific child process. Requests addressed to
|
|
the virtual host where this directive appears will be served by the process
|
|
running with the specified user and group id.</p>
|
|
</usage><hr/><h2><a name="ChildPerUserId">ChildPerUserId</a> <a name="childperuserid">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td/></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td><syntax>ChildPerUserID <em>user_id</em>
|
|
<em>group_id</em> <em>child_id</em></syntax></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>MPM</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>perchild</td></tr></table></td></tr></table><usage>
|
|
<p>Specify a user id and group id for a specific child process. The number of
|
|
children if set by the <a href="mpm_common.html#numservers">NumServers</a>
|
|
directive. For example, the default value for <a href="mpm_common.html#numservers">NumServers</a> is 5 and that means
|
|
children ids 1,2,3,4 and 5 are available for assigment. If a child does not
|
|
have an associated ChildPerUserID, it inherits the <a href="mpm_common.html#user">User</a> and <a href="mpm_common.html#group">Group</a> settings from the main server </p>
|
|
</usage><hr/><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img alt="Index" src="../images/index.gif"/></a><a href="../"><img alt="Home" src="../images/home.gif"/></a></blockquote></body></html> |