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authorhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 03:10:21 -0500
committerhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 03:10:21 -0500
commitc0b7206652b2852bc574694e7ba07ba1c2acdc00 (patch)
tree5cb95cb0e19e03610525903df46279df2c3b7eb1 /rubbos/app/apache2/manual/mod/perchild.html.en
parentb6d3d6e668b793220f2d3af1bc3e828553dc3fe6 (diff)
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Change-Id: Id4c572809969ebe89e946e88063eaed262cff3f2 Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
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@@ -1,266 +0,0 @@
-<?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>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="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
-<div id="path">
-<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div>
-<div id="page-content">
-<div id="preamble"><h1>Apache MPM perchild</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/perchild.html" title="English">&nbsp;en&nbsp;</a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Multi-Processing Module allowing for daemon processes serving
-requests to be assigned a variety of different userids</td></tr>
-<tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr>
-<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>mpm_perchild_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>perchild.c</td></tr></table>
-<h3>Summary</h3>
-
- <div class="warning">
- This module is not functional. Development of this module is not
- complete and is not currently active. Do not use
- <code class="module"><a href="../mod/perchild.html">perchild</a></code> unless you are a programmer willing to
- help fix it.
- </div>
-
- <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>
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#acceptmutex">AcceptMutex</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#assignuserid">AssignUserID</a></li>
-<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#bs2000account">BS2000Account</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#enableexceptionhook">EnableExceptionHook</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/down.gif" /> <a href="#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/down.gif" /> <a href="#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#receivebuffersize">ReceiveBufferSize</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#serverlimit">ServerLimit</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#threadlimit">ThreadLimit</a></li>
-<li><img alt="" src="../images/right.gif" /> <a href="mpm_common.html#user">User</a></li>
-</ul>
-<h3>Topics</h3>
-<ul id="topics">
-<li><img alt="" src="../images/down.gif" /> <a href="#how-it-works">How it works</a></li>
-</ul><h3>See also</h3>
-<ul class="seealso">
-<li><a href="../bind.html">Setting which addresses and ports Apache
-uses</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="how-it-works" id="how-it-works">How it works</a></h2>
- <p>A single control process launches the number of child processes
- indicated by the <code class="directive"><a href="#numservers">NumServers</a></code>
- directive at server startup. Each child process creates threads as
- specified in the <code class="directive"><a href="../mod/mpm_common.html#startthreads">StartThreads</a></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 <dfn>spare</dfn> 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 class="directive"><a href="../mod/mpm_common.html#minsparethreads">MinSpareThreads</a></code>
- and <code class="directive"><a href="../mod/mpm_common.html#maxsparethreads">MaxSpareThreads</a></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 class="directive"><a href="#numservers">NumServers</a></code>) by the maximum
- number of threads created in each process
- (<code class="directive"><a href="../mod/mpm_common.html#maxthreadsperchild">MaxThreadsPerChild</a></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 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
- 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 <code class="program"><a href="../programs/suexec.html">suexec</a></code> is used,
- these directives also set the privileges which will be inherited
- by CGI scripts.</p>
-
- <p><code class="directive"><a href="../mod/mpm_common.html#maxrequestsperchild">MaxRequestsPerChild</a></code>
- controls how frequently the
- server recycles processes by killing old ones and launching new
- ones.</p>
-
- <h3><a name="user-ids" id="user-ids">Working with different user-IDs</a></h3>
- <p>The <code class="module"><a href="../mod/perchild.html">perchild</a></code> MPM adds the extra ability to
- specify that particular processes should serve requests under
- different user-IDs. These user-IDs can then be associated with
- specific virtual hosts. You have to use one <code class="directive"><a href="#childperuserid">ChildPerUserID</a></code> directive for
- every user/group combination you want to be run. Then you can tie
- particular virtual hosts to that user and group IDs.</p>
-
- <p>The following example runs 7 child processes. Two of them are run
- under <code>user1</code>/<code>group1</code>. The next four are run
- under <code>user2</code>/<code>group2</code> and the remaining
- process uses 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>
- of the main server:</p>
-
- <div class="example"><h3>Global config</h3><p><code>
- NumServers 7<br />
- ChildPerUserID user1 group1 2<br />
- ChildPerUserID user2 group2 4
- </code></p></div>
-
- <p>Using unbalanced numbers of processes as above is useful, if the
- particular virtual hosts produce different load. The assignment to
- the virtual hosts is easily done as in the example below. In
- conclusion with the example above the following assumes, that
- <code>server2</code> has to serve about twice of the hits of
- <code>server1</code>.</p>
-
- <div class="example"><h3>Example</h3><p><code>
- NameVirtualHost *<br />
- <br />
- &lt;VirtualHost *&gt;<br />
- <span class="indent">
- ServerName fallbackhost<br />
- # no assignment; use fallback<br />
- </span>
- &lt;/VirtualHost&gt;<br />
- <br />
- &lt;VirtualHost *&gt;<br />
- <span class="indent">
- ServerName server1<br />
- AssignUserID user1 group1<br />
- </span>
- &lt;/VirtualHost&gt;<br />
- <br />
- &lt;VirtualHost *&gt;<br />
- <span class="indent">
- ServerName server2<br />
- AssignUserID user2 group2<br />
- </span>
- &lt;/VirtualHost&gt;
- </code></p></div>
-
-</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:</a></th><td>Tie a virtual host to a user and group ID</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AssignUserID <var>user-id</var> <var>group-id</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>virtual host</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
-</table>
- <p>Tie a virtual host to a specific user/group combination. Requests
- addressed to the virtual host where this directive appears will be
- served by a process running with the specified user and group ID.</p>
-
- <p>The user and group ID has to be assigned to a number of children
- in the global server config using the <code class="directive"><a href="#childperuserid">ChildPerUserID</a></code> directive. See the section above for a
- <a href="#user-ids">configuration example</a>.</p>
-
-</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:</a></th><td>Specify user ID and group ID for a number of child
-processes</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ChildPerUserID <var>user-id</var> <var>group-id</var>
-<var>num-children</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
-</table>
- <p>Specify a user ID and group ID for a number of child processes.
- The third argument, <var>num-children</var>, is the number of child
- processes to start with the specified user and group. It does
- <em>not</em> represent a specific child number. In order to use this
- directive, the server must be run initially as <code>root</code>.
- If you start the server as a non-root user, it will fail to change
- to the lesser privileged user.</p>
-
- <p>If the total number of child processes, found by totaling all of the
- third arguments to all <code class="directive">ChildPerUserID</code> directives
- in the config file, is less than <code class="directive"><a href="#numservers">NumServers</a></code>, then all remaining children will inherit 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.
- See the section above for a <a href="#user-ids">configuration
- example</a>.</p>
-
- <div class="warning"><h3>Security</h3>
- <p>Don't set <var>user-id</var> (or <var>group-id</var>) to
- <code>root</code> unless you know exactly what you are doing, and
- what the dangers are.</p>
- </div>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="MaxThreadsPerChild" id="MaxThreadsPerChild">MaxThreadsPerChild</a> <a name="maxthreadsperchild" id="maxthreadsperchild">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of threads per child process</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxThreadsPerChild <var>number</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MaxThreadsPerChild 64</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
-</table>
- <p>This directive sets the maximum number of threads that will be
- created in each child process. To increase this value beyond its
- default, it is necessary to change the value of the <code class="directive"><a href="../mod/mpm_common.html#threadlimit">ThreadLimit</a></code> directive and stop and
- re-start the server.</p>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="NumServers" id="NumServers">NumServers</a> <a name="numservers" id="numservers">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Total number of children alive at the same time</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>NumServers <var>number</var></code></td></tr>
-<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>NumServers 2</code></td></tr>
-<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config</td></tr>
-<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>MPM</td></tr>
-<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>perchild</td></tr>
-</table>
- <p>The <code class="directive">NumServers</code> directive determines the number
- of children alive at the same time. This number should be large enough to
- handle the requests for the entire site. To increase this value beyond the
- value of <code>8</code>, it is necessary to change the value of the
- <code class="directive"><a href="../mod/mpm_common.html#serverlimit">ServerLimit</a></code> directive and stop
- and re-start the server. See the section above for a <a href="#user-ids">configuration example</a>.</p>
-
-</div>
-</div>
-<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/perchild.html" title="English">&nbsp;en&nbsp;</a></p>
-</div><div id="footer">
-<p class="apache">Copyright 2009 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>
-<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> \ No newline at end of file