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89 lines
8.6 KiB
Plaintext
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--><title>perchild - Apache HTTP Server</title><link href="../style/manual.css" type="text/css" rel="stylesheet"></head><body><blockquote><div align="center"><img src="../images/sub.gif" alt="[APACHE DOCUMENTATION]"><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 nowrap="nowrap" valign="top"><span class="help">Description:
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</span></td><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><td nowrap="nowrap"><a href="module-dict.html#Status" class="help">Status:
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</a></td><td>MPM</td></tr><tr><td nowrap="nowrap"><a href="module-dict.html#ModuleIdentifier" class="help">Module Identifier:
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</a></td><td>mpm_perchild_module</td></tr></table></td></tr></table><h2>Summary</h2>
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<blockquote><table><tr><td bgcolor="#ffe5f5">
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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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</td></tr></table></blockquote>
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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 <a href="../mod/mpm_common.html#numservers" class="directive"><code class="directive">NumServers</code></a> directive at server
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startup. Each child process creates threads as specified in the
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<a href="../mod/mpm_common.html#startthreads" class="directive"><code class="directive">StartThreads</code></a> 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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<a href="../mod/mpm_common.html#minsparethreads" class="directive"><code class="directive">MinSpareThreads</code></a>
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and <a href="../mod/mpm_common.html#maxsparethreads" class="directive"><code class="directive">MaxSpareThreads</code></a>.
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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 (<a href="../mod/mpm_common.html#numservers" class="directive"><code class="directive">NumServers</code></a>) by the maximum
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number of threads created in each process
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(<a href="../mod/mpm_common.html#maxthreadsperchild" class="directive"><code class="directive">MaxThreadsPerChild</code></a>).</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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<a href="../mod/mpm_common.html#user" class="directive"><code class="directive">User</code></a> and <a href="../mod/mpm_common.html#group" class="directive"><code class="directive">Group</code></a> 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><a href="../mod/mpm_common.html#maxrequestsperchild" class="directive"><code class="directive">MaxRequestsPerChild</code></a>
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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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<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 nowrap="nowrap"><strong>Description:
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</strong></td><td></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>AssignUserID <em>user_id</em> <em>group_id</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>virtual host</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>MPM</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>perchild</td></tr></table></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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<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 nowrap="nowrap"><strong>Description:
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</strong></td><td></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Syntax" class="help">Syntax:
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</a></td><td>ChildPerUserID <em>user_id</em>
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<em>group_id</em> <em>child_id</em></td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Context" class="help">Context:
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</a></td><td>server config</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Status" class="help">Status:
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</a></td><td>MPM</td></tr><tr><td nowrap="nowrap"><a href="directive-dict.html#Module" class="help">Module:
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</a></td><td>perchild</td></tr></table></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 <a href="../mod/mpm_common.html#numservers" class="directive"><code class="directive">NumServers</code></a>
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directive. For example, the default value for <a href="../mod/mpm_common.html#numservers" class="directive"><code class="directive">NumServers</code></a> 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 <a href="../mod/mpm_common.html#user" class="directive"><code class="directive">User</code></a> and <a href="../mod/mpm_common.html#group" class="directive"><code class="directive">Group</code></a> settings from the main server </p>
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<hr></blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="../images/index.gif" alt="Index"></a><a href="../"><img src="../images/home.gif" alt="Home"></a></body></html> |