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diff --git a/rubbos/app/httpd-2.0.64/docs/manual/mod/mpm_common.html.en b/rubbos/app/httpd-2.0.64/docs/manual/mod/mpm_common.html.en deleted file mode 100644 index 5b3bbc48..00000000 --- a/rubbos/app/httpd-2.0.64/docs/manual/mod/mpm_common.html.en +++ /dev/null @@ -1,896 +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>mpm_common - 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/">Documentation</a> > <a href="../">Version 2.0</a> > <a href="./">Modules</a></div> -<div id="page-content"> -<div id="preamble"><h1>Apache MPM Common Directives</h1> -<div class="toplang"> -<p><span>Available Languages: </span><a href="../de/mod/mpm_common.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | -<a href="../en/mod/mpm_common.html" title="English"> en </a> | -<a href="../es/mod/mpm_common.html" hreflang="es" rel="alternate" title="Español"> es </a> | -<a href="../ja/mod/mpm_common.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | -<a href="../tr/mod/mpm_common.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p> -</div> -<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>A collection of directives that are implemented by -more than one multi-processing module (MPM)</td></tr> -<tr><th><a href="module-dict.html#Status">Status:</a></th><td>MPM</td></tr></table> -</div> -<div id="quickview"><h3 class="directives">Directives</h3> -<ul id="toc"> -<li><img alt="" src="../images/down.gif" /> <a href="#acceptmutex">AcceptMutex</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#bs2000account">BS2000Account</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#coredumpdirectory">CoreDumpDirectory</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#enableexceptionhook">EnableExceptionHook</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#group">Group</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#listen">Listen</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#listenbacklog">ListenBackLog</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#lockfile">LockFile</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#maxclients">MaxClients</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#maxmemfree">MaxMemFree</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#maxrequestsperchild">MaxRequestsPerChild</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#maxsparethreads">MaxSpareThreads</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#minsparethreads">MinSpareThreads</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#pidfile">PidFile</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#receivebuffersize">ReceiveBufferSize</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#scoreboardfile">ScoreBoardFile</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#sendbuffersize">SendBufferSize</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#serverlimit">ServerLimit</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#startservers">StartServers</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#startthreads">StartThreads</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#threadlimit">ThreadLimit</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#threadsperchild">ThreadsPerChild</a></li> -<li><img alt="" src="../images/down.gif" /> <a href="#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="AcceptMutex" id="AcceptMutex">AcceptMutex</a> <a name="acceptmutex" id="acceptmutex">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Method that Apache uses to serialize multiple children -accepting requests on network sockets</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AcceptMutex Default|<var>method</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>AcceptMutex Default</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">AcceptMutex</code> directives sets the - method that Apache uses to serialize multiple children accepting - requests on network sockets. Prior to Apache 2.0, the method was - selectable only at compile time. The optimal method to use is - highly architecture and platform dependent. For further details, - see the <a href="../misc/perf-tuning.html">performance tuning</a> - documentation.</p> - - <p>If this directive is set to <code>Default</code>, then the - compile-time selected default will be used. Other possible - methods are listed below. Note that not all methods are - available on all platforms. If a method is specified which is - not available, a message will be written to the error log - listing the available methods.</p> - - <dl> - <dt><code>flock</code></dt> - <dd>uses the <code>flock(2)</code> system call to lock the - file defined by the <code class="directive"><a href="#lockfile">LockFile</a></code> directive.</dd> - - <dt><code>fcntl</code></dt> - <dd>uses the <code>fcntl(2)</code> system call to lock the - file defined by the <code class="directive"><a href="#lockfile">LockFile</a></code> directive.</dd> - - <dt><code>posixsem</code></dt> - <dd>uses POSIX compatible semaphores to implement the mutex.</dd> - - <dt><code>pthread</code></dt> - <dd>uses POSIX mutexes as implemented by the POSIX Threads - (PThreads) specification.</dd> - - <dt><code>sysvsem</code></dt> - <dd>uses SySV-style semaphores to implement the mutex.</dd> - </dl> - - <p>If you want to find out the compile time chosen default - for your system, you may set your <code class="directive"><a href="../mod/core.html#loglevel">LogLevel</a></code> to <code>debug</code>. Then the default <code class="directive">AcceptMutex</code> will be written into the <code class="directive"><a href="../mod/core.html#errorlog">ErrorLog</a></code>.</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="BS2000Account" id="BS2000Account">BS2000Account</a> <a name="bs2000account" id="bs2000account">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Define the non-privileged account on BS2000 -machines</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>BS2000Account <var>account</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><code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Only available for BS2000 machines</td></tr> -</table> - <p>The <code class="directive">BS2000Account</code> directive is available for - BS2000 hosts only. It must be used to define the account number for - the non-privileged apache server user (which was configured using the - <code class="directive"><a href="#user">User</a></code> directive). This is - required by the BS2000 POSIX subsystem (to change the underlying BS2000 - task environment by performing a sub-LOGON) to prevent CGI scripts - from accessing resources of the privileged account which started the - server, usually <code>SYSROOT</code>.</p> - - <div class="note"><h3>Note</h3> - <p>Only one <code>BS2000Account</code> directive can be used.</p> - </div> - -<h3>See also</h3> -<ul> -<li><a href="../platform/ebcdic.html">Apache EBCDIC port</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="CoreDumpDirectory" id="CoreDumpDirectory">CoreDumpDirectory</a> <a name="coredumpdirectory" id="coredumpdirectory">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Directory where Apache attempts to -switch before dumping core</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CoreDumpDirectory <var>directory</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for the default setting</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>This controls the directory to which Apache attempts to - switch before dumping core. The default is in the - <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code> directory, however - since this should not be writable by the user the server runs - as, core dumps won't normally get written. If you want a core - dump for debugging, you can use this directive to place it in a - different location.</p> - - <div class="note"><h3>Core Dumps on Linux</h3> - <p>If Apache starts as root and switches to another user, the - Linux kernel <em>disables</em> core dumps even if the directory is - writable for the process. Apache (2.0.46 and later) reenables core dumps - on Linux 2.4 and beyond, but only if you explicitly configure a <code class="directive">CoreDumpDirectory</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="EnableExceptionHook" id="EnableExceptionHook">EnableExceptionHook</a> <a name="enableexceptionhook" id="enableexceptionhook">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables a hook that runs exception handlers -after a crash</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>EnableExceptionHook On|Off</code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>EnableExceptionHook Off</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.0.49 and later</td></tr> -</table> - <p>For safety reasons this directive is only available if the server was - configured with the <code>--enable-exception-hook</code> option. It - enables a hook that allows external modules to plug in and do something - after a child crashed.</p> - - <p>There are already two modules, <code>mod_whatkilledus</code> and - <code>mod_backtrace</code> that make use of this hook. Please have a - look at Jeff Trawick's <a href="http://www.apache.org/~trawick/exception_hook.html">EnableExceptionHook site</a> for more information about these.</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="Group" id="Group">Group</a> <a name="group" id="group">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Group under which the server will answer -requests</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Group <var>unix-group</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>Group #-1</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Only valid in global server config since Apache -2.0</td></tr> -</table> - <p>The <code class="directive">Group</code> directive sets the group under - which the server will answer requests. 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 - specified group, and will instead continue to run as the group of the - original user. <var>Unix-group</var> is one of:</p> - - <dl> - <dt>A group name</dt> - <dd>Refers to the given group by name.</dd> - - <dt><code>#</code> followed by a group number.</dt> - <dd>Refers to a group by its number.</dd> - </dl> - - <div class="example"><h3>Example</h3><p><code> - Group www-group - </code></p></div> - - <p>It is recommended that you set up a new group specifically for - running the server. Some admins use user <code>nobody</code>, - but this is not always possible or desirable.</p> - - <div class="warning"><h3>Security</h3> - <p>Don't set <code class="directive">Group</code> (or <code class="directive"><a href="#user">User</a></code>) to <code>root</code> unless - you know exactly what you are doing, and what the dangers are.</p> - </div> - - <p>Special note: Use of this directive in <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> is no longer supported. To - configure your server for <code class="program"><a href="../programs/suexec.html">suexec</a></code> use - <code class="directive"><a href="../mod/mod_suexec.html#suexecusergroup">SuexecUserGroup</a></code>.</p> - - <div class="note"><h3>Note</h3> - <p>Although the <code class="directive">Group</code> directive is present - in the <code class="module"><a href="../mod/beos.html">beos</a></code> and <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> MPMs, - it is actually a no-op there and only exists for compatibility - reasons.</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="Listen" id="Listen">Listen</a> <a name="listen" id="listen">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>IP addresses and ports that the server -listens to</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Listen [<var>IP-address</var>:]<var>portnumber</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Required directive since Apache 2.0</td></tr> -</table> - <p>The <code class="directive">Listen</code> directive instructs Apache to - listen to only specific IP addresses or ports; by default it - responds to requests on all IP interfaces. <code class="directive">Listen</code> - is now a required directive. If it is not in the config file, the - server will fail to start. This is a change from previous versions - of Apache.</p> - - <p>The <code class="directive">Listen</code> directive tells the server to - accept incoming requests on the specified port or address-and-port - combination. If only a port number is specified, the server listens to - the given port on all interfaces. If an IP address is given as well - as a port, the server will listen on the given port and - interface.</p> - - <p>Multiple <code class="directive">Listen</code> directives may be used to - specify a number of addresses and ports to listen to. The server will - respond to requests from any of the listed addresses and ports.</p> - - <p>For example, to make the server accept connections on both - port 80 and port 8000, use:</p> - - <div class="example"><p><code> - Listen 80<br /> - Listen 8000 - </code></p></div> - - <p>To make the server accept connections on two specified - interfaces and port numbers, use </p> - - <div class="example"><p><code> - Listen 192.170.2.1:80<br /> - Listen 192.170.2.5:8000 - </code></p></div> - - <p>IPv6 addresses must be surrounded in square brackets, as in the - following example:</p> - - <div class="example"><p><code> - Listen [2001:db8::a00:20ff:fea7:ccea]:80 - </code></p></div> - - <div class="note"><h3>Error condition</h3> - Multiple <code class="directive">Listen</code> directives for the same ip - address and port will result in an <code>Address already in use</code> - error message. - </div> - -<h3>See also</h3> -<ul> -<li><a href="../dns-caveats.html">DNS Issues</a></li> -<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="directive-section"><h2><a name="ListenBackLog" id="ListenBackLog">ListenBackLog</a> <a name="listenbacklog" id="listenbacklog">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum length of the queue of pending connections</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ListenBacklog <var>backlog</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ListenBacklog 511</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The maximum length of the queue of pending connections. - Generally no tuning is needed or desired, however on some - systems it is desirable to increase this when under a TCP SYN - flood attack. See the backlog parameter to the - <code>listen(2)</code> system call.</p> - - <p>This will often be limited to a smaller number by the - operating system. This varies from OS to OS. Also note that - many OSes do not use exactly what is specified as the backlog, - but use a number based on (but normally larger than) what is - set.</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="LockFile" id="LockFile">LockFile</a> <a name="lockfile" id="lockfile">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the accept serialization lock file</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>LockFile <var>filename</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>LockFile logs/accept.lock</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">LockFile</code> directive sets the path to - the lockfile used when Apache is used with an <code class="directive"><a href="#acceptmutex">AcceptMutex</a></code> value of either - <code>fcntl</code> or <code>flock</code>. This directive should - normally be left at its default value. The main reason for changing - it is if the <code>logs</code> directory is NFS mounted, since - <strong>the lockfile must be stored on a local disk</strong>. The PID - of the main server process is automatically appended to the - filename.</p> - - <div class="warning"><h3>Security</h3> - <p>It is best to <em>avoid</em> putting this file in a world writable - directory such as <code>/var/tmp</code> because someone could create - a denial of service attack and prevent the server from starting by - creating a lockfile with the same name as the one the server will try - to create.</p> - </div> - -<h3>See also</h3> -<ul> -<li><code class="directive"><a href="#acceptmutex">AcceptMutex</a></code></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="MaxClients" id="MaxClients">MaxClients</a> <a name="maxclients" id="maxclients">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of connections that will be processed -simultaneously</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxClients <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">MaxClients</code> directive sets the limit - on the number of simultaneous requests that will be served. Any - connection attempts over the <code class="directive">MaxClients</code> - limit will normally be queued, up to a number based on the - <code class="directive"><a href="#listenbacklog">ListenBacklog</a></code> - directive. Once a child process is freed at the end of a different - request, the connection will then be serviced.</p> - - <p>For non-threaded servers (<em>i.e.</em>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>), - <code class="directive">MaxClients</code> translates into the maximum - number of child processes that will be launched to serve requests. - The default value is <code>256</code>; to increase it, you must also raise - <code class="directive"><a href="#serverlimit">ServerLimit</a></code>.</p> - - <p>For threaded and hybrid servers (<em>e.g.</em> <code class="module"><a href="../mod/beos.html">beos</a></code> - or <code class="module"><a href="../mod/worker.html">worker</a></code>) <code class="directive">MaxClients</code> restricts - the total number of threads that will be available to serve clients. - The default value for <code class="module"><a href="../mod/beos.html">beos</a></code> is <code>50</code>. For - hybrid MPMs the default value is <code>16</code> (<code class="directive"><a href="#serverlimit">ServerLimit</a></code>) multiplied by the value of - <code>25</code> (<code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code>). Therefore, to increase <code class="directive">MaxClients</code> to a value that requires more than 16 processes, - you must also raise <code class="directive"><a href="#serverlimit">ServerLimit</a></code>.</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="MaxMemFree" id="MaxMemFree">MaxMemFree</a> <a name="maxmemfree" id="maxmemfree">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum amount of memory that the main allocator is allowed -to hold without calling <code>free()</code></td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxMemFree <var>KBytes</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MaxMemFree 0</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code></td></tr> -</table> - <p>The <code class="directive">MaxMemFree</code> directive sets the - maximum number of free Kbytes that the main allocator is allowed - to hold without calling <code>free()</code>. When not set, or when set - to zero, the threshold will be set to unlimited.</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="MaxRequestsPerChild" id="MaxRequestsPerChild">MaxRequestsPerChild</a> <a name="maxrequestsperchild" id="maxrequestsperchild">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Limit on the number of requests that an individual child server -will handle during its life</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxRequestsPerChild <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>MaxRequestsPerChild 10000</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">MaxRequestsPerChild</code> directive sets - the limit on the number of requests that an individual child - server process will handle. After - <code class="directive">MaxRequestsPerChild</code> requests, the child - process will die. If <code class="directive">MaxRequestsPerChild</code> is - <code>0</code>, then the process will never expire.</p> - - <div class="note"><h3>Different default values</h3> - <p>The default value for <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code> and - <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code> is <code>0</code>.</p> - </div> - - <p>Setting <code class="directive">MaxRequestsPerChild</code> to a - non-zero value limits the amount of memory that process can consume - by (accidental) memory leakage.</p> - - <div class="note"><h3>Note</h3> - <p>For <code class="directive"><a href="../mod/core.html#keepalive">KeepAlive</a></code> requests, only - the first request is counted towards this limit. In effect, it - changes the behavior to limit the number of <em>connections</em> per - child.</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="MaxSpareThreads" id="MaxSpareThreads">MaxSpareThreads</a> <a name="maxsparethreads" id="maxsparethreads">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maximum number of idle threads</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MaxSpareThreads <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>Maximum number of idle threads. Different MPMs deal with this - directive differently.</p> - - <p>For <code class="module"><a href="../mod/perchild.html">perchild</a></code> the default is - <code>MaxSpareThreads 10</code>. This MPM monitors the number of - idle threads on a per-child basis. If there are too many idle - threads in that child, the server will begin to kill threads - within that child.</p> - - <p>For <code class="module"><a href="../mod/worker.html">worker</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code> and <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> the default is <code>MaxSpareThreads 250</code>. - These MPMs deal with idle threads on a server-wide basis. If there - are too many idle threads in the server then child processes are - killed until the number of idle threads is less than this number.</p> - - <p>For <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code> the default is - <code>MaxSpareThreads 100</code>. Since this MPM runs a - single-process, the spare thread count is also server-wide.</p> - - <p><code class="module"><a href="../mod/beos.html">beos</a></code> and <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> work - similar to <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>. The default for - <code class="module"><a href="../mod/beos.html">beos</a></code> is <code>MaxSpareThreads 50</code>. For - <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> the default value is <code>10</code>.</p> - - <div class="note"><h3>Restrictions</h3> - <p>The range of the <code class="directive">MaxSpareThreads</code> value - is restricted. Apache will correct the given value automatically - according to the following rules:</p> - <ul> - <li><code class="module"><a href="../mod/perchild.html">perchild</a></code> requires <code class="directive">MaxSpareThreads</code> to be less or equal than <code class="directive"><a href="#threadlimit">ThreadLimit</a></code>.</li> - - <li><code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code> wants the value to be greater than - <code class="directive"><a href="#minsparethreads">MinSpareThreads</a></code>.</li> - - <li>For <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> and - <code class="module"><a href="../mod/worker.html">worker</a></code> the value must be greater or equal than - the sum of <code class="directive"><a href="#minsparethreads">MinSpareThreads</a></code> - and <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code>.</li> - </ul> - </div> - -<h3>See also</h3> -<ul> -<li><code class="directive"><a href="#minsparethreads">MinSpareThreads</a></code></li> -<li><code class="directive"><a href="#startservers">StartServers</a></code></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="MinSpareThreads" id="MinSpareThreads">MinSpareThreads</a> <a name="minsparethreads" id="minsparethreads">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Minimum number of idle threads available to handle request -spikes</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>MinSpareThreads <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>Minimum number of idle threads to handle request spikes. - Different MPMs deal with this directive - differently.</p> - - <p><code class="module"><a href="../mod/perchild.html">perchild</a></code> uses a default of - <code>MinSpareThreads 5</code> and monitors the number of idle - threads on a per-child basis. If there aren't enough idle threads - in that child, the server will begin to create new threads within - that child. Thus, if you set <code class="directive"><a href="../mod/perchild.html#numservers">NumServers</a></code> to <code>10</code> and a <code class="directive">MinSpareThreads</code> value of <code>5</code>, you'll have - at least 50 idle threads on your system.</p> - - <p><code class="module"><a href="../mod/worker.html">worker</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code> and - <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> use a default of <code>MinSpareThreads - 75</code> and deal with idle threads on a server-wide basis. If - there aren't enough idle threads in the server then child - processes are created until the number of idle threads is greater - than number.</p> - - <p><code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code> uses a default of - <code>MinSpareThreads 10</code> and, since it is a single-process - MPM, tracks this on a server-wide bases.</p> - - <p><code class="module"><a href="../mod/beos.html">beos</a></code> and <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> work - similar to <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>. The default for - <code class="module"><a href="../mod/beos.html">beos</a></code> is <code>MinSpareThreads 1</code>. For - <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> the default value is <code>5</code>.</p> - -<h3>See also</h3> -<ul> -<li><code class="directive"><a href="#maxsparethreads">MaxSpareThreads</a></code></li> -<li><code class="directive"><a href="#startservers">StartServers</a></code></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="PidFile" id="PidFile">PidFile</a> <a name="pidfile" id="pidfile">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>File where the server records the process ID -of the daemon</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>PidFile <var>filename</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>PidFile logs/httpd.pid</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">PidFile</code> directive sets the file to - which the server records the process id of the daemon. If the - filename is not absolute then it is assumed to be relative to the - <code class="directive"><a href="../mod/core.html#serverroot">ServerRoot</a></code>.</p> - - <div class="example"><h3>Example</h3><p><code> - PidFile /var/run/apache.pid - </code></p></div> - - <p>It is often useful to be able to send the server a signal, - so that it closes and then re-opens its <code class="directive"><a href="../mod/core.html#errorlog">ErrorLog</a></code> and <code class="directive"><a href="../mod/mod_log_config.html#transferlog">TransferLog</a></code>, and - re-reads its configuration files. This is done by sending a - SIGHUP (kill -1) signal to the process id listed in the - <code class="directive">PidFile</code>.</p> - - <p>The <code class="directive">PidFile</code> is subject to the same - warnings about log file placement and <a href="../misc/security_tips.html#serverroot">security</a>.</p> - - <div class="note"><h3>Note</h3> - <p>As of Apache 2 it is recommended to use only the <code class="program"><a href="../programs/apachectl.html">apachectl</a></code> script for (re-)starting or stopping the server.</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="ReceiveBufferSize" id="ReceiveBufferSize">ReceiveBufferSize</a> <a name="receivebuffersize" id="receivebuffersize">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>TCP receive buffer size</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ReceiveBufferSize <var>bytes</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ReceiveBufferSize 0</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The server will set the TCP receive buffer size to the number of - bytes specified.</p> - - <p>If set to the value of <code>0</code>, the server will use the - OS default.</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="ScoreBoardFile" id="ScoreBoardFile">ScoreBoardFile</a> <a name="scoreboardfile" id="scoreboardfile">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Location of the file used to store coordination data for -the child processes</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScoreBoardFile <var>file-path</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ScoreBoardFile logs/apache_status</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>Apache uses a scoreboard to communicate between its parent - and child processes. Some architectures require a file to facilitate - this communication. If the file is left unspecified, Apache first - attempts to create the scoreboard entirely in memory (using anonymous - shared memory) and, failing that, will attempt to create the file on - disk (using file-based shared memory). Specifying this directive causes - Apache to always create the file on the disk.</p> - - <div class="example"><h3>Example</h3><p><code> - ScoreBoardFile /var/run/apache_status - </code></p></div> - - <p>File-based shared memory is useful for third-party applications - that require direct access to the scoreboard.</p> - - <p>If you use a <code class="directive">ScoreBoardFile</code> then - you may see improved speed by placing it on a RAM disk. But be - careful that you heed the same warnings about log file placement - and <a href="../misc/security_tips.html">security</a>.</p> - -<h3>See also</h3> -<ul> -<li><a href="../stopping.html">Stopping and Restarting -Apache</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="SendBufferSize" id="SendBufferSize">SendBufferSize</a> <a name="sendbuffersize" id="sendbuffersize">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>TCP buffer size</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>SendBufferSize <var>bytes</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>SendBufferSize 0</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The server will set the TCP send buffer size to the number of bytes - specified. Very useful to increase past standard OS defaults on - high speed high latency (<em>i.e.</em>, 100ms or so, such as - transcontinental fast pipes).</p> - - <p>If set to the value of <code>0</code>, the server will use the - OS default.</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="ServerLimit" id="ServerLimit">ServerLimit</a> <a name="serverlimit" id="serverlimit">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Upper limit on configurable number of processes</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ServerLimit <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>For the <code class="module"><a href="../mod/prefork.html">prefork</a></code> MPM, this directive sets the - maximum configured value for <code class="directive"><a href="#maxclients">MaxClients</a></code> for the lifetime of the - Apache process. For the <code class="module"><a href="../mod/worker.html">worker</a></code> MPM, this directive - in combination with <code class="directive"><a href="#threadlimit">ThreadLimit</a></code> sets - the maximum configured value for <code class="directive"><a href="#maxclients">MaxClients</a></code> for the lifetime of the - Apache process. Any attempts to change this directive during a - restart will be ignored, but <code class="directive"><a href="#maxclients">MaxClients</a></code> can be modified during - a restart.</p> - - <p>Special care must be taken when using this directive. If - <code class="directive">ServerLimit</code> is set to a value much higher - than necessary, extra, unused shared memory will be allocated. If - both <code class="directive">ServerLimit</code> and <code class="directive"><a href="#maxclients">MaxClients</a></code> are set to values - higher than the system can handle, Apache may not start or the - system may become unstable.</p> - - <p>With the <code class="module"><a href="../mod/prefork.html">prefork</a></code> MPM, use this directive only - if you need to set <code class="directive"><a href="#maxclients">MaxClients</a></code> higher than 256 (default). - Do not set the value of this directive any higher than what you - might want to set <code class="directive"><a href="#maxclients">MaxClients</a></code> to.</p> - - <p>With <code class="module"><a href="../mod/worker.html">worker</a></code>, <code class="module"><a href="../mod/leader.html">leader</a></code> and - <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> use this directive only - if your <code class="directive"><a href="#maxclients">MaxClients</a></code> and - <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code> - settings require more than 16 server processes (default). Do not set - the value of this directive any higher than the number of server - processes required by what you may want for <code class="directive"><a href="#maxclients ">MaxClients </a></code> and <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code>.</p> - - <p>With the <code class="module"><a href="../mod/perchild.html">perchild</a></code> MPM, use this directive only - if you need to set <code class="directive"><a href="../mod/perchild.html#numservers">NumServers</a></code> higher than 8 (default).</p> - - <div class="note"><h3>Note</h3> - <p>There is a hard limit of <code>ServerLimit 20000</code> compiled - into the server. This is intended to avoid nasty effects caused by - typos.</p> - </div> - -<h3>See also</h3> -<ul> -<li><a href="../stopping.html">Stopping and Restarting Apache</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="StartServers" id="StartServers">StartServers</a> <a name="startservers" id="startservers">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of child server processes created at startup</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>StartServers <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>The <code class="directive">StartServers</code> directive sets the - number of child server processes created on startup. As the number - of processes is dynamically controlled depending on the load, - there is usually little reason to adjust this parameter.</p> - - <p>The default value differs from MPM to MPM. For - <code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code> and - <code class="module"><a href="../mod/worker.html">worker</a></code> the default is <code>StartServers 3</code>. - For <code class="module"><a href="../mod/prefork.html">prefork</a></code> defaults to <code>5</code> and for - <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> to <code>2</code>.</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="StartThreads" id="StartThreads">StartThreads</a> <a name="startthreads" id="startthreads">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of threads created on startup</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>StartThreads <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/beos.html">beos</a></code>, <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code></td></tr> -</table> - <p>Number of threads created on startup. As the - number of threads is dynamically controlled depending on the - load, there is usually little reason to adjust this - parameter.</p> - - <p>For <code class="module"><a href="../mod/perchild.html">perchild</a></code> the default is <code>StartThreads - 5</code> and this directive tracks the number of threads per - process at startup.</p> - - <p>For <code class="module"><a href="../mod/mpm_netware.html">mpm_netware</a></code> the default is - <code>StartThreads 50</code> and, since there is only a single - process, this is the total number of threads created at startup to - serve requests.</p> - - <p>For <code class="module"><a href="../mod/beos.html">beos</a></code> the default is <code>StartThreads - 10</code>. It also reflects the total number of threads created - at startup to serve requests.</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="ThreadLimit" id="ThreadLimit">ThreadLimit</a> <a name="threadlimit" id="threadlimit">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sets the upper limit on the configurable number of threads -per child process</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ThreadLimit <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available for <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code> in Apache 2.0.41 -and later</td></tr> -</table> - <p>This directive sets the maximum configured value for <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code> for the lifetime - of the Apache process. Any attempts to change this directive - during a restart will be ignored, but <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code> can be modified - during a restart up to the value of this directive.</p> - - <p>Special care must be taken when using this directive. If - <code class="directive">ThreadLimit</code> is set to a value much higher - than <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code>, - extra unused shared memory will be allocated. If both - <code class="directive">ThreadLimit</code> and <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code> are set to values - higher than the system can handle, Apache may not start or the - system may become unstable. Do not set the value of this directive - any higher than your greatest predicted setting of <code class="directive"><a href="#threadsperchild">ThreadsPerChild</a></code> for the - current run of Apache.</p> - - <p>The default value for <code class="directive">ThreadLimit</code> is - <code>1920</code> when used with <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code> and - <code>64</code> when used with the others.</p> - - <div class="note"><h3>Note</h3> - <p>There is a hard limit of <code>ThreadLimit 20000</code> (or - <code>ThreadLimit 15000</code> with <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>) - compiled into the server. This is intended to avoid nasty effects - caused by typos.</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="ThreadsPerChild" id="ThreadsPerChild">ThreadsPerChild</a> <a name="threadsperchild" id="threadsperchild">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Number of threads created by each child process</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ThreadsPerChild <var>number</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>See usage for details</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -</table> - <p>This directive sets the number of threads created by each - child process. The child creates these threads at startup and - never creates more. If using an MPM like <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code>, - where there is only one child process, this number should be high - enough to handle the entire load of the server. If using an MPM - like <code class="module"><a href="../mod/worker.html">worker</a></code>, where there are multiple child processes, - the <em>total</em> number of threads should be high enough to handle - the common load on the server.</p> - - <p>The default value for <code class="directive">ThreadsPerChild</code> is - <code>64</code> when used with <code class="module"><a href="../mod/mpm_winnt.html">mpm_winnt</a></code> and - <code>25</code> when used with the others.</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="User" id="User">User</a> <a name="user" id="user">Directive</a></h2> -<table class="directive"> -<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The userid under which the server will answer -requests</td></tr> -<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>User <var>unix-userid</var></code></td></tr> -<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>User #-1</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><code class="module"><a href="../mod/leader.html">leader</a></code>, <code class="module"><a href="../mod/perchild.html">perchild</a></code>, <code class="module"><a href="../mod/prefork.html">prefork</a></code>, <code class="module"><a href="../mod/threadpool.html">threadpool</a></code>, <code class="module"><a href="../mod/worker.html">worker</a></code></td></tr> -<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Only valid in global server config since Apache -2.0</td></tr> -</table> - <p>The <code class="directive">User</code> directive sets the user ID as - which the server will answer requests. 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, and will instead continue to run as - that original user. If you do start the server as <code>root</code>, - then it is normal for the parent process to remain running as root. - <var>Unix-userid</var> is one of:</p> - - <dl> - <dt>A username</dt> - <dd>Refers to the given user by name.</dd> - - <dt># followed by a user number.</dt> - <dd>Refers to a user by its number.</dd> - </dl> - - <p>The user should have no privileges that result in it being - able to access files that are not intended to be visible to the - outside world, and similarly, the user should not be able to - execute code that is not meant for HTTP requests. It is - recommended that you set up a new user and group specifically for - running the server. Some admins use user <code>nobody</code>, but - this is not always desirable, since the <code>nobody</code> user - can have other uses on the system.</p> - - <div class="warning"><h3>Security</h3> - <p>Don't set <code class="directive">User</code> (or <code class="directive"><a href="#group">Group</a></code>) to <code>root</code> unless - you know exactly what you are doing, and what the dangers are.</p> - </div> - - <p>With the <code class="module"><a href="../mod/perchild.html">perchild</a></code> MPM, which is intended to - server virtual hosts run under different user IDs, the - <code class="directive">User</code> directive defines the user ID for the - main server and the fallback for <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> sections without an - <code class="directive"><a href="../mod/perchild.html#assignuserid">AssignUserID</a></code> directive.</p> - - <p>Special note: Use of this directive in <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code> is no longer supported. To - configure your server for <code class="program"><a href="../programs/suexec.html">suexec</a></code> use - <code class="directive"><a href="../mod/mod_suexec.html#suexecusergroup">SuexecUserGroup</a></code>.</p> - - <div class="note"><h3>Note</h3> - <p>Although the <code class="directive">User</code> directive is present - in the <code class="module"><a href="../mod/beos.html">beos</a></code> and <code class="module"><a href="../mod/mpmt_os2.html">mpmt_os2</a></code> MPMs, - it is actually a no-op there and only exists for compatibility - reasons.</p> - </div> - -</div> -</div> -<div class="bottomlang"> -<p><span>Available Languages: </span><a href="../de/mod/mpm_common.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> | -<a href="../en/mod/mpm_common.html" title="English"> en </a> | -<a href="../es/mod/mpm_common.html" hreflang="es" rel="alternate" title="Español"> es </a> | -<a href="../ja/mod/mpm_common.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | -<a href="../tr/mod/mpm_common.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </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>
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