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<title>Server-Wide Configuration - Apache HTTP Server</title>
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<p class="menu"><a href="/mod/">Modules</a> | <a href="/mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="/glossary.html">Glossary</a> | <a href="/sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.5</p>
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<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 2.5</a></div><div id="page-content"><div id="preamble"><h1>Server-Wide Configuration</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="/en/server-wide.html" title="English"> en </a> |
</div>
<p>This document explains some of the directives provided by
the <code class="module"><a href="/mod/core.html">core</a></code> server which are used to configure
the basic operations of the server.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="/images/down.gif" /> <a href="#identification">Server Identification</a></li>
</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="section">
<h2><a name="identification" id="identification">Server Identification</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="/mod/core.html#servername">ServerName</a></code></li><li><code class="directive"><a href="/mod/core.html#serveradmin">ServerAdmin</a></code></li><li><code class="directive"><a href="/mod/core.html#serversignature">ServerSignature</a></code></li><li><code class="directive"><a href="/mod/core.html#servertokens">ServerTokens</a></code></li><li><code class="directive"><a href="/mod/core.html#usecanonicalname">UseCanonicalName</a></code></li><li><code class="directive"><a href="/mod/core.html#usecanonicalphysicalport">UseCanonicalPhysicalPort</a></code></li></ul></td></tr></table>
control what information about the server will be presented
in server-generated documents such as error messages. The
sets the value of the Server HTTP response header field.</p>
<code class="directive"><a href="/mod/core.html#usecanonicalphysicalport">UseCanonicalPhysicalPort</a></code>
directives are used by the server to determine how to construct
self-referential URLs. For example, when a client requests a
directory, but does not include the trailing slash in the
directory name, httpd must redirect the client to the full
name including the trailing slash so that the client will
correctly resolve relative references in the document.</p>
<div class="section">
<h2><a name="locations" id="locations">File Locations</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="/mod/mpm_common.html#coredumpdirectory">CoreDumpDirectory</a></code></li><li><code class="directive"><a href="/mod/core.html#documentroot">DocumentRoot</a></code></li><li><code class="directive"><a href="/mod/core.html#errorlog">ErrorLog</a></code></li><li><code class="directive"><a href="/mod/core.html#mutex">Mutex</a></code></li><li><code class="directive"><a href="/mod/mpm_common.html#pidfile">PidFile</a></code></li><li><code class="directive"><a href="/mod/mpm_common.html#scoreboardfile">ScoreBoardFile</a></code></li><li><code class="directive"><a href="/mod/core.html#serverroot">ServerRoot</a></code></li></ul></td></tr></table>
<p>These directives control the locations of the various files
that httpd needs for proper operation. When the pathname used
does not begin with a slash (/), the files are located relative
to the <code class="directive"><a href="/mod/core.html#serverroot">ServerRoot</a></code>. Be careful
about locating files in paths which are writable by non-root users.
documentation for more details.</p>
<div class="section">
<h2><a name="resource" id="resource">Limiting Resource Usage</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="/mod/core.html#limitrequestbody">LimitRequestBody</a></code></li><li><code class="directive"><a href="/mod/core.html#limitrequestfields">LimitRequestFields</a></code></li><li><code class="directive"><a href="/mod/core.html#limitrequestfieldsize">LimitRequestFieldsize</a></code></li><li><code class="directive"><a href="/mod/core.html#limitrequestline">LimitRequestLine</a></code></li><li><code class="directive"><a href="/mod/core.html#rlimitcpu">RLimitCPU</a></code></li><li><code class="directive"><a href="/mod/core.html#rlimitmem">RLimitMEM</a></code></li><li><code class="directive"><a href="/mod/core.html#rlimitnproc">RLimitNPROC</a></code></li><li><code class="directive"><a href="/mod/mpm_common.html#threadstacksize">ThreadStackSize</a></code></li></ul></td></tr></table>
<p>The <code class="directive">LimitRequest</code>*
directives are used to place limits on the amount of resources
httpd will use in reading requests from clients. By limiting
these values, some kinds of denial of service attacks can be
mitigated.</p>
<p>The <code class="directive">RLimit</code>* directives
are used to limit the amount of resources which can be used by
processes forked off from the httpd children. In particular,
this will control resources used by CGI scripts and SSI exec
commands.</p>
<p>The <code class="directive"><a href="/mod/mpm_common.html#threadstacksize">ThreadStackSize</a></code>
directive is used with some platforms to control the stack size.</p>
<div class="section">
<h2><a name="implementation" id="implementation">Implementation Choices</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="/mod/core.html#mutex">Mutex</a></code></li></ul></td></tr></table>
<p>The <code class="directive">Mutex</code> directive can be used to change
the underlying implementation used for mutexes, in order to relieve
functional or performance problems with <a class="glossarylink" href="/glossary.html#apr" title="see glossary">APR</a>'s
default choice.</p>
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