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<title>Server-Wide Configuration - Apache HTTP Server Version 2.4</title>
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<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"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#identification">Server Identification</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#locations">File Locations</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#resource">Limiting Resource Usage</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#implementation">Implementation Choices</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><a href="#comments_section">Comments</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="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>

<p>The <code class="directive"><a href="./mod/core.html#serveradmin">ServerAdmin</a></code> and
    <code class="directive"><a href="./mod/core.html#servertokens">ServerTokens</a></code> directives
    control what information about the server will be presented
    in server-generated documents such as error messages. The
    <code class="directive"><a href="./mod/core.html#servertokens">ServerTokens</a></code> directive
    sets the value of the Server HTTP response header field.</p>

<p>The <code class="directive"><a href="./mod/core.html#servername">ServerName</a></code>,
    <code class="directive"><a href="./mod/core.html#usecanonicalname">UseCanonicalName</a></code> and
    <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><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<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.
    See the <a href="misc/security_tips.html#serverroot">security tips</a>
    documentation for more details.</p>
  </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<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><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<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>
  </div></div>
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</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&amp;A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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