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<title>Server-Wide Configuration - Apache HTTP Server</title>
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<p class="apache">Apache HTTP Server Version 2.0</p>
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<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs-project/">Documentation</a> &gt; <a href="./">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Server-Wide Configuration</h1>
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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>
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<div id="quickview"><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>
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<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></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> and
    <code class="directive"><a href="./mod/core.html#usecanonicalname">UseCanonicalName</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, Apache 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>
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<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/mpm_common.html#lockfile">LockFile</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 Apache 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>
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<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_netware.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
    Apache 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 Apache 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_netware.html#threadstacksize">ThreadStackSize</a></code> directive
    is used only on Netware to control the stack size.</p>
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