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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90639 13f79535-47bb-0310-9956-ffa450edef68
119 lines
4.7 KiB
HTML
119 lines
4.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Starting Apache</TITLE>
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</HEAD>
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<!-- Background white, links blue (unvisited), navy (visited), red (active) -->
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<BODY
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#000080"
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ALINK="#FF0000"
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>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Starting Apache</H1>
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<ul>
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<li><a href="#windows">Starting Apache on Windows</a></li>
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<li><a href="#unix">Starting Apache on Unix</a>
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<ul>
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<li><a href="#errors">Errors During Start-up</a></li>
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<li><a href="#boot">Starting at Boot-Time</a></li>
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<li><a href="#info">Additional Information</a></li>
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</ul>
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</li>
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</ul>
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<hr>
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<h2><a name="windows">Starting Apache On Windows</a></h2>
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<p>On Windows, Apache is normally run as a service on Windows NT, or
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as a console application on Windows 95. For details, see <A
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HREF="platform/windows.html#run">running Apache for Windows</A>.</p>
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<h2><a name="unix">Starting Apache on Unix</a></h2>
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<p>On Unix, the <a href="programs/httpd.html">httpd</a> program is run
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as a daemon which executes continuously in the background to handle
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requests.</p>
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<p>If the <a href="mod/core.html#port">Port</a> specified in the
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configuration file is the default of 80 (or any other port below
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1024), then it is necessary to have root privileges in order to start
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apache, so that it can bind to this privileged port. Once the server
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has started and performed a few preliminary activities such as opening
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its log files, it will launch several <em>child</em> processes which
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do the work of listening for and answering requests from clients. The
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main <code>httpd</code> process continues to run as the root user, but
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the child processes run as a less privileged user. This is controlled
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by the selected <a href="mpm.html">Multi-Processing Module</a>.</p>
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<p>The first thing that <code>httpd</code> does when it is invoked is
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to locate and read the <a href="configuring.html">configuration
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file</a> <code>httpd.conf</code>. The location of this file is set at
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compile-time, but it is possible to specify its location at run time
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using the <code>-f</code> command-line option as in</p>
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<blockquote><code> /usr/local/apache/bin/httpd -f
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/usr/local/apache/conf/httpd.conf </code></blockquote>
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<p>As an alternative to invoking the <code>httpd</code> binary
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directly, a shell script called <a
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href="programs/apachectl.html">apachectl</a> is provided which can be
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used to control the daemon process with simple commands such as
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<code>apachectl start</code> and <code>apachectl stop</code>.</p>
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<p>If all goes well during startup, the server will detach from the
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terminal and the command prompt will return almost immediately.
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This indicates that the server is up and running. You can then
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use your browser to connect to the server and view the test
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page in the <a href="mod/core.html#documentroot">DocumentRoot</a>
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directory and the local copy of the documentation linked from
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that page.</p>
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<h3><a name="errors">Errors During Start-up</a></h3>
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<p>If Apache suffers a fatal problem during startup, it will write a
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message describing the problem either to the console or to the <a
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href="mod/core.html#errorlog">ErrorLog</a> before exiting. One of the
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most common error messages is "<code>Unable to bind to Port
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...</code>". This message is usually caused by either:</p>
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<ul>
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<li>Trying to start the server on a privileged port when not
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logged in as the root user; or</li>
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<li>Trying to start the server when there is another instance
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of Apache or some other web server already bound to the same Port.</li>
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</ul>
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<p>For further trouble-shooting instructions, consult the Apache <a
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href="faq/">FAQ</a>.</p>
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<h3><a name="boot">Starting at Boot-Time</a></h3>
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<p>If you want your server to continue running after a system reboot,
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you should add a call to <code>httpd</code> or <code>apachectl</code>
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to your system startup files (typically <code>rc.local</code> or a
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file in an <code>rc.N</code> directory). This will start Apache as
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root. Before doing this ensure that your server is properly configured
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for security and access restrictions. The <code>apachectl</code>
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script is designed so that it can often be linked directly as an init
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script, but be sure to check the exact requirements of your system.</p>
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<h3><a name="info">Additional Information</a></h3>
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<p>Additional information about the command-line options of <a
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href="programs/httpd.html">httpd</a> and <a
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href="programs/apachectl.html">apachectl</a> as well as other support
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programs included with the server is available on the <a
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href="programs/">Server and Supporting Programs</a> page. There is
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also documentation on all the <a href="mod/">modules</a> included with
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the Apache distribution and the <a
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href="mod/directives.html">directives</a> that they provide.</p>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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