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<title>Starting Apache - Apache HTTP Server Version 2.4</title>
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<body id="manual-page">
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Modules | Directives | FAQ | Glossary | Sitemap
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Apache HTTP Server Version 2.4
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<-
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Apache > HTTP Server > Documentation > Version 2.4
Starting Apache
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Available Languages:  de  |
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 en  |
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 es  |
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 fr  |
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 ja  |
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 ko  |
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 tr 
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On Windows, Apache is normally run as a service.
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    For details, see Running Apache as a Service.
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On Unix, the httpd program
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    is run as a daemon that executes continuously in the
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    background to handle requests.  This document describes how
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    to invoke httpd.
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  •  Errors During Start-up
    		•
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  •  Starting at Boot-Time
    		•
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  •  Additional Information
    		•
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    See also
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    top
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    How Apache Starts
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    If the Listen
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        specified in the configuration file is default of 80 (or any other
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        port below 1024), then it is necessary to have root privileges in
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        order to start apache, so that it can bind to this privileged
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        port. Once the server has started and performed a few preliminary
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        activities such as opening its log files, it will launch several
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        child processes which do the work of listening for and
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        answering requests from clients. The main httpd
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        process continues to run as the root user, but the child processes
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        run as a less privileged user. This is controlled by the selected
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        Multi-Processing Module.
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    The recommended method of invoking the httpd
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        executable is to use the apachectl control script. This
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        script sets certain environment variables that are necessary for
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        httpd to function correctly under some operating
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        systems, and then invokes the httpd binary.
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        apachectl will pass through any command line
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        arguments, so any httpd options may also be used with
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        apachectl.  You may also directly edit the
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        apachectl script by changing the HTTPD
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        variable near the top to specify the correct location of the
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        httpd binary and any command-line arguments that you
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        wish to be always present.
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    The first thing that httpd does when it is
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        invoked is to locate and read the configuration file
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        httpd.conf. The location of this file is set at
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        compile-time, but it is possible to specify its location at run
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        time using the -f command-line option as in
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    /usr/local/apache2/bin/apachectl -f
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          /usr/local/apache2/conf/httpd.conf
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    If all goes well during startup, the server will detach from
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        the terminal and the command prompt will return almost
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        immediately. This indicates that the server is up and running.
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        You can then use your browser to connect to the server and view
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        the test page in the DocumentRoot directory.
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    top
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    Errors During Start-up
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    If Apache suffers a fatal problem during startup, it will
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        write a message describing the problem either to the console or
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        to the ErrorLog before
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        exiting. One of the most common error messages is "Unable
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        to bind to Port ...". This message is usually caused by
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        either:
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    • Trying to start the server on a privileged port when not
      		•
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            logged in as the root user; or
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    • 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
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            Port.
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      For further trouble-shooting instructions, consult the
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          Apache FAQ.
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      top
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      Starting at Boot-Time
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      If you want your server to continue running after a system
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          reboot, you should add a call to apachectl to your
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          system startup files (typically rc.local or a file in
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          an rc.N directory). This will start Apache as
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          root. Before doing this ensure that your server is properly
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          configured for security and access restrictions.
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      The apachectl script is designed to act like a
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          standard SysV init script; it can take the arguments
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          start, restart, and stop
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          and translate them into the appropriate signals to
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          httpd.  So you can often simply link
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          apachectl into the appropriate init directory. But be
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          sure to check the exact requirements of your system.
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      top
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      Additional Information
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      Additional information about the command-line options of httpd and apachectl as well as other support
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          programs included with the server is available on the
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          Server and Supporting Programs page.
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          There is also documentation on all the modules included with the Apache distribution
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          and the directives that they
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          provide.
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      Available Languages:  de  |
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       en  |
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       es  |
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       fr  |
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       ja  |
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       ko  |
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       tr 
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      top
      Comments
      Notice:
      This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again 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 Freenode, or sent to our mailing lists.
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