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<title>Compiling and Installing - Apache HTTP Server</title>
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<p>This document covers compilation and installation of the Apache HTTP Server
    on Unix and Unix-like systems only. For compiling and
    installation on Windows, see <a href="platform/windows.html">Using Apache HTTP Server with Microsoft
    Windows</a>. For other platforms, see the <a href="platform/">platform</a> documentation.</p>

<p>Apache httpd uses <code>libtool</code> and <code>autoconf</code>
    to create a build environment that looks like many other Open Source
    projects.</p>

<p>If you are upgrading from one minor version to the next (for
    example, 2.2.50 to 2.2.51), please skip down to the <a href="#upgrading">upgrading</a> section.</p>

</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#overview">Overview for the
    impatient</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#requirements">Requirements</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#download">Download</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#extract">Extract</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#configure">Configuring the source tree</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#compile">Build</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#install">Install</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#customize">Customize</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#test">Test</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#upgrading">Upgrading</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#thirdp">Third-party packages</a></li>
</ul><h3>See also</h3><ul class="seealso"><li><a href="programs/configure.html">Configure the source tree</a></li><li><a href="invoking.html">Starting Apache httpd</a></li><li><a href="stopping.html">Stopping and Restarting</a></li></ul><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="overview" id="overview">Overview for the
    impatient</a></h2>

<table>
      
      <tr>
        <td><a href="#download">Download</a></td>

<td><code>$ lynx http://httpd.apache.org/download.cgi</code>
        </td>
      </tr>

<tr>
        <td><a href="#extract">Extract</a></td>

<td><code>$ gzip -d httpd-<em>NN</em>.tar.gz<br />
         $ tar xvf httpd-<em>NN</em>.tar<br />
         $ cd httpd-<em>NN</em></code></td>
      </tr>

<tr>
        <td><a href="#configure">Configure</a></td>

<td><code>$ ./configure --prefix=<em>PREFIX</em></code>
        </td>
      </tr>

<tr>
        <td><a href="#compile">Compile</a></td>

<tr>
        <td><a href="#install">Install</a></td>

<td><code>$ make install</code> </td>
      </tr>

<tr>
        <td><a href="#customize">Customize</a></td>

<td><code>$ vi <em>PREFIX</em>/conf/httpd.conf</code> </td>
      </tr>

<td><code>$ <em>PREFIX</em>/bin/apachectl -k start</code>
        </td>
      </tr>
    </table>

<p><em>NN</em> must be replaced with the current version
    number, and <em>PREFIX</em> must be replaced with the
    filesystem path under which the server should be installed. If
    <em>PREFIX</em> is not specified, it defaults to
    <code>/usr/local/apache2</code>.</p>

<p>Each section of the compilation and installation process is
    described in more detail below, beginning with the requirements
    for compiling and installing Apache httpd.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="requirements" id="requirements">Requirements</a></h2>

<p>The following requirements exist for building Apache httpd:</p>

<dl>
      <dt>APR and APR-Util</dt>
      <dd>Make sure you have APR and APR-Util already installed on
      your system. If you don't, or prefer to not use the system-provided
      versions, download the latest versions of both APR and APR-Util
      from <a href="http://apr.apache.org/">Apache APR</a>, unpack
      them into <code>./srclib/apr</code> and <code>./srclib/apr-util</code>
      (be sure the domain names do not have version numbers; for example,
      the APR distribution must be under ./srclib/apr/) and use
      <code>./configure</code>'s <code>--with-included-apr</code>
      option.  On some platforms, you may have to install the 
      corresponding <code>-dev</code> packages to allow httpd to build 
      against your installed copy of APR and APR-Util.</dd>

<dt>Perl-Compatible Regular Expressions Library (PCRE)</dt>
      <dd>This library is required but not longer bundled with httpd.  
      Download the source code from <a href="http://www.pcre.org/">http://www.pcre.org</a>, 
      or install a Port or Package.  If your build system can't find
      the pcre-config script installed by the PCRE build, point to it
      using the <code>--with-pcre</code> parameter.  On some platforms, 
      you may have to install the corresponding <code>-dev</code> 
      package to allow httpd to build against your installed copy 
      of PCRE.</dd>
      
      <dt>Disk Space</dt>
      <dd>Make sure you have at least 50 MB of temporary free disk
      space available. After installation the server occupies
      approximately 10 MB of disk space. The actual disk space
      requirements will vary considerably based on your chosen
      configuration options, any third-party modules, and, of course,
      the size of the web site or sites that you have on the server.</dd>

<dt>ANSI-C Compiler and Build System</dt>
      <dd>Make sure you have an ANSI-C compiler installed. The <a href="http://gcc.gnu.org/">GNU C
      compiler (GCC)</a> from the <a href="http://www.gnu.org/">Free Software Foundation (FSF)</a>
      is recommended. If you don't have GCC
      then at least make sure your vendor's compiler is ANSI
      compliant. In addition, your <code>PATH</code> must contain
      basic build tools such as <code>make</code>.</dd>

<dt>Accurate time keeping</dt>
      <dd>Elements of the HTTP protocol are expressed as the time of
      day. So, it's time to investigate setting some time
      synchronization facility on your system. Usually the
      <code>ntpdate</code> or <code>xntpd</code> programs are used for
      this purpose which are based on the Network Time Protocol (NTP).
      See the <a href="http://www.ntp.org">NTP
      homepage</a> for more details about NTP software and public
      time servers.</dd>

<dt><a href="http://www.perl.org/">Perl 5</a>
      [OPTIONAL]</dt>
      <dd>For some of the support scripts like <code class="program"><a href="./programs/apxs.html">apxs</a></code> or <code class="program"><a href="./programs/dbmmanage.html">dbmmanage</a></code> (which are
      written in Perl) the Perl 5 interpreter is required (versions
      5.003 or newer are sufficient). If you have multiple Perl
      interpreters (for example, a systemwide install of Perl 4, and
      your own install of Perl 5), you are advised to use the
      <code>--with-perl</code> option (see below) to make sure the
      correct one is used by <code class="program"><a href="./programs/configure.html">configure</a></code>.
      If no Perl 5 interpreter is found by the
      <code class="program"><a href="./programs/configure.html">configure</a></code> script, you will not be able to use
      the affected support scripts. Of course, you will still be able to
      build and use Apache httpd.</dd>
    </dl>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="download" id="download">Download</a></h2>

<p>The Apache HTTP Server can be downloaded from the <a href="http://httpd.apache.org/download.cgi">Apache HTTP Server
    download site</a>, which lists several mirrors.  Most users of
    Apache on unix-like systems will be better off downloading and
    compiling a source version.  The build process (described below) is
    easy, and it allows you to customize your server to suit your needs.
    In addition, binary releases are often not up to date with the latest
    source releases.  If you do download a binary, follow the instructions
    in the <code>INSTALL.bindist</code> file inside the distribution.</p>

<p>After downloading, it is important to verify that you have a
    complete and unmodified version of the Apache HTTP Server. This
    can be accomplished by testing the downloaded tarball against the
    PGP signature.  Details on how to do this are available on the <a href="http://httpd.apache.org/download.cgi#verify">download
    page</a> and an extended example is available describing the <a href="http://httpd.apache.org/dev/verification.html">use of
    PGP</a>.</p>

</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="extract" id="extract">Extract</a></h2>

<p>Extracting the source from the Apache HTTP Server tarball is a
    simple matter of uncompressing, and then untarring:</p>

<div class="example"><p><code>
$ gzip -d httpd-<em>NN</em>.tar.gz<br />
$ tar xvf httpd-<em>NN</em>.tar
</code></p></div>

<p>This will create a new directory under the current directory
    containing the source code for the distribution. You should
    <code>cd</code> into that directory before proceeding with
    compiling the server.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="configure" id="configure">Configuring the source tree</a></h2>

<p>The next step is to configure the Apache source tree for your
    particular platform and personal requirements. This is done using
    the script <code class="program"><a href="./programs/configure.html">configure</a></code> included in
    the root directory of the distribution. (Developers downloading
    an unreleased version of the Apache source tree will need to have
    <code>autoconf</code> and <code>libtool</code> installed and will
    need to run <code>buildconf</code> before proceeding with the next
    steps. This is not necessary for official releases.)</p>

<p>To configure the source tree using all the default options,
    simply type <code>./configure</code>. To change the default
    options, <code class="program"><a href="./programs/configure.html">configure</a></code> accepts a variety of variables
    and command line options.</p>

<p>The most important option is the location <code>--prefix</code>
    where Apache is to be installed later, because Apache has to be
    configured for this location to work correctly.  More fine-tuned
    control of the location of files is possible with additional <a href="programs/configure.html#installationdirectories">configure
    options</a>.</p>

<p>Also at this point, you can specify which <a href="programs/configure.html#optionalfeatures">features</a> you
    want included in Apache by enabling and disabling <a href="mod/">modules</a>.  Apache comes with a wide range of modules
    included by default.  They will be compiled as
    <a href="dso.html">shared objects (DSOs)</a> which can be loaded
    or unloaded at runtime.
    You can also choose to compile modules statically by using the option
    <code>--enable-<var>module</var>=static</code>.</p>

<p>Additional modules are enabled using the
    <code>--enable-<var>module</var></code> option, where
    <var>module</var> is the name of the module with the
    <code>mod_</code> string removed and with any underscore converted
    to a dash.  Similarly, you can disable modules with the
    <code>--disable-<var>module</var></code> option.  Be careful when
    using these options, since <code class="program"><a href="./programs/configure.html">configure</a></code> cannot warn you
    if the module you specify does not exist; it will simply ignore the
    option.</p>

<p>In addition, it is sometimes necessary to provide the
    <code class="program"><a href="./programs/configure.html">configure</a></code> script with extra information about the
    location of your compiler, libraries, or header files.  This is
    done by passing either environment variables or command line
    options to <code class="program"><a href="./programs/configure.html">configure</a></code>.  For more information, see the
    <code class="program"><a href="./programs/configure.html">configure</a></code> manual page. Or invoke
    <code class="program"><a href="./programs/configure.html">configure</a></code> using the <code>--help</code> option.</p>

<p>For a short impression of what possibilities you have, here
    is a typical example which compiles Apache for the installation
    tree <code>/sw/pkg/apache</code> with a particular compiler and flags
    plus the two additional modules <code class="module"><a href="./mod/mod_ldap.html">mod_ldap</a></code> and
    <code class="module"><a href="./mod/mod_lua.html">mod_lua</a></code>:</p>

<div class="example"><p><code>
      $ CC="pgcc" CFLAGS="-O2" \<br />
       ./configure --prefix=/sw/pkg/apache \<br />
       --enable-ldap=shared \<br />
       --enable-lua=shared
</code></p></div>

<p>When <code class="program"><a href="./programs/configure.html">configure</a></code> is run it will take several minutes to
    test for the availability of features on your system and build
    Makefiles which will later be used to compile the server.</p>

<p>Details on all the different <code class="program"><a href="./programs/configure.html">configure</a></code> options are
    available on the <code class="program"><a href="./programs/configure.html">configure</a></code> manual page.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="compile" id="compile">Build</a></h2>

<p>Now you can build the various parts which form the Apache
    package by simply running the command:</p>

<p>Please be patient here, since a base configuration takes
    several minutes to compile and the time will vary widely
    depending on your hardware and the number of modules that you
    have enabled.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="install" id="install">Install</a></h2>

<p>Now it's time to install the package under the configured
    installation <em>PREFIX</em> (see <code>--prefix</code> option
    above) by running:</p>

<div class="example"><p><code>$ make install</code></p></div>

<p>This step will typically require root privileges, since
    <em>PREFIX</em> is usually a directory with restricted write
    permissions.</p>

<p>If you are upgrading, the installation will not overwrite
    your configuration files or documents.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="customize" id="customize">Customize</a></h2>

<p>Next, you can customize your Apache HTTP server by editing
    the <a href="configuring.html">configuration files</a> under
    <code><em>PREFIX</em>/conf/</code>.</p>

<div class="example"><p><code>$ vi <em>PREFIX</em>/conf/httpd.conf</code></p></div>

<p>Have a look at the Apache manual under
    <code><em>PREFIX</em>/docs/manual/</code> or consult <a href="http://httpd.apache.org/docs/trunk/">http://httpd.apache.org/docs/trunk/</a> for the most recent
    version of this manual and a complete reference of available <a href="mod/directives.html">configuration directives</a>.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="test" id="test">Test</a></h2>

<p>Now you can <a href="invoking.html">start</a> your Apache
    HTTP server by immediately running:</p>

<div class="example"><p><code>$ <em>PREFIX</em>/bin/apachectl -k start</code></p></div>

<p>You should then be able to request your first document
    via the URL <code>http://localhost/</code>. The web page you see is located
    under the <code class="directive"><a href="./mod/core.html#documentroot">DocumentRoot</a></code>,
    which will usually be <code><em>PREFIX</em>/htdocs/</code>.
    Then <a href="stopping.html">stop</a> the server again by
    running:</p>

<div class="example"><p><code>$ <em>PREFIX</em>/bin/apachectl -k stop</code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="upgrading" id="upgrading">Upgrading</a></h2>

<p>The first step in upgrading is to read the release announcement
    and the file <code>CHANGES</code> in the source distribution to
    find any changes that may affect your site.  When changing between
    major releases (for example, from 2.0 to 2.2 or from 2.2 to 2.4),
    there will likely be major differences in the compile-time and
    run-time configuration that will require manual adjustments.  All
    modules will also need to be upgraded to accommodate changes in the
    module API.</p>

<p>Upgrading from one minor version to the next (for example, from
    2.2.55 to 2.2.57) is easier.  The <code>make install</code>
    process will not overwrite any of your existing documents, log
    files, or configuration files.  In addition, the developers make
    every effort to avoid incompatible changes in the
    <code class="program"><a href="./programs/configure.html">configure</a></code> options, run-time configuration, or the
    module API between minor versions.  In most cases you should be able to
    use an identical <code class="program"><a href="./programs/configure.html">configure</a></code> command line, an identical
    configuration file, and all of your modules should continue to
    work.</p>

<p>To upgrade across minor versions, start by finding the file
    <code>config.nice</code> in the <code>build</code> directory of
    your installed server or at the root of the source tree for your
    old install.  This will contain the exact
    <code class="program"><a href="./programs/configure.html">configure</a></code> command line that you used to
    configure the source tree.  Then to upgrade from one version to
    the next, you need only copy the <code>config.nice</code> file to
    the source tree of the new version, edit it to make any desired
    changes, and then run:</p>

<div class="example"><p><code>
    $ ./config.nice<br />
    $ make<br />
    $ make install<br />
    $ <em>PREFIX</em>/bin/apachectl -k graceful-stop<br />
    $ <em>PREFIX</em>/bin/apachectl -k start<br />
    </code></p></div>

<div class="warning">You should always test any new version in your
    environment before putting it into production.  For example, you
    can install and run the new version along side the old one by
    using a different <code>--prefix</code> and a
    different port (by adjusting the <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code> directive) to test for any
    incompatibilities before doing the final upgrade.</div>

<p>You can pass additional arguments to <code>config.nice</code>,
    which will be appended to your original <code class="program"><a href="./programs/configure.html">configure</a></code>
    options:</p>

<div class="example"><p><code>
    $ ./config.nice --prefix=/home/test/apache --with-port=90
    </code></p></div>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="thirdp" id="thirdp">Third-party packages</a></h2>

<p>A large number of third parties provide their own packaged
    distributions of the Apache HTTP Server for installation on
    particular platforms. This includes the various Linux distributions,
    various third-party Windows packages, Mac OS X, Solaris, and many
    more.</p>

<p>Our software license not only permits, but encourages, this kind
    of redistribution. However, it does result in a situation where the
    configuration layout and defaults on your installation of the server
    may differ from what is stated in the documentation. While
    unfortunate, this situation is not likely to change any time
    soon.</p>

<p>A <a href="http://wiki.apache.org/httpd/DistrosDefaultLayout">description
    of these third-party distrubutions</a> is maintained in the HTTP
    Server wiki, and should reflect the current state of these
    third-party distributions. However, you will need to familiarize
    yourself with your particular platform's package management and
    installation procedures.</p>

</div></div>
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