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|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
This file is generated from xml source: DO NOT EDIT
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-->
<title>Compiling and Installing - Apache HTTP Server</title>
<link href="./style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
<link href="./style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
<link href="./style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
<link href="./images/favicon.ico" rel="shortcut icon" /></head>
<body id="manual-page"><div id="page-header">
<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.1</p>
<img alt="" src="./images/feather.gif" /></div>
<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
<div id="path">
<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs-project/">Documentation</a> > <a href="./">Version 2.1</a></div><div id="page-content"><div id="preamble"><h1>Compiling and Installing</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="./de/install.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> |
<a href="./en/install.html" title="English"> en </a> |
<a href="./ja/install.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
<a href="./ko/install.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div>
<p>This document covers compilation and installation of Apache
on Unix and Unix-like systems only. For compiling and
installation on Windows, see <a href="platform/windows.html">Using Apache with Microsoft
Windows</a>. For other platforms, see the <a href="platform/">platform</a> documentation.</p>
<p>Apache 2.0's configuration and installation environment has
changed completely from Apache 1.3. Apache 1.3 used a custom
set of scripts to achieve easy installation. Apache 2.0 now
uses <code>libtool</code> and <code>autoconf</code>
to create an environment that looks like many other Open Source
projects.</p>
<p>If you are upgrading from one minor version to the next (for
example, 2.0.50 to 2.0.51), 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>
</ul><h3>See also</h3><ul class="seealso"><li><a href="invoking.html">Starting Apache</a></li><li><a href="stopping.html">Stopping and Restarting</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-2_1_<em>NN</em>.tar.gz<br />
$ tar xvf httpd-2_1_<em>NN</em>.tar</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>
<td><code>$ make</code> </td>
</tr>
<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>
<tr>
<td><a href="#test">Test</a></td>
<td><code>$ <em>PREFIX</em>/bin/apachectl start</code>
</td>
</tr>
</table>
<p><em>NN</em> must be replaced with the current minor 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:</p>
<dl>
<dt>Disk Space</dt>
<dd>Make sure you have at least 50 MB of temporary free disk
space available. After installation Apache occupies
approximately 10 MB of disk space. The actual disk space
requirements will vary considerably based on your chosen
configuration options and any third-party modules.</dd>
<dt>ANSI-C Compiler and Build System</dt>
<dd>Make sure you have an ANSI-C compiler installed. The <a href="http://www.gnu.org/software/gcc/gcc.html">GNU C
compiler (GCC)</a> from the <a href="http://www.gnu.org/">Free Software Foundation (FSF)</a>
is recommended (version 2.7.2 is fine). 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 Usenet newsgroup <a href="news:comp.protocols.time.ntp">comp.protocols.time.ntp</a>
and 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 <a href="programs/apxs.html">apxs</a> or <a href="programs/dbmmanage.html">dbmmanage</a> (which are
written in Perl) the Perl 5 interpreter is required (versions
5.003 or newer are sufficient). If no such interpreter is found by
the `<code>configure</code>' script there is no harm. Of course, you
still can build and install Apache 2.0. Only those support scripts
cannot be used. If you have multiple Perl interpreters
installed (perhaps a Perl 4 from the vendor and a Perl 5 from
your own), then it is recommended to use the <code>--with-perl</code>
option (see below) to make sure the correct one is selected
by <code>./configure</code>.</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>Apache can be downloaded from the <a href="http://httpd.apache.org/download.cgi">Apache HTTP Server
download site</a> which lists several mirrors. You'll find here
the latest stable release.</p>
<p>After downloading, especially if a mirror site is used, 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. This,
in turn, is a two step procedure. First, you must obtain the
<a href="http://www.apache.org/dist/httpd/KEYS"><code>KEYS</code></a>
file from the Apache distribution site, too. (To assure that the
<code>KEYS</code> file itself has not been modified, it may be a good
idea to use a file from a previous distribution of Apache or import
the keys from a public key server.) The keys are imported into
your personal key ring using one of the following commands (depending
on your pgp version):</p>
<div class="example"><p><code>$ pgp < KEYS</code></p></div>
<p>or </p>
<div class="example"><p><code>$ gpg --import KEYS</code></p></div>
<p>The next step is to test the tarball against the PGP
signature, which should always be obtained from the <a href="http://httpd.apache.org/download.cgi">main Apache
website</a>. A link to the signature file is placed behind the
corresponding download link or may be found in the particular
directory at the <a href="http://www.apache.org/dist/httpd/">Apache
distribution site</a>. Its filename is identical to the source
tarball with the addition of <code>.asc</code>. Then you can check
the distribution with one of the following commands (again,
depending on your pgp version):</p>
<div class="example"><p><code>$ pgp httpd-2_1_<em>NN</em>.tar.gz.asc</code></p></div>
<p>or</p>
<div class="example"><p><code>$ gpg --verify httpd-2_1_<em>NN</em>.tar.gz.asc</code></p></div>
<p>You should receive a message like</p>
<div class="example"><p><code>Good signature from user "Martin Kraemer
<martin@apache.org>".</code></p></div>
<p>Depending on the trust relationships contained in your key
ring, you may also receive a message saying that the
relationship between the key and the signer of the key cannot
be verified. This is not a problem if you trust the
authenticity of the <code>KEYS</code> file.</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 HTTPD tarball is a
simple matter of uncompressing, and then untarring:</p>
<div class="example"><p><code>
$ gzip -d httpd-2_1_<em>NN</em>.tar.gz<br />
$ tar xvf httpd-2_1_<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>configure</code> included in the
root directory of the distribution. (Developers downloading the
CVS 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>configure</code> accepts a variety of variables
and command line options. Environment variables are generally
placed before the <code>./configure</code> command, while other
options are placed after. The most important option here is the
location prefix where Apache is to be installed later, because
Apache has to be configured for this location to work
correctly. But there are a lot of other options available for
your pleasure.</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_rewrite.html">mod_rewrite</a></code> and
<code class="module"><a href="./mod/mod_speling.html">mod_speling</a></code> for
later loading through the DSO mechanism:</p>
<div class="example"><p><code>
$ CC="pgcc" CFLAGS="-O2" \<br />
./configure --prefix=/sw/pkg/apache \<br />
--enable-rewrite=shared \<br />
--enable-speling=shared
</code></p></div>
<p>When <code>configure</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>The easiest way to find all of the configuration flags for
Apache is to run <code>./configure --help</code>. What follows is a
brief description of most of the arguments and environment
variables.</p>
<h3><a name="environment" id="environment">Environment Variables</a></h3>
<p>The <code>autoconf</code> build process uses several environment
variables to configure the build environment. In general, these
variables change the method used to build Apache, but not the
eventual features of the server. These variables can be placed
in the environment before invoking <code>configure</code>, but
it is usually easier to specify them on the
<code>configure</code> command line as demonstrated in the
example above.</p>
<dl>
<dt><code>CC=...</code></dt>
<dd>The name of the C compiler command.</dd>
<dt><code>CPPFLAGS=...</code></dt>
<dd>Miscellaneous C preprocessor and compiler options.</dd>
<dt><code>CFLAGS=...</code></dt>
<dd>Debugging and optimization options for the C
compiler.</dd>
<dt><code>LDFLAGS=...</code></dt>
<dd>Miscellaneous options to be passed to the linker.</dd>
<dt><code>LIBS=...</code></dt>
<dd>Library location information ("<code>-L</code>" and
"<code>-l</code>" options) to pass to the linker.</dd>
<dt><code>INCLUDES=...</code></dt>
<dd>Header file search directories ("<code>-I<em>dir</em></code>").</dd>
<dt><code>TARGET=...</code> [Default: <code>httpd</code>]</dt>
<dd>Name of the executable which will be built.</dd>
<dt><code>NOTEST_CPPFLAGS=...</code></dt>
<dt><code>NOTEST_CFLAGS=...</code></dt>
<dt><code>NOTEST_LDFLAGS=...</code></dt>
<dt><code>NOTEST_LIBS=...</code></dt>
<dd>These variables share the same function as their
non-<code>NOTEST</code> namesakes. However, the variables are
applied to the build process only after autoconf has performed its
feature testing. This allows the inclusion of flags which
will cause problems during feature testing, but must be used
for the final compilation.</dd>
<dt><code>SHLIB_PATH=...</code></dt>
<dd>Options which specify shared library paths for the
compiler and linker.</dd>
</dl>
<h3><a name="output" id="output">autoconf Output Options</a></h3>
<dl>
<dt><code>--help</code></dt>
<dd>Prints the usage message including all available options,
but does not actually configure anything.</dd>
<dt><code>--quiet</code></dt>
<dd>Prevents the printing of the usual "<code>checking...</code>"
messages.</dd>
<dt><code>--verbose</code></dt>
<dd>Prints much more information during the configuration
process, including the names of all the files examined.</dd>
</dl>
<h3><a name="pathnames" id="pathnames">Pathnames</a></h3>
<p>There are currently two ways to configure the pathnames
under which Apache will install its files. First, you can
specify a directory and have Apache install itself under that
directory in its default locations.</p>
<dl>
<dt><code>--prefix=<em>PREFIX</em></code> [Default:
<code>/usr/local/apache2</code>]</dt>
<dd>Specifies the directory under which the Apache files will
be installed.</dd>
</dl>
<p>It is possible to specify that architecture-dependent files
should be placed under a different directory.</p>
<dl>
<dt><code>--exec-prefix=<em>EPREFIX</em></code> [Default:
<code><em>PREFIX</em></code>]</dt>
<dd>Specifies the directory under which
architecture-dependent files will be placed.</dd>
</dl>
<p>The second, and more flexible way to configure the install
path locations for Apache is using the
<code>config.layout</code> file. Using this method, it is
possible to separately specify the location for each type of
file within the Apache installation. The
<code>config.layout</code> file contains several example
configurations, and you can also create your own custom
configuration following the examples. The different layouts in
this file are grouped into <code><Layout
FOO>...</Layout></code> sections and referred to by
name as in <code>FOO</code>.</p>
<dl>
<dt><code>--enable-layout=<em>LAYOUT</em></code></dt>
<dd>Use the named layout in the <code>config.layout</code>
file to specify the installation paths.</dd>
</dl>
<h3><a name="modules" id="modules">Modules</a></h3>
<p>Apache is a modular server. Only the most basic
functionality is included in the core server. Extended features
are available in various modules. During the configuration
process, you must select which modules to compile for use with
your server. You can view a <a href="mod/">list of modules</a> included in
the documentation. Those modules with a <a href="mod/module-dict.html#Status">status</a> of "Base" are
included by default and must be specifically disabled if you do
not want them (e.g. <code class="module"><a href="./mod/mod_userdir.html">mod_userdir</a></code>). Modules with any
other status must be specifically enabled if you wish to use them
(e.g. <code class="module"><a href="./mod/mod_expires.html">mod_expires</a></code>).</p>
<p>There are two ways for a module to be compiled and used with
Apache. Modules may be <em>statically compiled</em>, which
means that they are permanently included in the Apache binary.
Alternatively, if your operating system supports Dynamic Shared
Objects (DSOs) and <code>autoconf</code> can detect that support, then
modules may be <em>dynamically compiled</em>. DSO modules are
stored separately from the Apache binary, and may be included
or excluded from the server using the run-time configuration
directives provided by <code class="module"><a href="./mod/mod_so.html">mod_so</a></code>.
The mod_so is automatically included in the server if any
dynamic modules are included in the compilation. If you would
like to make your server capable of loading DSOs without
actually compiling any dynamic modules, you can explicitly
<code>--enable-so</code>.</p>
<dl>
<dt><code>--enable-<em>MODULE</em>[=shared]</code></dt>
<dd>Compile and include the module <em>MODULE</em>. The
identifier <em>MODULE</em> is the <a href="mod/module-dict.html#ModuleIdentifier">Module
Identifier</a> from the module documentation without the
"_module" string. To compile the module as a DSO, add the
option <code>=shared</code>.</dd>
<dt><code>--disable-<em>MODULE</em></code></dt>
<dd>Remove the module <em>MODULE</em> which would otherwise
be compiled and included.</dd>
<dt><code>--enable-modules=<em>MODULE-LIST</em></code></dt>
<dd>Compile and include the modules listed in the
space-separated <em>MODULE-LIST</em>.</dd>
<dt>
<code>--enable-mods-shared=<em>MODULE-LIST</em></code></dt>
<dd>Compile and include the modules in the space-separated
<em>MODULE-LIST</em> as dynamically loadable (DSO)
modules.</dd>
</dl>
<p>The <em>MODULE-LIST</em> in the
<code>--enable-modules</code> and
<code>--enable-mods-shared</code> options is usually a
space-separated list of module identifiers. For example, to
enable <code class="module"><a href="./mod/mod_dav.html">mod_dav</a></code> and <code class="module"><a href="./mod/mod_info.html">mod_info</a></code>,
you can either use</p>
<div class="example"><p><code>./configure --enable-dav --enable-info</code></p></div>
<p>or, equivalently,</p>
<div class="example"><p><code>./configure --enable-modules="dav info"</code></p></div>
<p>In addition, the special keywords <code>all</code> or
<code>most</code> can be used to add all or most of the modules
in one step. You can then remove any modules that you do not
want with the <code>--disable-<em>MODULE</em></code> option.
For example, to include all modules as DSOs with the exception
of <code class="module"><a href="./mod/mod_info.html">mod_info</a></code>, you can use</p>
<div class="example"><p><code>
./configure --enable-mods-shared=all
--disable-info
</code></p></div>
<p>In addition to the standard set of modules, Apache 2.0 also
includes a choice of <a href="mpm.html">Multi-Processing
Modules</a> (MPMs). One, and only one MPM must be included in
the compilation process. The default MPMs for each platform are
listed on the <a href="mpm.html">MPM documentation page</a>,
but can be overridden on the <code>configure</code> command
line.</p>
<dl>
<dt><code>--with-mpm=<em>NAME</em></code></dt>
<dd>Choose the mpm <em>NAME</em>.</dd>
</dl>
<p>To activate an MPM called <var>mpm_name</var>, you can use</p>
<div class="example"><p><code>
./configure --with-mpm=<var>mpm_name</var>
</code></p></div>
<h3><a name="dbm" id="dbm">DBM</a></h3>
<p>Several Apache features, including
<code class="module"><a href="./mod/mod_authn_dbm.html">mod_authn_dbm</a></code> and <code class="module"><a href="./mod/mod_rewrite.html">mod_rewrite</a></code>'s
DBM <code class="directive"><a href="./mod/mod_rewrite.html#rewritemap">RewriteMap</a></code> use
simple key/value databases for quick lookups of information. Apache
includes SDBM with its source-code, so this database is always
available. If you would like to use other database types, the
following <code>configure</code> options are available:</p>
<dl>
<dt><code>--with-gdbm[=<em>path</em>]</code></dt>
<dt><code>--with-ndbm[=<em>path</em>]</code></dt>
<dt><code>--with-berkeley-db[=<em>path</em>]</code></dt>
<dd>If no <em>path</em> is specified, Apache will search for the
include files and libraries in the usual search paths. An explicit
<em>path</em> will cause Apache to look in
<em>path</em><code>/lib</code> and
<em>path</em><code>/include</code> for the relevant files. Finally,
the <em>path</em> may specify specific include and library paths
separated by a colon.</dd>
</dl>
<h3><a name="suexec" id="suexec">Suexec</a></h3>
<p>Apache includes a support program called <a href="suexec.html">suexec</a> which can be used to isolate user
CGI programs. However, if suexec is improperly configured, it
can cause serious security problems. Therefore, you should
carefully read and consider the <a href="suexec.html">suexec
documentation</a> before implementing this feature.</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>
<div class="example"><p><code>$ make</code></p></div>
<p>Please be patient here, since a base configuration takes
approximately 3 minutes to compile under a Pentium III/Linux
2.2 system, but this will vary widely depending on your
hardware and the number of modules which 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>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 <a href="./">docs/manual/</a> or consult <a href="http://httpd.apache.org/docs-2.1/">http://httpd.apache.org/docs-2.1/</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 start</code></p></div>
<p>and then you should be able to request your first document
via 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 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 1.3 to 2.0 or from 2.0 to 2.2),
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 accomodate changes in the
module API.</p>
<p>Upgrading from one minor version to the next (for example, from
2.0.55 to 2.0.57) 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>configure</code> options, run-time configuration, or the
module API between minor versions. In most cases you should be able to
use an identical <code>configure</code> command line, an identical
configuration file, and all of your modules should continue to
work. (This is only valid for versions after 2.0.41; earlier
versions have incompatible changes.)</p>
<p>If you kept the source tree from your last installation,
upgrading is even easier. The file <code>config.nice</code> in
the root of the old source tree contains the exact
<code>configure</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 stop<br />
$ <em>PREFIX</em>/bin/apachectl 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>
</div></div>
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