Compiling and Installing
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 Using Apache HTTP Server with Microsoft Windows and Compiling Apache for Microsoft Windows. For other platforms, see the platform documentation.
Apache httpd uses
to create a build environment that looks like many other Open Source
If you are upgrading from one minor version to the next (for example, 2.4.9 to 2.4.10), please skip down to the upgrading section.
|Download||Download the latest release from http://httpd.apache.org/download.cgi|
NN must be replaced with the current version
number, and PREFIX must be replaced with the
filesystem path under which the server should be installed. If
PREFIX is not specified, it defaults to
Each section of the compilation and installation process is described in more detail below, beginning with the requirements for compiling and installing Apache httpd.
The following requirements exist for building Apache httpd:
- APR and APR-Util
- 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 Apache APR, unpack
/httpd_source_tree_root/srclib/apr-util(be sure the directory names do not have version numbers; for example, the APR distribution must be under /httpd_source_tree_root/srclib/apr/) and use
--with-included-aproption. On some platforms, you may have to install the corresponding
-devpackages to allow httpd to build against your installed copy of APR and APR-Util.
- Perl-Compatible Regular Expressions Library (PCRE)
- This library is required but not longer bundled with httpd.
Download the source code from http://www.pcre.org,
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
--with-pcreparameter. On some platforms, you may have to install the corresponding
-devpackage to allow httpd to build against your installed copy of PCRE.
- Disk Space
- 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.
- ANSI-C Compiler and Build System
- Make sure you have an ANSI-C compiler installed. The GNU C
compiler (GCC) from the Free Software Foundation (FSF)
is recommended. If you don't have GCC
then at least make sure your vendor's compiler is ANSI
compliant. In addition, your
PATHmust contain basic build tools such as
- Accurate time keeping
- 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
xntpdprograms are used for this purpose which are based on the Network Time Protocol (NTP). See the NTP homepage for more details about NTP software and public time servers.
- Perl 5 [OPTIONAL]
- For some of the support scripts like
dbmmanage(which are written in Perl) the Perl 5 interpreter is required (versions 5.003 or newer are sufficient). If no Perl 5 interpreter is found by the
configurescript, you will not be able to use the affected support scripts. Of course, you will still be able to build and use Apache httpd.
The Apache HTTP Server can be downloaded from the Apache HTTP Server
download site, 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
INSTALL.bindist file inside the distribution.
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 download page and an extended example is available describing the use of PGP.
Extracting the source from the Apache HTTP Server tarball is a simple matter of uncompressing, and then untarring:
$ gzip -d httpd-NN.tar.gz
$ tar xvf httpd-NN.tar
This will create a new directory under the current directory
containing the source code for the distribution. You should
cd into that directory before proceeding with
compiling the server.
The next step is to configure the Apache source tree for your
particular platform and personal requirements. This is done using
configure included in
the root directory of the distribution. (Developers downloading
an unreleased version of the Apache source tree will need to have
libtool installed and will
need to run
buildconf before proceeding with the next
steps. This is not necessary for official releases.)
To configure the source tree using all the default options,
./configure. To change the default
configure accepts a variety of variables
and command line options.
The most important option is the location
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 configure
Also at this point, you can specify which features you
want included in Apache by enabling and disabling modules. Apache comes with a wide range of modules
included by default. They will be compiled as
shared objects (DSOs) which can be loaded
or unloaded at runtime.
You can also choose to compile modules statically by using the option
Additional modules are enabled using the
--enable-module option, where
module is the name of the module with the
mod_ string removed and with any underscore converted
to a dash. Similarly, you can disable modules with the
--disable-module option. Be careful when
using these options, since
configure cannot warn you
if the module you specify does not exist; it will simply ignore the
In addition, it is sometimes necessary to provide the
configure 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
configure. For more information, see the
configure manual page. Or invoke
configure using the
For a short impression of what possibilities you have, here
is a typical example which compiles Apache for the installation
/sw/pkg/apache with a particular compiler and flags
plus the two additional modules
$ CC="pgcc" CFLAGS="-O2" \
./configure --prefix=/sw/pkg/apache \
configure 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.
Now you can build the various parts which form the Apache package by simply running the command:
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.
Now it's time to install the package under the configured
installation PREFIX (see
above) by running:
$ make install
This step will typically require root privileges, since PREFIX is usually a directory with restricted write permissions.
If you are upgrading, the installation will not overwrite your configuration files or documents.
Next, you can customize your Apache HTTP server by editing
the configuration files under
$ vi PREFIX/conf/httpd.conf
Have a look at the Apache manual under
PREFIX/docs/manual/ or consult http://httpd.apache.org/docs/2.4/ for the most recent
version of this manual and a complete reference of available configuration directives.
Now you can start your Apache HTTP server by immediately running:
$ PREFIX/bin/apachectl -k start
You should then be able to request your first document
via the URL
http://localhost/. The web page you see is located
which will usually be
Then stop the server again by
$ PREFIX/bin/apachectl -k stop
The first step in upgrading is to read the release announcement
and the file
CHANGES 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
Upgrading from one minor version to the next (for example, from
2.2.55 to 2.2.57) is easier. The
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
configure options, run-time configuration, or the
module API between minor versions. In most cases you should be able to
use an identical
configure command line, an identical
configuration file, and all of your modules should continue to
To upgrade across minor versions, start by finding the file
config.nice in the
build directory of
your installed server or at the root of the source tree for your
old install. This will contain the exact
configure command line that you used to
configure the source tree. Then to upgrade from one version to
the next, you need only copy the
config.nice file to
the source tree of the new version, edit it to make any desired
changes, and then run:
$ make install
$ PREFIX/bin/apachectl -k graceful-stop
$ PREFIX/bin/apachectl -k start
--prefixand a different port (by adjusting the
Listendirective) to test for any incompatibilities before doing the final upgrade.
You can pass additional arguments to
which will be appended to your original
$ ./config.nice --prefix=/home/test/apache --with-port=90
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.
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.
A description of these third-party distrubutions 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.