The following requirements exist for building Apache HTTPd:
- Disk Space
- 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.
- 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 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
--with-perloption (see below) to make sure the correct one is used by
configure. 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.
- apr/apr-util >= 1.2
apr-utilare bundled with the Apache HTTPd source releases, and will be used without any problems in almost all circumstances. However, if
apr-util, versions 1.0 or 1.1, are installed on your system, you must either upgrade your
apr-utilinstallations to 1.2, force the use of the bundled libraries or have httpd use separate builds. To use the bundled
apr-utilsources specify the
--with-included-aproption to configure:
NoteThe --with-included-apr option was added in version 2.2.3To build Apache HTTPd against a manually installed
# Force the use of the bundled apr/apr-util
# Build and install apr 1.2
# Build and install apr-util 1.2
./configure --prefix=/usr/local/apr-util-httpd/ --with-apr=/usr/local/apr-httpd/
# Configure httpd
./configure --with-apr=/usr/local/apr-httpd/ --with-apr-util=/usr/local/apr-util-httpd/
Extracting the source from the Apache HTTPd 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 HTTPd source tree for your particular platform and personal requirements. This is done using the script
configure included in the root directory of the distribution. (Developers downloading an unreleased version of the Apache HTTPd 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, simply type
./configure. To change the default options,
configure accepts a variety of variables and command line options.
The most important option is the location
--prefix where the Apache HTTP Server is to be installed later, because Apache HTTPd has to be configured for this location to work correctly. More fine-tuned control of the location of files is possible with additional configure options.
Also at this point, you can specify which features you want included in Apache HTTPd by enabling and disabling modules. The Apache HTTP Server comes with a Base set of modules included by default. Other 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. You can also choose to compile modules as shared objects (DSOs) -- which can be loaded or unloaded at runtime -- by using the option
--enable-module=shared. Similarly, you can disable Base 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 option.
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 options to
configure. For more information, see the
configure manual page.
For a short impression of what possibilities you have, here is a typical example which compiles Apache for the installation tree
/sw/pkg/apache with a particular compiler and flags plus the two additional modules
mod_speling for later loading through the DSO mechanism:
$ 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 HTTPd 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
--prefix option above) by running:
$ make install
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 HTTP Server manual under docs/manual/ or consult http://httpd.apache.org/docs/2.2/ 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
and then you should be able to request your first document via URL
http://localhost/. The web page you see is located under the
DocumentRoot, which will usually be
PREFIX/htdocs/. Then stop the server again by running:
$ 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 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.
Upgrading from one minor version to the next (for example, from 2.2.55 to 2.2.57) is easier. The
make install 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 work.
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