The Apache HTTP Server is a robust, commercial-grade open source Web server developed
by the Apache Software Foundation (http://www.apache.org/). Red Hat Enterprise Linux
includes the Apache HTTP Server 2.0 as well as a number of server modules
designed to enhance its functionality.
The default configuration file installed with the Apache HTTP Server works without
alteration for most situations. This chapter outlines many of the
directives found within its configuration file
(/etc/httpd/conf/httpd.conf) to aid those who require
a custom configuration or need to convert a configuration file from the
older Apache HTTP Server 1.3 format.
If using the graphical HTTP Configuration Tool
(system-config-httpd), do not
hand edit the Apache HTTP Server's configuration file as the
HTTP Configuration Tool regenerates this file whenever
it is used.
For more information about the HTTP Configuration Tool,
please refer to the chapter titled Apache HTTP Server
Configuration in the Red Hat Enterprise Linux System Administration Guide.
There are important differences between the Apache HTTP Server 2.0 and
version 1.3 (version 1.3 shipped with Red Hat Enterprise Linux 2.1 and earlier). This
section reviews some of the features of Apache HTTP Server 2.0 and outlines
important changes. For instructions on migrating a version 1.3
configuration file to the 2.0 format, refer to Section 10.2 Migrating Apache HTTP Server 1.3 Configuration Files.
Starting with Red Hat Enterprise Linux 3, the Apache HTTP Server packages were renamed. Also,
some related packages were renamed, deprecated, or incorporated into
Below is a list of packaging changes:
apache-manual packages were renamed to
httpd, httpd-devel and
The mod_dav package was incorporated into
the httpd package.
The mod_put and
mod_roaming packages were removed, since
their functionality is a subset of that provided by
mod_dav (which is now incorporated into the
The mod_auth_any and
mod_bandwidth packages were removed.
The version number for the mod_ssl
package is now synchronized with the
httpd package. This means that the
mod_ssl package for Apache HTTP Server 2.0 has a
lower version number than
mod_ssl package for Apache HTTP Server 1.3.
The following changes to the file system layout occur when upgrading to
Apache HTTP Server 2.0:
The configuration directory,
/etc/httpd/conf.d/, has been
added. — This directory is used to store
configuration files for individually packaged modules, such as
mod_ssl, mod_perl, and
php. The server is instructed to load
configuration files from this location by the directive
Include conf.d/*.conf within the Apache HTTP Server
It is vital that the line specifying the new configuration
directory be inserted when migrating an existing configuration.
The ab and
logresolve programs have been
moved. — These utility programs have been moved
from the /usr/sbin/ directory and into
the /usr/bin/ directory. This causes
scripts with absolute paths for these binaries to fail.