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Apache web server has a flexible mechanism for accepting requests and dispatching children to process them which are abstracted in to Multi Processing Modules (MPM). The MPM used by default in Red Hat Enterprise Linux is prefork, which spawns multiple child process when needed just like Apache 1.3. Other MPMs are not yet available; through directives for some appear in the configuration file.

Dynamic module loading allows a dedicated web server administrator to change the behavior of Apache webserver. This can be done without recompiling any source code, and simply specifying the use of a given module. A commonly used module is mod_per1, which is used to increase Perl CGI script execution speed.

More information about Apache HTTP Server is on their website is http://http.apache.org

Service Profile for Apache web server: HTTPD
1. Type: SystemV-managed service
2. Packages:httpd, httpd-devel, httpd-manual
3. Daemon:/usr/sbin/httpd
4. Scripts: /etc/init.d/httpd
5. Ports: 80(http), 43(https)
6. Configuration: /etc/http/*, /var/www/*
7. Related: system-config-httpd, mod_ssl

Apache web server is an SELinux restricted service when enforcing the default targeted policy on a Red Hat Enterprise Linux, version 4 system. The server uses a number of SELinux contexts for its files.

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