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Chapter 14. Apache HTTP Server
14.2.1.2. Server pool Size Regulation
In Apache HTTP Server 2.0, the responsibility for accepting requests and dispatching child processes
to handle them has been abstracted into a group of modules called Multi Processing Modules (MPMs).
Unlike other modules, only one module from the MPM group can be loaded by the Apache HTTP
Server because an MPM module is responsible for basic request handling and dispatching. There are
three MPM modules that ship with version 2.0: prefork, worker, and perchild.
The original Apache HTTP Server 1.3 behavior has been moved into the prefork MPM. Currently
only the prefork MPM is available on Red Hat Linux, although other MPMs may be made available
at some later date.
The MPM supplied by default on Red Hat Linux is prefork which accepts the same directives as
Apache HTTP Server 1.3. The following directives may be migrated directly:
  StartServers
  MinSpareServers
  MaxSpareServers
  MaxClients
  MaxRequestsPerChild
For more on this topic, refer to the following documentation on the Apache Software Foundation's
website:
http://httpd.apache.org/docs 2.0/mpm.html
14.2.1.3. Dynamic Shared Object (DSO) Support
There are many changes required here and it is highly recommended that anyone trying to modify an
Apache 1.3 configuration to suit Apache 2.0 (as opposed to migrating your changes into the Apache
2.0 configuration) copy this section from the stock Red Hat Linux Apache HTTP Server 2.0 configu 
ration file.
Important
If you do decide to try and modify your original file, please note that it is of paramount importance
that your httpd.conf contains the following directive:
Include conf.d/*.conf
Omission of this directive will result in the failure of all modules packaged in their own RPMs (such
as mod_perl, php, and mod_ssl).
Those who still do not want to copy the section from the stock Apache HTTP Server 2.0 configuration
should note the following:
The
AddModule
and
ClearModuleList
directives no longer exist. These directives where used
to ensure that modules could be enabled in the correct order. The Apache 2.0 API allows modules
to specify their ordering, eliminating the need for these two directives.
The order of the
LoadModule
lines is no longer relevant.
Many modules have been added, removed, renamed, split up, or incorporated with each other.






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