I customized my apache httpd.conf after installing RH6.2 to service my users and to provide virtual hosting capabilities based on directory. During upgrade using the boxed RH7.0 workstation distribution, the customized httpd.conf was overwritten by a "vanilla" version which rendered the serviced site inoperative. Apache installs over an existing apache installation should preserve the contents of user-writable configuration files either by merging or renaming.
Sorry, found http.conf.rpmsave; rpm does what I desired.