For internal outages I've created two scripts on each of the proxy servers.
/etc/httpd/outage/outage.sh
and
/etc/httpd/outage/outage-over.sh
They're pretty self explanatory. Basically though they stop httpd and
start up a special instance. Configs, html and images are all self
contained in /etc/httpd/outage/ so as long as that dir exists and apache
is installed, the outage page should be viewable.
-Mike