Hi Sean,
We are running production on Red Hat 4, so yeah, it works great.
Documentation can be found on the Wiki, https://openacs.org/xowiki/openacs-system-install there is loads of stuff knocking around there.
In general you need to install all of the required server components, that is aolserver, postgres, tcl, xotcl, etc. Put the openacs/dotLRN stuff in the right directories, setup a virgin database and then browse to the installation page and you should be able to install nicely from there.
Get the latest stable version of Openacs/.LRN from http://dotlrn.org/download/
Hope that helps
Matthew
