I've inherited a CentOS box with Apache running RoR, and I've been all
right with it. I wish I had my admin notes, but I did do a lot of
updating on everything to make sure I was up to snuff. It was all
just standard updates on Apache, Rails, Ruby, and their ilk.
Looking back, I would have gone straight Mongrel just for simplicity's
sake. The server will never have heavy traffic and all the Apache
config definitely seemed like overkill to me. The word I keep hearing
is that a cluster of Mongrel servers run through Apache for the static
content is the fastest way to configure things. I don't know if
that's becoming true because it's repeated so often or if that's
really the way it is. As it stands, those concerns don't come near
anything I'm working on today.
Just my 2 cents.