Maybe my question is a little bit stupid, but idea is to have a reserve web server, which will be activated WHEN main web server becomes inactive (DDos, or any other incident).
Please name common practices for this solution. Operation system will be freeBSD. Im really interesting in package names, methods how to sync files almost in realtime, with a minimum delay, especially database server because payments and sessions and stuff like that, must stay as it was started on the first server. My first idea is rsync, but this sounds lame for me if you thing about how many stuff needs to be transferred... I even would agree to clone memory stack =))
p.s. even if you guys don't understand what i'm talking about, or I need to be more specific, shoot all your ideas, for various kind of syncing =) Thnx.
Thank you guys, now I have plenty ideas about failovers. I'll probably will use HA Cluster with load-balansing.