[NTLUG:Discuss] "Web site temporarily offline"

[Daniel Hauck]

I have my main web stuff on a VM and occasionally, I like to run backups
of the VM but it takes at least 20 minutes.  During that down time, I
would like to have another machine detect when the server is down and
assume the server's IP address so that it can say "Web site down for
maintenance.  Be back soon!"

I imagine running a small VM that would run whatever processes needed.

Anyone know any magic tricks to accomplish this?