Mirrored servers in data centers nationwide -- how?
- by Sysadmin Evstar
I flubbed my IT interview with Google by getting this question wrong. I thought that in the various metropolitan areas, an "http://google.com" request went to a local DNS server in a geographically nearby datacenter, which then returned an IP address for just one of several nearby http servers, which then rollover'd to the next local server, and I could not explain how or where the nationwide DNS kept its table of the available local servers cached, or how such a rollover happened. Or how they could manually take some server out of rotation, from anywhere. Fail. So, which Wikipedia page should I be looking at now so I can ace this question next time? And, what daemons run on these machines 24/7 to keep the mirrored database disks synchronized?