On Wed, 1 Sep 2004, Steve Francis wrote:
Christopher L. Morrow wrote:
If I read your original request correctly you were planning on: 1) having presence in multiple datacenters (assume multiple providers as well) 2) having a 'authoritative' DNS server in each facility (or 2/3/4 whatever per center) 3) return datacenter-1-host-1 from datacenter-1-authserver-1, datacenter-2-host-2 from datacenter-2-authserver-1, and so forth.
This isn't really 'anycast' so much as 'different A records depending on server which was asked'
Well, there'd be one NS record returned for the zone in question. That NS record would be an IP address that is anycasted from all the datacenters. So end users (or their DNS servers) would all query the same IP address as the NS for that zone, but would end up at different datacenters depending on the whims of the anycasted BGP space.
Hmm, why not anycast the service/application ips? Having inconsistent DNS info seems like a problem waiting to bite your behind.
I suspect you'd really also introduce some major troubleshooting headaches with this setup, not just for you, but for your users as well.
I don't doubt that. :-)
which I'd think you'd want to minimize as much as possible, right?