On 01/03/12 03:40, Beavis wrote:
Just want to piggy back on this topic is there any documentation
available online that shows a deployment guideline for Anycast?
There's not much to it:
1. Create the anycast IP on your servers
2. Route the anycast IP to your servers
3. Make bind listen on the anycast IP
1 & 3 are easy.
2 can be accomplished using a very wide variety of methods. We use BGP,
with a locally-created BGP speaker that checks port 53 for a reply and
advertises/withdraws the route dynamically, but exabgp would be my
recommendation, since it has a built-in facility to announce/withdraw
routes via a "watchdog" script - see pages 5 & 6 of:
http://thomas.mangin.com/data/pdf/Linx%2074%20-%20Mangin%20-%20BGP.pdf
Alternatively you could use OSPF with Zebra/Quagga/Whatever. For example:
http://www.digriz.org.uk/ha-ospf-anycast
Cisco IP SLA probes, with "track" static routes are another option.
Or, if you don't care about dynamically withdrawing the route when bind
goes away, just plain static routes.
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