p.mayers at imperial.ac.uk
Thu Mar 1 11:26:11 UTC 2012
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:
Alternatively you could use OSPF with Zebra/Quagga/Whatever. For example:
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.
More information about the bind-users