[dns-operations] DNS load-balancing/failover using an ASR 9xxx (few questions)
dns-operations at ml.karotte.org
Wed Aug 20 08:07:37 UTC 2014
* Anand Buddhdev <anandb at ripe.net> [2014-08-15 09:39]:
> > BGP sessions between the ASR 9xxxx and each DNS server in the cluster,
> > ExaBGP running on them announcing their loopback/service /32 + /128
> > address(es).
> > Health check scripts on each service to probe for service ability,
> > retract the announcement upon failure.
> We are doing this exact same thing on many RIPE NCC DNS servers, and it
> works very well. The other advantage of BGP is that as soon as you
> withdraw the announcement, the router stops sending traffic to the
> server. With OSPF, you have timeouts of several seconds before traffic
> stops arriving at a dead server.
Can you share a bit more about the setup/tools RIPE uses for this? I
want to do something like this but I'm still looking for good
recommendations for heartbeat/keepalive tools that watch the DNS
daemon and update ExaBGP accordingly.
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