RoundRobin DNS?
Kevin Darcy
kcd at daimlerchrysler.com
Wed Jun 12 22:21:31 UTC 2002
Big deal. You could have a cron job do "health checks" and change the A
record via Dynamic Update.
The real issue here is that short TTLs are anti-social. That's why
responsible architects/admins don't implement such scripts. Unfortunately,
this reticence has opened up the door to a bunch of hucksters overcharging
for their "WSD" devices (or GSLB, or whatever the nom-de-jour happens to
be). I was hoping the dot-bomb phenomenon would have wiped out all of those
hucksters, but apparently even the big networking companies have jumped on
this bandwagon, so it's unlikely to die anytime soon. Sigh...
- Kevin
Dj Rocket wrote:
> Sorry, my response is not BIND oriented, but I believe the answer to
> your question is WSD's (web service directors). This is what they do at
> sites like yahoo. If your client is big enough, you might consider
> doing the same. It not only does the load balancing for your web
> servers, but it also does health checks. If the web server goes down,
> the WSD will not give out that ip address to the client. Also, it
> doesn't do "blind" or random round-robin, it provides real load
> balancing. Your DNS server would have an NS record pointing to the WSD.
> The WSD would have a bunch of A records pointing to the real
> servers........
>
> -----Original Message-----
> From: Vasiliy Boulytchev
> Sent: Wed 6/12/2002 1:26 PM
> To: comp-protocols-dns-bind at isc.org
> Cc:
> Subject: RoundRobin DNS?
>
>
>
> Ladies and Gents,
> This is a first time I get a client big enough that needs
> this solution. Imagine a scenario, that you have a web server that
> can't go down. So you put it up at 2 different locations, say one in
> LA, other in NYC. So if say the ISP in LA goes down, NYC should
> theoretically start getting requests for webhits. That's what this
> client wants. So how is this done, I'm not sure this is done with DNS
> at all, although its a possibility. When I querry yahoo.com with
> nslookup, I get a few different ips. HOW IS THIS DONE? Can someone
> please point me in the right direction?
>
>
>
> THANKS A BUNCH
>
>
> Regards,
> Vasiliy Boulytchev
> Colorado Information Technologies Inc.
>
>
>
>
> -- Binary/unsupported file stripped by Ecartis --
> -- Type: application/ms-tnef
> -- File: winmail.dat
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