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...
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
> -----Original Message-----
> From: Vasiliy Boulytchev
> Sent: Wed 6/12/2002 1:26 PM
> To: comp-protocols-dns-bind at isc.org
> 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
> Vasiliy Boulytchev
> Colorado Information Technologies Inc.
> -- Binary/unsupported file stripped by Ecartis --
> -- Type: application/ms-tnef
> -- File: winmail.dat
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