On 3/1/2011 6:30 PM, Mark Andrews wrote:
In message<4d6d7268.1080...@chrysler.com>, Kevin Darcy writes:
I got a trouble ticket on this too.
From the looks of things, Cisco is using GSSes to load-balance this
site. GSSes return SERVFAIL if all of the resources behind the
load-balancer are down (which it determines via a heartbeat mechanism).
So I think this is a "simple" case of a website (or cluster) going down.
It was down earlier today, then up again, as of this writing, it is down
again.
DNS doesn't really have a response code of "requested resource not
available", so SERVFAIL is Cisco's closest approximation. It has the
drawback, however, of often making other sorts of problems appear to be
DNS problems. That's just a cross that we DNS admins have to bear...
- Kevin
Then the load balancer should return default records or 0.0.0.0/:: to
indicate the name is good but doesn't currently have a address.
I like that solution, actually. Even if the client doesn't recognize it
as a "special" address, hopefully if it tries to connect to it, the
packet won't make it past the first router or switch hop...
Has anyone proposed this to the load-balancer vendors?
- Kevin
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