Re: [NANOG] Did Youtube not pay their domain bill?

[Deepak Jain <deepak () ai net>]

> note that joe's example brings up the interface before starting the name
> server program, and bringing it down if the name server program exits.
> this presumes that the name server will start very quickly, and that while
> running, it is healthy.  since i've seen name server programs be unhealthy
> while running, and/or take a long time to start, i'm now considering an
> outboard shell script that runs some kind of DNS query and decides, based
> on the result, whether to bring the dedicated loopback interface up or down.

All deference to this model, we've all seen these kinds of problems with 
name servers. We *can* be certain that bringing a loopback interface up 
or down takes almost no time (with the implied effect to a speaker like 
Quagga). There is *no* reason with a sufficiently deep name server depth 
  (depends on your load) that your monitoring script should *need* to 
hurry to test this condition. Every 5-10 or even 15 minutes to see if 
its eligible to bring up, more frequently to see if its eligible to take 
down. This also reduces oscillation.

This means, bring up/kill off your name server in one cronjob 
(automatically taking the interface down at the end or after a kill), 
and monitor/talk to the interface in another (up function and sometimes 
the down).

You'll be much happier.

Deepak Jain
AiNET

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