How Zone Files Are Read

[Tim Daneliuk]

On 12/16/20 11:36 AM, Reindl Harald wrote:
> 
> 
> Am 16.12.20 um 18:26 schrieb Gregory Sloop:
>> This isn't, IMO, very useful as a response to the OP.
> 
> let that decide the OP
> 
>> To sum up the response; "It's better to never fail!"
>>
>> Yes, that seems pretty obvious. It *would* be better to never fail. Way, way better.
>> But the big problem in life is; We're always failing! Dammit!
>>
>> So, learning how to gracefully fail, and understanding what happens and why, when something fails, is pretty important to achieve the outcome of; "Not failing quite so catastrophically."
> 
> loading a invalid zoen file is far away from "fail geraceful"! if a comozter don't understand the input fully it's not supposed to guess
> 
>> So, while I don't have helpful knowledge to impart to the OP, I think I can say that giving the advice of "don't fail" doesn't seem very helpful.
> 
> where did i give the advice "don't fail"?
> please read my repsonse again!
> 
> * the zone fails on the master
> * the zone is still available on the slaves
> * so the error isn't fatal
> * but you recognize your mistake
> 
> what happens when the error is in the line of the MX record and named would say "well, it's only one line, we still have the zone but no longer an MX"?
> 
> it would lead to a *fatal error* for the behavior of the whole zone, even if *all* or your nameservers go down it would be better because every delivering MTA would just queue the messages in case of a SERVFAIL
> 
> without the MX the would go to the A record of the zone which is in most cases simply the wrong destination
> 

I agree that in a master-slave topology, your argument makes sense.
I this case, the server was a singleton responsible for a small virtual
private network within a much larger one. So. when the server failed to start,
the client had NO DNS for that subnet.



-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/