[dns-operations] Best practices for Linux/UNIX stub resolver failover

William F. Maton Sotomayor wmaton at ottix.net
Wed Apr 23 01:15:52 UTC 2014

On Tue, 22 Apr 2014, Ray Van Dolson wrote:

>>> 1. Make sure the first nameserver listed in resolv.conf never goes
>>>    down by using Anycast DNS or some other failover mechanism like
>>>    VRRP or CARP on the DNS server side.

I recall a paper that discusses this to some degree from a USENIX LISA... 
ah, here it is:


Contains a comparison of various resolver behaviours and the like.  Would 
be interesting to see what, if any, changes after 10 years have gone by in 
Table 1.

>>> What do the DNS experts say about best practices for DNS failover in
>>> the stub resolver?
>> I'm curious to see what they think here too.
> Not an expert either, but do like the local resolver option a lot.

IANAE either, but anycast in the campus and wide area have done well in 
these parts.


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