DNS Redundancy
Stephane Bortzmeyer
bortzmeyer at nic.fr
Thu Oct 21 11:50:39 UTC 2010
On Thu, Oct 21, 2010 at 06:32:09AM -0500,
Martin McCormick <martin at dc.cis.okstate.edu> wrote
a message of 39 lines which said:
> Example:
>
> nameserver 139.78.100.1
> nameserver 139.78.200.1
I always add:
timeout:1
because the default timeout is 5 seconds, much too important to allow
for a smooth fallback.
Other options could be interesting, such as "rotate". See
resolv.conf(5).
Unlike the failure of an authoritative name server, the failure of a
resolver is not really transparent for the Unix stub resolver, as you
have discovered. You may consider solutions using a redundancy at
layer 3 such as VRRP or CARP.
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