Slave fails failover
Pete Ehlke
pde at rfc822.net
Fri Jul 28 15:27:24 UTC 2006
On Thu Jul 27, 2006 at 15:22:04 +0200, Jan Engelhardt wrote:
>Hello,
>
>
>as commonly done, I have two DNS servers for a domain, that is, the
>toplevel zone at the hoster is
>
> $ORIGIN xyz.com.
> jen IN NS dns1.foo.com. (running ISC BIND 9.3.2)
> jen IN NS dns2.bar.com. (also ISC BIND 9.3.2)
>
> $ORIGIN foo.com.
> dns1 IN A 1.2.3.4
>
>dns1's zone file is (shortened):
>
> $ORIGIN xyz.com.
> @ SOA ...
> IN A 1.2.3.4
>
>dns2 is configured as a slave to dns1. Trying to resolve xyz.com from
>anywhere in the world usually yields 1.2.3.4, which is ok.
>
>Now that dns1 is powered off, I noticed that xyz.com cannot be resolved
>anymore, even though that should have been the purpose of having slave
>servers, is not it?
>
>The dns2 logfile says
>
>Jul 27 11:44:16 dns2 named[5652]: zone jen.xyz.com/IN: refresh: retry
>limit for master 1.2.3.4#53 exceeded (source 0.0.0.0#0)
>Jul 27 11:44:16 dns2 named[5652]: zone jen.xyz.com/IN: Transfer started.
>Jul 27 11:44:19 dns2 named[5652]: transfer of 'jen.xyz.com/IN' from
>1.2.3.4#53: failed to connect: host unreachable
>Jul 27 11:44:19 dns2 named[5652]: transfer of 'jen.xyz.com/IN' from
>1.2.3.4#53: end of transfer
>
>Should not dns2 have kept the zones of the last successful transfer and use
>them?
Only until the zones Expiry time has been reached.
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