Multiple SOA

Barry Margolin barmar at
Wed Feb 11 22:56:51 UTC 2009

In article <gmvbtc$b8a$1 at>,
 Prabhat Rana <prana9533 at> wrote:

> Hello,
> Is it possible to have more than one hosts assigned as SOA in a given zone 
> file?
> I have BIND 9.5 and two UNIX hosts as authoritative servers ( and 
> for the domain 
> Currently I have host1 as master and host2 configured as slave for 
> In case if host1 is down, I'd like to have just switch it to 
> master my making ca changed in named.conf and not having to touch the zone 
> file. And have host2 continue to respond to queries and also perform zone 
> file transfer to bunch of slave downstream which are configured both host1 
> and host2 to be master for this doman. So can I have both host1 and host2 as 
> SOA for the zonefile for 
> In fact there are hundreds of other zone files for the domains that its auth 
> to. If possible I'd like to have 2 SOAs in all these zone files so that when 
> host1 is down, all I need to do is edit the named.conf file of host2. 
> Thanks

The SOA record has nothing to do with zone transfers.  Slaves pull zone 
transfers from the server IPs in the "master" clause in their 
named.conf.  You can list multiple masters there, and the slaves will 
pull from any master that has a higher serial number than the one they 

Barry Margolin, barmar at
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***

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