script - automatic change A record

[Barry Margolin]

In article <mailman.1743.1385388659.20661.bind-users at lists.isc.org>,
 Sten Carlsen <stenc at s-carlsen.dk> wrote:

> On 25/11/13 15.00, Alan Clegg wrote:
> > On Nov 25, 2013, at 7:55 AM, Pawe? Ch. <pch0317 at gmail.com> wrote:
> >
> >> Hi list,
> >>
> >> I would like to write script that change two entry in my zone file: SOA 
> >> and A record.
> >>
> >> I have 2 web site: mail site site1.tld and backup site site2.tld. Script 
> >> should monitor site1.tld and when site is unavailable it should change A 
> >> record in zone file to indicate to site2.tld. If site1.tld is available 
> >> again then A record should indicate to it.
> >> Script should change SOA serial number.
> If this really is mail only as I read from your mail, SMTP already takes
> care to use the backup server, just put correct priority in DNS.

You're assuming he's talking about the incoming mail server. He could be 
talking about the outgoing server and/or POP/IMAP server that users put 
into their mail client configurations. DNS-based failover is a 
reasonable approach for these.

-- 
Barry Margolin
Arlington, MA