script - automatic change A record

[Kumar, Naveen, Vodafone Group]

Hi Mark,

If your target server has tcp port, you can create SRV record, DNS server will do the healthcheck and failover accordingly.
I think you can try this!!!

Regards,
Naveen
-----Original Message-----
From: bind-users-bounces+naveen.kumar32=vodafone.com at lists.isc.org [mailto:bind-users-bounces+naveen.kumar32=vodafone.com at lists.isc.org] On Behalf Of Mark Andrews
Sent: Tuesday, November 26, 2013 4:27 AM
To: Paweł Ch.
Cc: bind-users
Subject: Re: script - automatic change A record


In message <CAB9EgSx4Vd4zMAATy_R_8kDxcWswP1ig7wsseK+XG-k83_Okew at mail.gmail.com>
, =?UTF-8?B?UGF3ZcWCIENoLg==?= writes:
> 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.
> 
> Please help with writing a script.
> 
> pch0317
> 

#!/bin/sh
while :
do
	if ping -c 5 -t 5 1.2.3.4
	then
		nsupdate << EOF
update del host.example.net A
update add host.example.net 30 A 1.2.3.4 send EOF
	elif ping -c 5 -t 5 1.2.3.5
		nsupdate << EOF
update del host.example.net A
update add host.example.net 30 A 1.2.3.5 send EOF
	else
		nsupdate << EOF
update del host.example.net A
update add host.example.net 30 A 1.2.3.4 update add host.example.net 30 A 1.2.3.5 send EOF
	fi
	sleep 60
done
		


--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org
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