ISO or virtual appliance

Mike Mitchell Mike.Mitchell at
Thu Aug 22 15:35:32 UTC 2013

lbnamed is a DNS server written in Perl.  You delegate a zone to it, and let it dynamically figure out the best IP address to return.


There are 3rd-party appliances that do similar functions, such as F5's GTM or Cisco's GSS.

Mike Mitchell
From: Manish Rane [manishr78 at]
Sent: Thursday, August 22, 2013 5:05 AM
To: Mike Mitchell
Cc: Steven Carr; bind-users
Subject: Re: ISO or virtual appliance

Well, I was thinking on the same line. Use nagios plugins check_tcp and monitor the status. The only challenge I am seeing here is updating zone and nsupdate I believe can only work with Dynamic zones and not with static entries.

Sed/awk might not scale well if the zone count increases hence wondering if there are any php/jsp developers available in this community who can take this up a anew open source project just like developing solution similar to F5 GTM/LTM.

I guess if we use mysql as a backend to store the zone or entries then by passing the queries we can alter the zone file. But again challenges are how to run a check_tcp  from front end or pass the output of that command so that appropriate changes will be done in zone file.

Any ideas guys??

On Thu, Aug 22, 2013 at 1:16 PM, Mike Mitchell <Mike.Mitchell at<mailto:Mike.Mitchell at>> wrote:
Several years ago I used a Perl script called "lbnamed" that monitored status and returned the host IP address that was least loaded.

Mike Mitchell

-------- Original message --------
From: Steven Carr <sjcarr at<mailto:sjcarr at>>
Date: 08/21/2013 10:25 PM (GMT-08:00)
To: bind-users <bind-users at<mailto:bind-users at>>
Subject: Re: ISO or virtual appliance

On 22 August 2013 05:39, Manish Rane <manishr78 at<mailto:manishr78 at>> wrote:
> So, DNS will monitor the host on port 80 and as soon as it detects that
> either of the host/link is down it would remove the associated entry and
> re-populate the entries
> Is any one aware of such solution readily available? I believe I already
> posted similar question but havent heard much positive things.

The only open source "appliance" I'm aware of is but AFAIK that doesn't update DNS, it
proxies the traffic on a virtual IP address to balance/provide HA.

The easiest method if you want to do it by DNS is a simple script that
is cron'd to run every X minutes and either use `nsupdate` to push
updates to the records or sed/awk to rename records and then reload
zone files. Not sure what you are struggling with, this is something
that can be knocked together in a matter of minutes by any
scripter/programmer. If you have a monitoring system like Nagios you
could use the various hooks it provides to run scripts when something
happens/changes state rather than writing your own custom monitoring

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