Change DNS host name automatically when one device is down

Hi all
I am first copying below the question which I have posted in a thread related to DNS few days back .
You cannot vote on your own post
Hi
our network team has setup Bluecoat proxy server in our main office and DR site . We have configured GPO to populate the details of proxy server hostname in the proxy setting eg : Proxy server . IP1 is the IP address for the device in Head office
and IP2 is the IP address assigned for device in DR site. currently we have given a DNS entry as
Proxyserver - IP1.
So DNS resolves the IP address of device in Head office and authentication and internet access works.
But we want to use the DR device to be used automatically (only )when head office device is not reachable. But how to configure the settings for DNS I am not sure.
I don't want to use round robin as it will send the traffic to both head office and DR in a load balancing fashion .
for this request I had received an advice to use a script to monitor the first device continuously and if not reachable then change the Hostname in DNS to that of second device .
Let me know if anyone can help me on this.
Thanks in advance
Midhin

Hi Midhin,
Agree with Jrv, I also recommend you can consult proxy vendor for a better solution.
In addition, if you still want to update host name in DNS via Powershell, please refer to the script to update A record in DNS:
$Zone = "dns zone"
$oldobj = Get-DnsServerResourceRecord -ZoneName $Zone -RRType "A" -Name "hostname"
$newobj = Get-DnsServerResourceRecord -ZoneName $Zone -RRType "A" -Name "hostname"
$NewObj.RecordData.IPv4Address = "newipaddress"
Set-DnsServerResourceRecord -NewInputObject $NewObj -OldInputObject $OldObj -ZoneName $Zone
If there is anything else regarding the powershell script issue, please feel free to post back.
Best Regards,
Anna Wang
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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If this page has been useful to you, please consider buying a copy of my book,
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Send any questions or comments to: [email protected]
And this is the script:
#!/sbin/sh
# Name: set_hostname
# SCCS Id: @(#)set_hostname 1.2 07/26/04
# Description: This file is a script for re-setting your hostname to the
# right value if you use DHCP (which has a habit of setting
# your hostname to "unknown" if you use a cable modem).
# Copyright Љ 2000-2004 by Rich Teer. All rights reserved.
HOSTNAME=`cat /etc/nodename`
echo "Setting hostname to $HOSTNAME... \c"
uname -S $HOSTNAME
echo "Done."
It's another variant, more complex:
#!/usr/bin/sh
# set_hostname
# Setting DHCP hostname when not provided from DHCP-server.
# Make sure you have a "clean" copy of /etc/hosts (fx. /etc/hosts.orig)
# As this script will clean up and set the hostname in /etc/hosts.
# The script can be run in hand, or as a startup script in:
# Solaris 8/9: /etc/init.d; /etc/rcX.d
# Programmed by: Yngve Berthelsen
# Date: 20050216
# E-Mail: [email protected]
# Last updated: 20050216
# History:
### Variables used in script
NODENAME="/etc/nodename"
HOSTALIAS=`cat /etc/nodename|nawk ' BEGIN { FS="." }; { print $1 }'`
HOSTFILE="/etc/hosts"
ORGHOST="/etc/hosts.orig"
HOSTNAME=`/usr/bin/hostname`
NIC="hme0" # Change hme0 to the DHCP interface NIC
DHCPNIC="/etc/dhcp.$NIC"
IPADDRESS=`ifconfig $NIC|grep inet|nawk '{ print $2 }'`
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SetHostname()
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/usr/bin/uname -S $NODENAME
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/usr/bin/hostname $NODENAME
return
# main
case "$1" in
'start')
if [ -f $DHCPNIC ]
then
if [[ $HOSTNAME == "Unknown" ]]
then
SetHostname
elif [[ $HOSTNAME == "unknown" ]]
then
SetHostname
fi
fi
'stop')
if [ -f $DHCPNIC ]
then
cp -frp $ORGHOST $HOSTFILE
fi
echo "Usage: $0 { start |stop }"
exit 1
esac
exit 0
### This script is submitted to BigAdmin by a user of the BigAdmin community.
### Sun Microsystems, Inc. is not responsible for the
### contents or the code enclosed.
### Copyright 2007 Sun Microsystems, Inc. ALL RIGHTS RESERVED
### Use of this software is authorized pursuant to the
### terms of the license found at
### http://www.sun.com/bigadmin/common/berkeley_license.html
I use the first, "short" script, it works.

Change DNS host name automatically when one device is down

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