Created
May 24, 2013 15:41
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script for use with `nsupdate` to update linux client DNS on a DNS server... in this instance, I am targeting a Windows Server DNS server 2003/2008/2012+. I have manually created the PTR and A records once, and granted the Everyone ACE the "Write" permission in the DACL of the PTR and A records.
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#!/bin/sh | |
#original from http://community.spiceworks.com/topic/262635-linux-does-not-register-on-the-windows-ad-dns | |
# reply of Phil6196 Oct 1, 2012 at 12:41 AM (EDT) | |
ADDR=`/sbin/ifconfig eth0 | grep 'inet addr' | awk '{print $2}' | sed -e s/.*://` | |
HOST=`hostname` | |
echo "update delete $HOST A" > /var/nsupdate.txt | |
echo "update add $HOST 86400 A $ADDR" >> /var/nsupdate.txt | |
echo "update delete $HOST PTR" > /var/nsupdate.txt | |
echo "update add $HOST 86400 PTR $ADDR" >> /var/nsupdate.txt | |
nsupdate /var/nsupdate.txt |
Hey I don't know if this is related but I need nsupdate to be one line for a specific use case is this possible?
Hey I don't know if this is related but I need nsupdate to be one line for a specific use case is this possible?
It depends on what you define as 'one line'. The nsupdate commands (update add ...
) have to be on separate lines, i.e. they are newline delimited. You could use the printf command to have it as a single line and use '\n' newline character where needed, but it gets ugly:
ipaddress=$(hostname -i); arpa=$(printf 'arpa.in-addr.%s.' "$ipaddress" | tac -s.); fqdn=$(hostname -f).; mydnsserver=$(nslookup -type=soa $(hostname -d) | grep origin | awk -F'= ' '{print $2}'); printf "server $mydnsserver\nupdate add $fqdn 3600 IN A $ipaddress\nsend\nupdate add $arpa 3600 IN PTR $fqdn\nsend\nquit\n" | nsupdate
I haven't tested this btw, but the general structure should work. Remove the | nsupdate
to check the syntax.
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I'm loving this Unix-y version without needing a temporary file that can check your domain (if machine is domain joined) and update the domain's DNS server ad hoc say if your sssd.conf had been missing
ad_hostname
when you don't use the FQDN as the hostname.Add
-d
and-D
afternsupdate
to get a really verbose listing of what it is doing as it updates.