Bulk Update DNS Zones

[rmatakajr]

Hi

Just looking for some clarity here in reguards to updating WHM zones
I found these 2 suggestions here

cd /var
cp -R named named.backup
replace "OLDIP" "NEWIP" -- /var/named/*.db
replace "OLDDNS" "NEWDNS" -- /var/named/*.db
service named restart

And...

1) make backup copy of your zones folder cp -a /var/named /var/named.backup

2) Change into your zone folder cd /var/named ( or /var/named/chroot/named)

3) use the perl to replace the old ip with new ip

perl -pi.bak -e "s/oldip/newip/g" *.db


Now Id rather use the Perl script.. however I have been reading that there
are serial numbers to the files?

Can anybody help me clarify what needs to be done here?

Thanks
Ricky

 

[cPanelTristan]

Hello Ricky,

The serial number would need to be updated for all of the DNS zones. Here's a post on how to perform that action:

http://forums.cpanel.net/f5/how-incremental-serial-number-dns-zone-211732.html#post873142

As for clarifying what needs done, first a backup would need to be made of /var/named folder to ensure anything that is modified can be reverted if the change breaks the zones. After you have a backup, then you can use whatever method you prefer to update the IP (whether it be the perl script or the bash command). After making the updates, you'll need to reload the zones:

rndc reload

You don't necessarily have to restart named, but you could always do that. I typically prefer to reload the zones using rndc instead.

Thanks!

 

[rmatakajr]

Hey Thanks for that update!

So Just to be clear I would

1) Back Up All
# cp -a /var/named /var/named-backup

2) Replace The IP and DNS

perl -pi.bak -e "s/oldip/newip/g" *.db
perl -pi.bak -e "s/olddns/newdns/g" *.db

3) Update The Serials

find /var/named/*.db -mtime -1 -exec perl -pi -e 'if (/^\s+(\d{10})\s+;\s+serial/i)


Just want to be super clear here what Im not missing anything. Im not sure what
the -pi.bak does in # 2

Can you just verify for me

Thnaks!
Ricky

 

[cPanelTristan]

Hello Ricky,

If you make the backup, if anything goes wrong, then you can revert.

As for the steps, they appear correct, except you've forgotten the step to reload the zones at the very end:

rndc reload

Also, here is what -pi.bak -e does:

perl -pi.bak - Google Search

To quote most those search engine hits:

"If you want to edit the files in place, editing each file before going on to the next"
and
"edits the files in-place, saving original as *.bak"

Thanks!