NDCHost has made available a nice script that will increase the serial numbers for all DNS zones:
# cd /sbin
# rm -f updateserial
# wget http://www.ndchost.com/cpanel-whm/scripts/updateserial/download.php
# chown root.root updateserial
# chmod 0750 updateserial
# /sbin/updateserial -d /var/named
To activate your changes, be sure to reload rndc:
# rndc reload
97%* of providers don’t allow their customers complete control of reverse DNS. If you’re part of that 3%*, check out this wiki article as a resource.
* Statistics made up, but accurate from what I’ve seen.
Installing cPanel DNSonly should only be done on a fresh installation of a supported OS.
cd /home
wget http://layer1.cpanel.net/cpanel-universal-dnsonly-install.sea
sh cpanel-universal-dnsonly-install.sea
cd cpanel-universal-dnsonly-install
sh install
Disabling DNS recursion is something most administrators will suggest, as having it enabled can cause performance issues.
vi /etc/named.conf
Then, in the options { section, add the following:
recursion no;
If recursion yes; is already there, just change it to recursion no; and restart named to activate your changes.
./scripts/restartsrv_named
So you’re migrating servers and you want to make sure that the TTL’s on your DNS zones are low so that DNS propagates quickly. Instead of changing all the TTL’s manually in Edit a DNS Zone in WHM, you can run a very simple script from SSH to change all TTLs from 14400 to 300 seconds.
First we’ll create a backup, then we’ll make the mass change:
1) mkdir /root/var.named.backup/
2) cp -Rv /var/named/* /root/var.named.backup/
3) cd /var/named
4) replace -v “$TTL 14400″ “$TTL 3600″ — *.db
5) /usr/sbin/rndc reload
If you have DNS zones using a TTL other than 14400 seconds, rerun the script again, replacing 14400 with that value.
Next you’ll likely want to increase the serial number for your DNS zones, so that BIND recognizes the changes.
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