Ubuntu 12 Host or domain name not found. Name service error. Resolv.con – resolvconf

After updating to Ubuntu 12.04 my DNS networking is whacked.

Postfix is getting these errors: Host or domain name not found. Name service error

Apparently you can’t edit the /etc/resolv.conf file directly because it will be overwritten by the ‘system’

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

Step 1 – edit this file: /etc/resolvconf/resolv.conf.d/head and add your name server to the file. I’m using Google’s DNS server:

nameserver 8.8.8.8

Step 2 – Restart resolvconf

sudo resolvconf -u

Now, when you look at the /etc/resolv.conf file your entry DNS entry will be in it:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 8.8.8.8

I restarted my networking, “just in case.” Not sure if this step is required

service networking restart

I read somewhere that you should add your name servers directly into /etc/network/interfaces. I did this and restarted resolvconf but it didn’t write the changes to /etc/resolv.conf

iface eth0 inet static
    address 192.168.3.3
    netmask 255.255.255.0
    gateway 192.168.3.1
    dns-search example.com
    dns-nameservers 8.8.8.8

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