How to get rid of reddog.microsoft.com search domain on Ubuntu Linux in Azure

By   05-18-2018 · 1 minute read · 136 words


If you’ve used Linux on Azure for any length of time you’ll find an annoying search domain that Azure DHCP appends to your resolv.conf.

Here’s a copy of my resolv.conf as an example.

# 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 192.168.10.11
nameserver 192.168.10.12
search reddog.microsoft.com

Microsoft does this by default even if you have your own internal name servers since the DHCP process within a VNET is handled by Azure.

To get rid of this annoyance you can edit your /etc/dhcp/dhclient.conf and add the following one liner:

supersede domain-name "dky.io";

After that you can refresh DHCP with:

sudo dhclient -v

Once done check your /etc/resolv.conf to find the search domain reddog.* to be replaced with your domain above.

azure   dns   reddog  

comments powered by Disqus