Dynamically set primary or backup IP for a DNS entry

dyndns.sh -o puppetmaster -z lab.dobrev.eu -p 10.0.0.1 -b 10.0.0.2

As long as 10.0.0.1 is reachable puppetmaster.lab.dobrev.eu is going to point to it. Else 10.0.0.2 is being used

dyndns.sh -o puppetmaster -z lab.dobrev.eu -p 10.0.0.1 -b 10.0.0.2 -b 10.0.0.3

-b can be used more than once. In that case the script will fall back to the first available backup IP.

This software is dual-licensed under Affero GPL and MIT License with the hope to be useful for a wider audience.