The script updates a Digitial Ocean DNS record with one given on the command-line. It makes no effort to determine your IP address, but is useful in situations where you know it.

You'll need a DigitalOcean API key and configure the script in the header.

This was designed to run on a router with systems like asuswrt-merlin.

The script depends on JSON.sh, and will download a copy into the current directory (pinned to a known SHA) if it doesn't exist. If your deploy won't have write access, download it and give it executable permissions in the same directory.

./do-dns 203.0.113.25

./do-ddns $(ifconfig eth2.2 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1')

This command uses the IP address of the device's eth2.2 interface as do-ddns' IP address parameter.