A simple container to update a Google Cloud DNS record when the host networks public IP has changed.
Firstly, create a directory in which to store your config.yaml and your Google Cloud service account key under service-account-key.json.
From there, you can run docker run -v $PWD/data:/app/data arrisar/gcp-ddns.
If no config.yaml exists, the container will generate one and exit. Simply update this file and run again.