Use this tool to update a Google CloudDNS record to the address of a network interface, like a DynDNS tool.
Download the latest release binary for your architecture. MIPS-hardfloat is reported to work on UniFi Security Gateway.
The tool currently only supports automatic credential fetching, i.e. by setting the GOOGLE_APPLICATION_CREDENTIALS environment variable. See authentication docs.
Run the tool by specifying interface, host, zone and Google Cloud project:
export GOOGLE_APPLICATION_CREDENTIALS=/etc/gcloud/credentials.json
google-cloud-dyndns -interface wan0 -host hostname.domain.tld. -zone zonename -project cloud-project