Dynamic Cloud DNS

Dynamic DNS functionality backed by Google Cloud DNS hosted on Google Cloud Functions. The deployed function can be called with the host, IPv4 and IPv6 address to update. The data can be either URL query parameters or a JSON body.

curl https://us-central1-<project-name>.cloudfunctions.net/updateHost?token=<secretToken>&host=test.example.com&ipv4=192.168.1.1&ipv6=::1

curl https://us-central1-<project-name>.cloudfunctions.net/updateHost \
    -d '{ \
            token: "<secretToken>" \
            host: "test.example.com" \
            ipv4: "192.168.1.1" \
            ipv6: "::1" \
        }'

If neither an IPv4 nor an IPv6 address is provided, the source address of the request is used.

Configuration

Settings are stored in settings.json

Config	Description
`dnsZone`	The Google Cloud DNS Zone name in which the records reside.
`secretToken`	A secret token, used to authenticate users.
`ttl`	Time to live for records in seconds.

To be able to authenticate against the Google Cloud DNS API, a environemnt variable GOOGLE_APPLICATION_CREDENTIALS must be set, which point to a valid credentials.json. The Google Cloud project name is read from the env var GCLOUD_PROJECT.

Local Development

nvm use
npm install
To start the emulator and deploy the function: npm start
To stop the emulator npm stop

Deploy to Google Cloud Functions

Setup Google Cloud Functions
Install the gcloud CLI tool
npm run deploy

Client

If you want to call this automatically under Linux, you can try Dynamic Cloud DNS Client

License

Smith is licensed under the MIT License.