NAD can automatically configure itself with Circonus via a few command line options. When running in configuration mode, NAD will create a check and graphs with Circonus and then exit. It will not attempt to bind to any port, so is safe to use while running normally.
Your chef recipe will have an execute resource that runs NAD with the special self-config options to actually provision checks and graphs. It will then use a typical service resource to manage the ongoing NAD service.
The Chef NAD-cookbook can be found here https://github.com/circonus-labs/nad-cookbook and it will automate installing from the omnibus Linux packages that we publish.