This clarifies the usage of the `externalhosts` option and brings its documentation in line with similar options such as `externalip`. Related issue: #6141 [skip ci]
This is an example systemd service file for lnd designed to run alongside a bitcoind service. This file is loosely based on https://github.com/bitcoin/bitcoin/blob/master/contrib/init/bitcoind.service, https://gist.github.com/Stadicus/f0c6db4fa6cf787f19d9d3444b91633f, and my own experience managing lnd with systemd.
Daniel McNally