docs/compose/reference/port.md

description	keywords	title
Prints the public port for a port binding.s	fig, composition, compose, docker, orchestration, cli, port	docker-compose port

Usage: port [options] SERVICE PRIVATE_PORT

Options:
--protocol=proto  tcp or udp [default: tcp]
--index=index     index of the container if there are multiple
                  instances of a service [default: 1]

Prints the public port for a port binding.