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.
fig, composition, compose, docker, orchestration, cli, port
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https://docs.docker.com/v17.12/compose/reference/port/