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docs/compose/reference/port.md

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description keywords title notoc
Prints the public port for a port bindings. fig, composition, compose, docker, orchestration, cli, port docker-compose port true 
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.