DockerCLI/man/src/container/port.md

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List port mappings for the CONTAINER, or lookup the public-facing port that is NAT-ed to the PRIVATE_PORT
# EXAMPLES
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b650456536c7 busybox:latest top 54 minutes ago Up 54 minutes 0.0.0.0:1234->9876/tcp, 0.0.0.0:4321->7890/tcp test
## Find out all the ports mapped
$ docker container port test
7890/tcp -> 0.0.0.0:4321
9876/tcp -> 0.0.0.0:1234
## Find out a specific mapping
$ docker container port test 7890/tcp
0.0.0.0:4321
$ docker container port test 7890
0.0.0.0:4321
## An example showing error for non-existent mapping
$ docker container port test 7890/udp
2014/06/24 11:53:36 Error: No public port '7890/udp' published for test