Docker port Command
docker port is used to list the port mappings for a specified container, or to find out the public port that a PRIVATE_PORT is NATed to.
Syntax
docker port [OPTIONS] CONTAINER [PRIVATE_PORT[/PROTO]]
Example
To view the port mappings for the container named mymysql:
tutorialpro@tutorialpro:~$ docker port mymysql
3306/tcp -> 0.0.0.0:3306