YouTip

# Docker port Command [Docker Command Encyclopaedia](#) * * * `docker port` CommandUsed to display port mapping information of a container, i.e., how ports inside the container are mapped to ports on the host. `docker port` CommandVery useful for understanding how containers interact with the host network. ### Syntax docker port CONTAINER [PRIVATE_PORT] * **`CONTAINER`**: The name or ID of the container to query for port mappings. * **`PRIVATE_PORT`** (optional): The port number inside the container. * **`PROTO`** (optional): Protocol type (`tcp` or `udp`），The default is `tcp`。 View all port mappings of a container: docker port my_container Show all port mapping information for the container named my_container. View mappings for a specific port: docker port my_container 80 Show which host port the port 80 inside the container named my_container is mapped to. View mappings for a specific port and protocol: docker port my_container 80/tcp Show which host port the TCP port 80 inside the container named my_container is mapped to. ### Examples Start a container and map ports: docker run -d -p 8080:80 --name my_container nginx ThisCommandSet my_container Port 80 of the container is mapped to port 8080 on the host machine. View port mappings of a container: docker port my_container Output: 80/tcp -> 0.0.0.0