Port mapping
Port mapping forwards network traffic from a port in one network environment to a port in another, such as from a host to a container.
.NET in Action, Second Edition
Port mapping associates a host network port with a port exposed by a container.
- How it is used
- Makes a web service running inside a Docker container reachable through a host machine port.
- How deep it goes
- Distinguishes EXPOSE from publication and demonstrates host-to-container routing with concrete localhost URLs.
- Examples
- Uses AsciiArtSvc, EXPOSE 5101, host port 5000, localhost URLs, and Docker Desktop's port-assignment dialog.
- What you can do after
- Operate/configure a containerized web service by assigning a host port to its exposed container port.
Read how .NET in Action, Second Edition explains port mapping →
Build Python Web Apps with Streamlit
Container port mapping connects a port on the host machine to a port exposed by a Docker container.
- How it is used
- Connects browser traffic on the host to a Streamlit server running inside a Docker container.
- How deep it goes
- Explains host and container roles, command syntax, local access, and Elastic Beanstalk configuration without covering networking internals.
- Examples
- Uses 8502:8501 locally and 80:8501 for Elastic Beanstalk deployment.
- What you can do after
- Operate a containerized Streamlit app locally and configure its exposed port for Elastic Beanstalk.
Read how Build Python Web Apps with Streamlit explains port mapping →
Related concepts
- docker-compose.ymlconfigured by · docker-compose.yml is a declarative YAML configuration file that defines Docker Compose application services and their containers, networks, volumes, and runtime settings.
- containerconfigures · A software container is an isolated execution environment that packages an application and its dependencies while sharing the host operating system kernel.
- port numberuses · A port number is a numeric transport-layer identifier that directs network traffic to a service or application endpoint on a host.
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