Docker Tutorial for Beginners #14 What Is Docker Expose Port

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What Is Docker Expose Port?
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The expose keyword in a Dockerfile tells Docker that a container listens for traffic on the specified port. So, for a container running a web server, you might add this to your Dockerfile:

EXPOSE 80


When you run a container, by default, its network is isolated from the host system. If your application inside the container listens on a specific port, you need to expose that port to the host machine to access the service.

Docker Run with Port Mapping:

You can expose container ports to the host using the -p or --publish option with the docker run command.
For example: docker run -p 8080:80 mywebapp
This maps port 80 inside the container to port 8080 on the host.


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