Port mapping || Fixed & random Port || Two ways
In Docker, the containers themselves can have applications running on ports. When you run a container, if you want to access the application in the container via a port number, you need to map the port number of the container to the port number of the Docker host. Let’s look at an example of how this can be achieved.
Docker allows you to map ports from containers to the hosts running the containers. The mapping can be done dynamically with the publish all flag or explicitly with the publish flag. And by default, the expose instruction in the Docker file doesn’t actually perform any port mapping.
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