Detailed explanation of Docker container network port configuration process

Exposing network ports

In fact, there are two parameters in Docker that involve exposing network ports, namely -p and -P. The following will introduce them separately.

-P

With -P, Docker will randomly assign an unused port to the application on the host and map it to the open port in the container.
For example, as follows:

As you can see, Docker assigns a random port 32768 to the application, which can be used to access the container.
nginx（http://lcalhost:32768）.

-p

The -p parameter has several different uses:

hostPort:containerPort

This usage is to bind the host port and the container port, as follows:

The above command means mapping port 80 of the host machine to port 80 of the container. The first port 80 is port 80 of the host machine, and the second port 80 is port 80 of the container.

ip:hostPort:containerPort

This method maps the port of the specified IP address to the port of the container. as follows:

Map port 80 of the 192.168.0.195 address to port 80 of the container.

ip::containerPort

This method maps a random port of a specified IP address to an open port of a container, as follows

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