Notes from Docker mastery course by Bret Fisher on Nerdsid.com

Docker networking

Tue, 07 Apr 2026 07:32:28 +0530

Docker networking is like batteries included but removable/configurable.

Port checking

docker container port <container>

Default bridge network.

docker contianer inspect --format "{{NetworkSettings.IPAddress}}" <container id>

docker network ls

Fri, 03 Apr 2026 07:32:28 +0530

A container is an running instance of an image.

Just like how in OOPs an object is an instance of a class. The class defines the blueprint. The object is an instance of the class.

You can have may containers running on the same image.

Docker’s default image registry is called Docker hub (hub.docker.com).

docker container run --publish 1234:80 nginx

The publish part has the syntax : It routes the traffic from host IP to container IP.