Lesson 1.1
Images, containers, and Dockerfiles
An image is a stacked filesystem plus metadata; a container is a running instance of one. Every Dockerfile instruction is a layer.
Taught byAlina CostaDocker · Kubernetes · CI/CD · Application security
Overview
An image is a stacked filesystem plus metadata; a container is a running instance of one. Every Dockerfile instruction is a layer.
What this lesson covers
- Distinguish an image from a running container
- Write a Dockerfile that builds reproducibly
- Choose a base image deliberately
This lesson sits in Containers and Images, part of DevOps with Docker and Kubernetes. It assumes what came before it and leads directly into the next lesson in the module.
In this lesson you will:
- Distinguish an image from a running container
- Write a Dockerfile that builds reproducibly
- Choose a base image deliberately