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  Docker Images & Containers: Dockerfile Explained, docker build, run, exec, and Image Layers 📅 Published: Feb 2026 ⏱️ Estimated Reading Time: 18 minutes 🏷️ Tags: Docker, Docker Images, Dockerfile, Containers, Docker Commands, Image Layers Introduction: From Code to Running Application When you build a Docker image, you are creating a template for running your application. When you run a container, you are creating a live instance of that template. Understanding how images are built and how containers run is essential for effective Docker usage. This guide covers the complete lifecycle: writing a Dockerfile, building images, running containers, and understanding the layered architecture that makes Docker efficient. Part 1: The Dockerfile What is a Dockerfile? A Dockerfile is a text file containing instructions for building a Docker image. It is like a recipe. Each instruction adds a layer to the image. Docker reads the Dockerfile and executes the instructions in order. Docker...