How to Build Docker Images from Scratch with Dockerfile
In this step-by-step tutorial, you’ll learn how to build Docker images from scratch using Dockerfile. Perfect for beginners, this video covers everything from Dockerfile basics to real-world examples with Python (Flask) and Java (Spring Boot).
🎬 What You Will Learn:
What a Dockerfile is and why it’s important
Meaning of key Dockerfile keywords (FROM, COPY, RUN, CMD, EXPOSE, VOLUME, ENTRYPOINT)
How Docker images are built in layers for efficiency
Creating Python (Flask) Docker image
Creating Java (Spring Boot) Docker image with Maven
Multi-stage Dockerfiles for smaller, optimized images
✅ Prerequisites:
Docker Desktop / Engine installed
Basic command line knowledge
Java & Python environment
🐍 Python Example – Flask App
Build a Docker image for a Flask app with a multi-stage Dockerfile
Run it using:
docker build -t python-app .
docker run -p 5000:5000 python-app
☕ Java Example – Spring Boot App
Build and run a Spring Boot Maven app with Docker:
docker build -t java-app .
docker run -d -p 8080:8080 java-app
By the end of this video, you’ll understand:
✔️ Dockerfile basics
✔️ How layers work in Docker images
✔️ How to create Docker images for Java & Python apps
✔️ How to optimize with multi-stage builds
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#Docker #DevOps #Dockerfile #Java #Python #Containers