Getting Started with Docker: First Steps 🐳

Ever heard "It works on my machine"? Docker solves that.

Here’s a quick step-by-step to get started with Docker—no fluff, just the essentials. 🚀

🛠 Prerequisites
Docker installed: https://www.docker.com/products/docker-desktop
Basic knowledge of terminal/command line

1️⃣ Create a Simple App

Let’s build a basic Python app.

docker-tutorial/
├── app.py
└── requirements.txt

📝 app.py

from flask import Flask

app = Flask(__name__)

@app.route("/")
def home():
    return "Hello from Docker!"

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000)

📝 requirements.txt

flask

2️⃣ Create a Dockerfile
In the same folder, create a file called Dockerfile (no extension):

# Use an official Python image
FROM python:3.11-slim

# Set the working directory
WORKDIR /app

# Copy files to container
COPY requirements.txt .
RUN pip install -r requirements.txt
COPY . .

# Run the app
CMD ["python", "app.py"]

3️⃣ Build Your Image
Open terminal in your project folder and run:

docker build -t hello-docker .

4️⃣ Run Your Container

docker run -d -p 5000:5000 hello-docker

Go to your browser and visit: http://localhost:5000 🎉

🧹 Clean Up

Stop and remove all containers:

docker ps -a
docker stop <container_id>
docker rm <container_id>