Day 2: Building My First Flask App with Docker – DevOps Journey Begins
🚀 Aspiring Cloud & DevOps Engineer | AWS Free Tier User | Learning by Building
Hi, I’m Sukaran Mahajan — I am working as System Administrator and currently on a focused journey to become job-ready in AWS Cloud, DevOps, and Infrastructure automation. With a growing foundation in Linux, Git, Docker, and Terraform, I’m documenting everything I learn to help others and strengthen my understanding.
💡 Currently Learning: • AWS (EC2, S3, IAM, VPC, Lambda) • Docker, Terraform & Ansible • CI/CD tools (GitHub Actions, Jenkins) • Kubernetes basics
🛠 Hands-on Projects: • Flask + Docker App Deployment • Terraform-based AWS Infrastructure • EC2 SSH automation & S3 access control
📝 I also write beginner-friendly technical blogs on Hashnode: 🔗 https://devopswithsukaran.hashnode.dev
💼 Open to internships, DevOps/cloud roles, and collaborative projects.
Let’s connect and grow in tech together! 🔗
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📝 Title:
Day 2: Building My First Flask App with Docker – DevOps Journey Begins
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🧠 Description (For Hashnode SEO):
Today I containerized my first Python Flask application using Docker. I learned how to write a Dockerfile, run a container, and understand the importance of __name__ in Flask. Follow along my DevOps journey from scratch!
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📄 Blog Content:
# 🚀 Day 2: Building My First Flask App with Docker
Hey everyone! 👋
Welcome to **Day 2** of my DevOps learning journey. I'm sharing everything I learn each day as I move toward my goal of becoming a DevOps engineer. Today, I built my first Flask application and containerized it using Docker.
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## 🔧 What I Did Today
I created a small Flask web application, then used Docker to containerize and run it. This is my first step toward understanding how apps run in isolated environments — something essential in DevOps.
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## 📁 Project Structure
flask-docker-app/ ├── app.py ├── requirements.txt └── Dockerfile
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## 🧠 app.py Code
```python
from flask import Flask
app = Flask(__name__)
@app.route('/')
def home():
return "🚀 Hello from Flask inside Docker on EC2!"
if __name__ == '__main__':
app.run(host='0.0.0.0', port=5000)
\> I learned the difference between __name__ and --name--, and why it's important to write it properly.
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📦 Dockerfile
FROM python:3.9-slim
WORKDIR /app
COPY requirements.txt requirements.txt
COPY app.py app.py
RUN pip install --no-cache-dir -r requirements.txt
EXPOSE 5000
CMD ["python", "app.py"]
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⚙️ How I Built and Ran the Image
docker build -t flask-py .
docker run -p 5000:5000 flask-py
Then I opened my browser and visited:
http://localhost:5000
✅ My app worked!
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💡 Key Learnings
Flask basics and routing
Difference between Flask(__name__) vs Flask(--name--)
Docker basics: image, container, ports
How to write a Dockerfile
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🔜 Next Steps (Tomorrow)
Deploy this Docker app on AWS EC2
Learn to SSH into EC2 and run containers
Link GitHub and LinkedIn to showcase the project
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💬 Final Thoughts
Even though I come from a system administration background, learning Docker and Flask felt very exciting. I now understand how containers work and why they’re so useful in DevOps pipelines.
Stay tuned for more updates. If you’re on a similar path, let’s connect on LinkedIn!
#DevOps #Docker #Flask #AWS #100DaysOfCloud #HashnodeBlog
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