How to Build & Run a Login Form using Flask + Docker

Sharon Rajendra Manmothe
Nov 14, 2025
1 min read

Updated: Nov 16, 2025

Objective

Students will learn

How to Build & Run a Login Form using Flask + DockerCreate a simple Flask application with a login form
How to Containerize the application using Docker
How to Run the Docker container and access the login form in the browser

PART–1: Create the Flask Project

Step 1: Create project folder

Step 2: Create a file named app.py

Add this code:

from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        name = request.form['name']
        password = request.form['password']
        return f"Welcome {name}, your login is successful!"
    return render_template('login.html')

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

Step 3: How to Create a folder named templates

Inside it, create a file login.html

templates/login.html

<!DOCTYPE html>
<html>
<head>
    <title>Student Login</title>
</head>
<body>
    <h2>Login Form</h2>
    <form method="POST">
        <label>Name:</label>
        <input type="text" name="name" required><br><br>

        <label>Password:</label>
        <input type="password" name="password" required><br><br>

        <button type="submit">Login</button>
    </form>
</body>
</html>

PART–2: How to Create Docker Setup

Step 4: Create requirements.txt

Flask

Step 5: How to Create a Dockerfile

Inside the project folder, create a new file named Dockerfile

Dockerfile

FROM python:3.10

WORKDIR /app

COPY requirements.txt .

RUN pip install -r requirements.txt

COPY . .

EXPOSE 5000

CMD ["python", "app.py"]

PART–3: How to Build & Run the Docker Container

Step 6: Build the Docker Image

Open terminal inside project folder:

docker build -t student-login-app .

Step 7: Run the Docker Container

docker run -d -p 5000:5000 student-login-app

Step 8: Test the App

Open browser and visit:

http://localhost:5000

You should see the Student Login Form.

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How to Build & Run a Login Form using Flask + Docker

Objective