Initial commit for Docker project

README.md

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+# Docker Web Application
+
+## Prerequisites
+- Docker installed on the system.
+
+## Application Description
+This is a simple Flask web application running inside a Docker container. The app accepts user input via a form and displays the submitted data.
+
+## Docker Setup
+
+1. **Preparation**
+    Run the following command to set up the environment:
+    ```bash
+    ./prepare-app.sh
+    ```
+
+2. **Start the Application**
+    Start the application with:
+    ```bash
+    ./start-app.sh
+    ```
+    The app will be available at: [http://localhost:5000](http://localhost:5000)
+
+3. **Stop the Application**
+    To stop the application:
+    ```bash
+    ./stop-app.sh
+    ```
+
+4. **Remove the Application**
+    To remove all Docker containers, networks, and volumes:
+    ```bash
+    ./remove-app.sh
+    ```
+
+## Working Example
+1. Prepare the application:
+    ```bash
+    ./prepare-app.sh
+    ```
+2. Start the app:
+    ```bash
+    ./start-app.sh
+    ```
+3. Visit [http://localhost:5000](http://localhost:5000) in a browser.
+
+4. Stop the app:
+    ```bash
+    ./stop-app.sh
+    ```
+
+5. Remove the app:
+    ```bash
+    ./remove-app.sh
+    ```
+
+## Conclusion
+This application demonstrates Docker containerization of a Flask app with basic form handling.

docker-compose.yml

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+version: '3.8'
+services:
+  flask-app:
+    build: .
+    ports:
+      - "5000:5000"
+    networks:
+      - flask-network
+    restart: unless-stopped
+  # You can add other services here, like a database if required
+
+networks:
+  flask-network:
+    driver: bridge
+
+volumes:
+  flask-data:
+    driver: local

dockerfile

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+# Use an official Python runtime as a parent image
+FROM python:3.8-slim
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy the current directory contents into the container at /app
+COPY . /app
+
+# Install Flask
+RUN pip install --no-cache-dir flask
+
+# Set the environment variable for Flask
+ENV FLASK_APP=testapp.py
+ENV FLASK_RUN_HOST=0.0.0.0
+
+# Expose port 5000 for the Flask app
+EXPOSE 5000
+
+# Run the Flask application
+CMD ["flask", "run", "--host=0.0.0.0", "--port=5000"]

prepare-app.sh

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+#!/bin/bash
+
+# Create a Docker network
+echo "Creating Docker network..."
+docker network create flask-network
+
+# Create a named volume for persistent storage (for example, for database)
+echo "Creating Docker volume..."
+docker volume create flask-data
+
+echo "Preparation complete!"

remove-app.sh

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+#!/bin/bash
+
+# Remove the Flask app container
+echo "Removing Flask app container..."
+docker rm flask-app
+
+# Remove Docker network
+echo "Removing Docker network..."
+docker network rm flask-network
+
+# Remove Docker volume
+echo "Removing Docker volume..."
+docker volume rm flask-data
+
+echo "App removed successfully!"

start-app.sh

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+#!/bin/bash
+
+# Start the Flask app container
+echo "Starting Flask app container..."
+docker run -d --restart unless-stopped --name flask-app --network flask-network -p 5000:5000 flask-app
+
+# Optionally, start any additional services (like a database) here if needed
+
+echo "App is running at http://localhost:5000"

stop-app.sh

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+#!/bin/bash
+
+# Stop the Flask app container
+echo "Stopping Flask app container..."
+docker stop flask-app
+
+# Optionally, stop other services like the database here
+
+echo "App stopped successfully!"

testapp.py

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+from flask import Flask, render_template, request
+
+app = Flask(__name__)
+
+@app.route('/', methods=['GET', 'POST'])
+def home():
+    if request.method == 'POST':
+        college_name = request.form['college_name']
+        student_name = request.form['student_name']
+        course_name = request.form['course_name']
+        year_of_study = request.form['year_of_study']
+        
+        return f"College: {college_name}, Student: {student_name}, Course: {course_name}, Year: {year_of_study}"
+    
+    return '''
+        <form method="POST">
+            College Name: <input type="text" name="college_name"><br>
+            Student Name: <input type="text" name="student_name"><br>
+            Course Name: <input type="text" name="course_name"><br>
+            Year of Study: <input type="text" name="year_of_study"><br>
+            <input type="submit" value="Submit">
+        </form>
+    '''
+
+if __name__ == "__main__":
+    app.run(debug=True, host="0.0.0.0", port=5000)  # This allows the app to run inside the container