SohilP25 / learn-render

Flask "Hello World" Dockerized Application

This repository contains a simple Flask "Hello World" application that can be containerized using Docker. The Flask application is configured to read an environment variable to greet users.

Prerequisites

• Python 3.9+
• Docker

Flask Application

The Flask application (app.py) serves a greeting message. By default, it will greet "World", but you can customize the greeting message using the GREETING environment variable.

Docker

A Dockerfile is provided to containerize the application.

Building the Docker Image

To build the Docker image, navigate to the directory containing the Dockerfile and run:

docker build -t flask-hello-world .

This command builds the Docker image and tags it as flask-hello-world.

Running the Docker Container

To run the container and serve the Flask application:

docker run -p 5000:5000 -e GREETING='Docker World' flask-hello-world

The application will be accessible at http://localhost:5000.

Pushing to Docker Hub

To push the image to Docker Hub, follow these steps:

1. Login to Docker Hub:

   docker login

2. Tag Your Image:

   Replace myusername with your Docker Hub username:

   docker tag flask-hello-world myusername/my-flask-app:latest

3. Push the Image:

   docker push myusername/my-flask-app:latest

4. Your image will now be available publicly on Docker Hub.

Conclusion

This repository offers a quick way to containerize a simple Flask application and push it to Docker Hub. Always remember to avoid including any sensitive data in your Docker images and always follow best practices for Docker and Flask applications.