What is a Dockerfile?
Dockerfile is a text document that contains instructions to build a Docker image. It defines the environment and steps needed to package an application into a container.
Step 1: Clone the GitHub Repository
I’ve already written a simple Python app using Flask. You can start by cloning the repo:
First, fork the repository to your GitHub account by clicking the “Fork” button in the top right of the repo page.
Then clone your forked repository to your local.
below is the example command to clone repository to the local
git clone https://github.com/vishamyatech/python-web-application.git
after cloning : cd python-web-application
Step 2: Create a Dockerfile
If you were starting from scratch, you’d use the command below to create a new Dockerfile:
touch Dockerfile
This command creates an empty file named Dockerfile in your current directory.
However, you don’t need to do this manually — the Dockerfile is already present in the GitHub repository you cloned or forked.
You can open it and review or edit the content if needed.
Here’s the complete Dockerfile content for reference (you can copy and reuse it if you’re creating your own from scratch):
# Use a base image
FROM python:3.9-slim
# Set the working directory inside the container
WORKDIR /app
# Copy the local files into the container
COPY . .
# Define the command to run the application
CMD ["python", "app.py"]
Step 5: Build the Docker Image
docker build -t my-python-app .
The above step will create docker image named my-python-app
Step 6: Run the Docker Container
docker run my-python-app
Now start the container using:
docker run -d -p 5000:5000 my-python-app
click on the below link , you will see "Hello, World! Welcome to Docker + Python Web App."
Want to Learn More About Docker? checkout below blog