Dockerizing the Python app and running it on App Server

1. Create a Dockerfile

  # Use any Python image as the base image

  FROM python:3.8-slim

  # Set the working directory

  WORKDIR /app

  # Copy the requirements.txt file

  COPY src/requirements.txt .

  # Install dependencies

  RUN pip install --no-cache-dir -r requirements.txt

  # Copy the application code

  COPY src/ .

  # Expose port 3002

  EXPOSE 3002

  # Run the app

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

• FROM python:3.8-slim: This specifies a lightweight Python 3.8 image.
• WORKDIR /app: Sets the working directory inside the container.

• COPY src/requirements.txt .: Copies the requirements.txt file into the container.
• RUN pip install --no-cache-dir -r requirements.txt: Installs the dependencies listed in requirements.txt.
• COPY src/ . : Copies the app source code from the src directory.
• EXPOSE 3002: Exposes port 3002.
• CMD ["python", "server.py"]: Runs the Python script server.py when the container starts.

2. Build the Docker Image and tags it as nautilus/python-app.

sudo docker build -t nautilus/python-app .

3. Create and Run the Docker Container

• Create and Run a Container Named pythonapp_nautilus:

  sudo docker run -d --name pythonapp_nautilus -p 8097:3002 nautilus/python-app        

• -d: Runs the container in detached mode.
• --name pythonapp_nautilus: Names the container pythonapp_nautilus.
• -p 8097:3002: Maps port 8097 on the host to port 3002 in the container.

4. Test the Application

curl https://localhost:8097/

Try it yourself code repo https://github.com/shubhamksawant/python_app.git

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