The Container Image

Let's create a Docker image for our to-do application. We start by creating a Dockerfile. Use the following command to create the file:

cat << EOF > $HOME/todo/app/Dockerfile
# Use an official Python runtime as a parent image
FROM python:3.12-slim
# Set the working directory to /app
WORKDIR /app
# Copy the current directory contents into the container at /app
COPY . .
# Install any needed packages specified in requirements.txt
RUN pip install --no-cache-dir -r requirements.txt
# Make port 5000 available to the world outside this container
EXPOSE 5000
# Define environment variable
CMD ["python", "app.py"]
EOF

Create a .dockerignore file to exclude unnecessary files from the Docker build context:

cat << EOF > $HOME/todo/app/.dockerignore
.git
.gitignore
__pycache__
venv
tests
Dockerfile
EOF

Install Docker:

# Download the Docker installation script (V29)
curl -fsSL https://get.docker.com -o install-docker.sh
# Run the Docker installation script
sh install-docker.sh --version 29
# Remove the installation script
rm install-docker.sh

Build the image using the following command:

docker build -t todo-app $HOME/todo/app

Helm in Practice

Designing, Deploying, and Operating Kubernetes Applications at Scale

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