Describe the workflow in Docker

Docker is a platform for creating, delivering, and running applications in isolated containers. The typical workflow with Docker is as follows:

1. Creating a Dockerfile — describes the image that contains all dependencies and configurations for the application.
2. Building the image using the docker build command.
3. Running a container from the image using docker run. The container is isolated from the system but can access necessary resources.
4. Managing containers — stopping, restarting, deleting.
5. Working with Docker Hub or a private registry — uploading and downloading images.

Example Dockerfile for a simple Python application:

FROM python:3.9-slim
WORKDIR /app
COPY requirements.txt ./
RUN pip install -r requirements.txt
COPY . .
CMD ["python", "app.py"]

Thus, Docker allows packaging an application and its environment into a single portable container.