docker

Docker desktop alternative  = minikube

• image: an executable package that includes everything needed to run an application–the code, a runtime, libraries, environment variables, and configuration files
• container: running image instance
• docker-compose.yml: defines how Docker containers should behave in production

terminal

docker ps -a // list all docker containers
docker info // show docker info
docker image ls --all // list all images
docker build -t imagename . // build a docker image
docker run -p 4000:80 imagename // run the image on localhost:4000 

Dockerfile

# Use an official Python runtime as a parent image
FROM python:2.7-slim

# Set the working directory to /app
WORKDIR /app

# Copy the current directory contents into the container at /app
COPY . /app

# Install any needed packages specified in requirements.txt
RUN pip install --trusted-host pypi.python.org -r requirements.txt

# Make port 80 available to the world outside this container
EXPOSE 80

# Define environment variable
ENV NAME World

# Run app.py when the container launches
CMD ["python", "app.py"]

docker-compose.yml

version: "3"
services:
  web:
    # replace username/repo:tag with your name and image details
    image: username/repo:tag
    deploy:
      replicas: 5
      resources:
        limits:
          cpus: "0.1"
          memory: 50M
      restart_policy:
        condition: on-failure
    ports:
      - "4000:80"
    networks:
      - webnet
networks:
  webnet: