working_with_docker_container.md

Working with Docker container

A Docker container image is a lightweight, standalone, executable package of software that includes everything needed 
to run an application: code, runtime, system tools, system libraries and settings

Explore here: https://www.docker.com/resources/what-container/#:~:text=A%20Docker%20container%20image%20is,tools%2C%20system%20libraries%20and%20settings.

Docker Compose

Compose is a tool for defining and running multi-container Docker applications. 
With Compose, you use a YAML file to configure your application’s services. 
Then, with a single command, you create and start all the services from your configuration.

Explore here: https://docs.docker.com/compose/

Exercise

• Create a new docker file.

  FROM python:3.10.2-alpine3.15
  # Create directories  
  RUN mkdir -p /root/workspace/src
  COPY ./web_scraping_sample.py  /root/workspace/src
  # Switch to project directory
  WORKDIR /root/workspace/src
  # Install required packages
  RUN pip install --upgrade pip
  RUN pip install requests bs4 html5lib
  

• Build docker image

  docker build --no-cache --network=host ./ -t workshop1 
  

• Create a docker-compose file.

  • Filename: docker-compose.yml

  version: "3"
  services:
   python_service:
     build:
       context: ./
       dockerfile: Dockerfile
     image: workshop1
     container_name: workshop_python_container
     stdin_open: true #  docker attach container_id
     tty: true
     ports:
      - "8000:8000"
     volumes:
      - .:/app
  

• Get the containers up.

   docker-compose up -d
  

• Login to the container.

   docker exec -it workshop_python_container sh
  

• Run the script for web scrapping inside the container.

   python web_scraping_sample.py