Docker RC Workshop

Agenda

• Containerization Overview
  • What is a container? (VM=house, Container=apartment)
  • Why should you use containers?
    • Speed
    • Reproducibility
  • Docker vs. Containerization (Kleenex vs. Tissue)
  • Future: Rancher Desktop
• Running your first container

  docker run docker/whalesay:latest cowsay Hello  # Run docker/whalesay container
  docker ps                                       # Display running containers
  docker ps -a                                    # Display all containers
  docker rm -f $(docker ps -a -q)                 # WARNING: Delete all containers
  docker run --rm docker/whalesay cowsay Hello    # Delete container after running 
  docker run --name myubuntu -it ubuntu bash      # Run an interactive ubuntu container
  docker start myubuntu
  docker exec -ti myubuntu bash
  docker stop myubuntu
  docker rm myubuntu 

• Exposing Ports, Running in Background, and Accessing logs

  docker run --name mynginx -d -p 80:80 --restart unless-stopped nginx:alpine
  docker logs -f mynginx
  docker ps
  docker rm -f mynginx

• Mounting storage

  docker run --rm -p 80:80 -v $PWD/html:/usr/local/apache2/htdocs httpd:alpine

• Passing environment variables

  docker run --rm -p 80:80 -v $PWD/html:/var/www/html -e MYVAR=hello php:7-apache

• Finding container images: Docker Hub

  docker image ls                        # List local images
  docker image rm httpd:alpine           # Remove local image
  docker image rm $(docker image ls -q)  # Remove all local images

• Building docker images

  echo 'Hello World!' > html/index.html
  docker build -t mynginx:v1.0.0 .
  docker image ls
  docker run --rm -it -p 80:80 mynginx:v1.0.0

• Archiving/loading images

  docker save -o mynginx-v1.0.0 mynginx:v1.0.0
  docker image rm mynginx:v1.0.0
  docker image ls
  docker load -i mynginx-v1.0.0
  docker image ls

• Networks

  docker network create todo-app
  docker network ls

• Multiple containers

  docker pull mysql:5.7
  docker pull node:12-alpine
  docker run -d --name todo-mysql --network todo-app -v $PWD/todo-mysql-data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=secret -e MYSQL_DATABASE=todos mysql:5.7
  docker exec -it todo-mysql mysql -p # Password: secret
    SHOW DATABASES;
  docker run --rm -it --network todo-app alpine
    apk update
    apk add bind-tools
    dig todo-mysql
  docker run -d --name todo-app -p 3000:3000 -w /app -v $PWD/app:/app --network todo-app -e MYSQL_HOST=todo-mysql -e MYSQL_USER=root -e MYSQL_PASSWORD=secret -e MYSQL_DB=todos node:12-alpine sh -c "yarn install && yarn run dev"
  # Goto: http://localhost:3000/
  docker exec -it todo-mysql mysql -p
  docker rm -f todo-app todo-mysql
  docker network rm todo-app

• Docker compose

  docker-compose up
  docker ps -a
  docker-compose down
  docker-compose up -d
  docker-compose ps
  docker-compose logs -f
  docker-compose down

• Research containers

  docker pull tensorflow/tensorflow:latest-jupyter
  docker pull rocker/rstudio
  docker run -it --rm -v $PWD/notebooks:/tf/notebooks -p 8888:8888 tensorflow/tensorflow:latest-jupyter
  docker run -it --rm -v $PWD/rstudio:/home/rstudio/rstudio -p 8787:8787 -e DISABLE_AUTH=true rocker/rstudio

• What does the future hold?
• Questions?