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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?