Docker 101

  • Doctoral Researcher @ Institute for Internet Security
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Kevin Wittek          @kiview

Why Containers?

  • Development
  • Deployment
  • Operations
  • Playing

What are Containers?

Container vs VM

Container + VM = <3

Kernel Space vs User Space

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

Container System Calls

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

Kernel Subsystems

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

VM vs Containers reloaded

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

Kernel Namespaces

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

Namespaces in Action

https://rhelblog.redhat.com/2015/07/29/architecting-containers-part-1-user-space-vs-kernel-space/

Docker Architecture

Layered Filesystem

Volumes & Mounts

docker container run -ti -v /home/myuser:/home/dockeruser:ro ubuntu:latest


docker container run -v postgres_data:/var/lib/postgresql/data postgres
docker volume ls
docker volume inspect postgres_data

Docker Networking
(Bridge)

Docker-Compose

version: '3.3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
volumes:
    db_data: {}

Docker Swarm Mode

Portainer

docker run -d \
  -p 9000:9000 \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v portainer_data:/data \
  portainer/portainer

Let's get hacking!

https://training.play-with-docker.com/ops-s1-hello/

https://training.play-with-docker.com/beginner-linux/

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