Docker

• — What is docker?
  • — Light weight virtual machines (containers) from deterministic image description that run on all environments the same way
• — Components
  • — Docker image
    • — Description of what is inside a container
    • — An image runs always the same way
    • — Layers is a way of reusing other images
  • — Container
    • — A running instance of a Docker image
  • — Docker runtime
    • — Runs containers
    • — Provides ports and volumes to containers
  • — Port
    • — A network port on the container mapped to a port in the host OS
  • — Volumes
    • — Make file system independant of the containres
    • — Volumes can outlast containers, making deleting and creating containers
  • — Image registry
    • — A repository for versioned Images
  • — Docker Client
• — Why is this lightweight?
  • — A container is mapped to an OS process, unlike virtual machiens
• — What other things does this enable?
  • — Container orchestrations
    • — Docker Compose and Kubernetes
  • — DevOps benefits
  • — Cloud computing