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Concepts & Architecture

Pro

  • Single Deployment Unit
  • Encapsulates
    • Application
    • Dependencies
    • Libraries
    • Binaries
    • Configuration files
  • Immutable using stacked images
  • Lightweight
  • Fast
  • Cost effective
  • Enables Continuous Integration & Continuous Deployment
  • Easy to integrate in Testing, Staging, Production

Cons

  • Shared the kernel
  • Less flexibility in operating systems
  • The challenge is networking

Architecture

Docker Deamon

  • Uses an "Execution Driver" runc to create Container
  • Isolates Kernel-Features
    • cgroups for resource management
    • namespaces for container isolation
    • Union File System (UFS) for image file layers
  • Server via tcp://, unix://, http://, https://

Docker Client

  • docker, docker-machine and every Docker-API client
  • Consumer via tcp://, unix://, http://, https://
  • Supports different drivers (VirtualBox, Digital Ocean, AWS, Azure, etc.)

Docker Registry

Docker Images

  • Images are Layers docker history tutum/hello-world:latest
  • Every layer is (naive) cached (is in cache AND same command in stack)

Docker Containers

  • Run from Base Images
  • Build from Dockerfile or docker-compose.yml

TOOLS

  • Kitematic - UI for Windows and OSX
  • Compose - Build and Run multiple depended Containers
  • Swarm - Service Orchestration
  • Kubernetes - Service Orchestration