Images

• Linux based
• Layerer
• Encapsulated

Containers

• Based on images
• Required to run
• Might link to other containers
• Cattle computing 🐮

Volumes

• Persist state between containers
• Gems, Database, node_modules, etc
• File synchronization for development

Network

• Containers in a network together...
• ... are in a network together
• Useful for dev-prod parity in advanced cases

Tools 🔧🔨🔩⚙️

• Docker hub
• Docker Compose
• Docker Cloud
• Codefresh
• Codeship Pro
• many many others