Container Lifetime & Persistent Data

• Containers are usually immutable and ephemeral
• "immutable infrastructure": only re-deploy containers, never change
  • This is the ideal scenario, but what about databases, or unique data
    • Docker gives us features to ensure these "separation of concerns"
    • This is known as "persistent data"
• Two ways:
  • Data Volumes: make special location outside of container UFS
  • Bind Mounts: link container path to host path

External links

• An introduction to immutable infrastructure
• The 12-factor app
• 12 Fractured Apps