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Docker Interview Prep

Use this page as a revision map. Every tutorial in the Docker track already ends with interview questions — work those first, then stress-test the themes below.

How to practise

  1. Answer out loud in two minutes without notes
  2. Draw the architecture on paper or a whiteboard
  3. Name the failure mode and the first three debug commands
  4. Tie the topic to security (identity, secrets, blast radius)

High-yield themes

  • Namespaces and cgroups
  • Image layers and caching
  • Bind mount vs volume
  • Multi-stage builds
  • Registry security
  • Compose vs orchestrators

Hands-on prompts interviewers love

  • Walk through a recent lab from the track as if it were an incident
  • Compare two designs and defend a trade-off (simplicity vs resilience)
  • Explain what you would monitor after a change ships