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What is the main goal of a canary deployment in Docker?

easy📝 Conceptual Q11 of 15
Docker - Production Patterns

What is the main goal of a canary deployment in Docker?

ATo update a small number of containers first to reduce risk
BTo update all containers at once for faster deployment
CTo delete old containers before deploying new ones
DTo run containers without any updates
Step-by-Step Solution
Solution:

  1. Step 1: Understand canary deployment purpose

    Canary deployment updates only a few containers initially to test changes safely.

  2. Step 2: Compare options

    Only To update a small number of containers first to reduce risk describes updating a small number of containers to reduce risk, which matches the canary deployment goal.

  3. Final Answer:

    To update a small number of containers first to reduce risk -> Option A

  4. Quick Check:

    Canary deployment = update few containers first [OK]
Quick Trick: Canary means small test update first, not all at once [OK]
Common Mistakes:
  • Thinking canary updates all containers simultaneously
  • Confusing canary with blue-green deployment
  • Assuming canary deletes old containers immediately

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