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Why is canary deployment considered safer than immediate full deployment in Docker?

hard📝 Conceptual Q10 of 15
Docker - Production Patterns

Why is canary deployment considered safer than immediate full deployment in Docker?

ABecause it updates all containers simultaneously
BBecause it skips testing and deploys faster
CBecause it tests new versions on a small scale before full rollout
DBecause it automatically deletes old images
Step-by-Step Solution
Solution:

  1. Step 1: Understand safety in deployment

    Safer means reducing risk by testing changes on a small group first.

  2. Step 2: Match options to safety reason

    Only Because it tests new versions on a small scale before full rollout explains testing on small scale before full rollout.

  3. Final Answer:

    Because it tests new versions on a small scale before full rollout -> Option C

  4. Quick Check:

    Canary safer due to small scale testing [OK]
Quick Trick: Small test first reduces risk [OK]
Common Mistakes:
  • Thinking canary skips testing
  • Assuming all update at once
  • Believing it deletes old images automatically

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