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You want to combine canary deployment with automatic rollback on failure. Which Docker service update options should you use?

hard📝 Application Q9 of 15
Docker - Production Patterns

You want to combine canary deployment with automatic rollback on failure. Which Docker service update options should you use?

A--update-parallelism with --update-failure-action rollback
B--update-delay with --rollback
C--rollback only
D--update-parallelism with --rollback
Step-by-Step Solution
Solution:

  1. Step 1: Identify rollback trigger option

    --update-failure-action rollback triggers rollback on failure.

  2. Step 2: Combine with parallelism for canary

    Use --update-parallelism to control batch size during canary deployment.

  3. Final Answer:

    --update-parallelism with --update-failure-action rollback -> Option A

  4. Quick Check:

    Rollback on failure needs update-failure-action rollback [OK]
Quick Trick: Use update-failure-action rollback for auto rollback [OK]
Common Mistakes:
  • Using --rollback alone does not auto trigger
  • Confusing update-delay with rollback
  • Missing failure action option

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