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Which Docker service update flag specifies how many containers are updated at once during a rolling update?

easy📝 Syntax Q3 of 15
Docker - Production Patterns

Which Docker service update flag specifies how many containers are updated at once during a rolling update?

A--rollback
B--update-delay
C--replicas
D--update-parallelism
Step-by-Step Solution
Solution:

  1. Step 1: Review Docker update flags

    --update-parallelism controls the number of containers updated simultaneously.

  2. Step 2: Differentiate from other flags

    --update-delay sets wait time between batches, --replicas sets total containers, --rollback triggers rollback.

  3. Final Answer:

    --update-parallelism -> Option D

  4. Quick Check:

    Parallelism means how many update at once [OK]
Quick Trick: Parallelism controls batch size in updates [OK]
Common Mistakes:
  • Confusing --update-delay with parallelism
  • Using --replicas to control update batch size
  • Assuming --rollback controls update speed

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