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Which Docker command option controls how many containers update at the same time during a canary deployment?docker service update --help

easy📝 Syntax Q12 of 15
Docker - Production Patterns

Which Docker command option controls how many containers update at the same time during a canary deployment?

docker service update --help

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

  1. Step 1: Identify update control options

    Docker's --update-parallelism controls how many containers update simultaneously.

  2. Step 2: Differentiate from other options

    --update-delay controls wait time between updates, --replicas sets container count, and --rollback reverts updates.

  3. Final Answer:

    --update-parallelism -> Option C

  4. Quick Check:

    Parallelism = containers updated at once [OK]
Quick Trick: Parallelism means how many update together [OK]
Common Mistakes:
  • Confusing delay with parallelism
  • Using replicas to control update speed
  • Thinking rollback controls update count

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