Solution:Step 1: Understand --update-parallelism effectThe option --update-parallelism 2 means update 2 containers at once.Step 2: Apply to service updateDocker updates 2 containers to image v2, then moves to next 2, until all are updated.Final Answer:Two containers update at a time to v2 until all

[Solved] Given the command:docker service update --image myapp:v2 --update-parallelism 2 myserviceWhat will happen during this update? | Docker

Docker - Swarm

Given the command:

docker service update --image myapp:v2 --update-parallelism 2 myservice

What will happen during this update?

AAll containers of myservice update at once to v2

BTwo containers update at a time to v2 until all are updated

COnly two containers update and the rest stay on old version

DThe service rolls back to the previous version

Step-by-Step Solution

Solution:

Step 1: Understand --update-parallelism effect
The option --update-parallelism 2 means update 2 containers at once.
Step 2: Apply to service update
Docker updates 2 containers to image v2, then moves to next 2, until all are updated.
Final Answer:
Two containers update at a time to v2 until all are updated -> Option B
Quick Check:
--update-parallelism 2 means update 2 containers at once [OK]

Quick Trick: Parallelism number controls how many containers update simultaneously [OK]

Common Mistakes:

Thinking all containers update simultaneously
Believing only two containers update permanently
Confusing update with rollback

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Given the command:

Step 1: Understand --update-parallelism effect

Step 2: Apply to service update

Final Answer:

Quick Check:

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