[Solved] Why does this command fail?docker service update --image myapp:v2 --update-parallelism 0 myservice — Ans: --update-parallelism cannot be zero; must be at least 1 | Docker

Docker - Swarm

Why does this command fail?

docker service update --image myapp:v2 --update-parallelism 0 myservice

AService name missing

BImage version v2 does not exist

C--update-parallelism cannot be zero; must be at least 1

DCommand syntax is correct; no failure

Step-by-Step Solution

Solution:

Step 1: Check --update-parallelism value constraints
0 is NOT valid; it must be at least 1 to specify how many containers update simultaneously.
Step 2: Verify other command parts
Image and service name are present; syntax is correct except for invalid parallelism value.
Final Answer:
--update-parallelism cannot be zero; must be at least 1 -> Option C
Quick Check:
--update-parallelism must be >=1 [OK]

Quick Trick: --update-parallelism must be 1 or more; zero is invalid [OK]

Common Mistakes:

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Why does this command fail?