You want to update a Docker service with 10 replicas using rolling updates. You want to update 3 containers at a time and wait 5 seconds between batches. Which command correctly achieves this?

hard📝 Workflow Q15 of 15

Docker - Swarm

Adocker service update --image myapp:v2 --update-parallelism 3 --update-delay 5s myservice

Bdocker service update --image myapp:v2 --update-parallelism 5 --update-delay 3s myservice

Cdocker service update --image myapp:v2 --update-parallelism 10 --update-delay 0s myservice

Ddocker service update --image myapp:v2 --update-delay 5s myservice

Step-by-Step Solution

Solution:

Step 1: Match update-parallelism to batch size
To update 3 containers at a time, use --update-parallelism 3.
Step 2: Set delay between batches
To wait 5 seconds between batches, use --update-delay 5s.
Step 3: Verify full command
Combining these with the image and service name gives the correct command.
Final Answer:
docker service update --image myapp:v2 --update-parallelism 3 --update-delay 5s myservice -> Option A
Quick Check:
Parallelism 3 + delay 5s = correct rolling update command [OK]

Quick Trick: Use --update-parallelism for batch size and --update-delay for wait time [OK]

Common Mistakes:

Using wrong parallelism number
Omitting update-parallelism option
Setting delay but not parallelism

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You want to update a Docker service with 10 replicas using rolling updates. You want to update 3 containers at a time and wait 5 seconds between batches. Which command correctly achieves this?

Step 1: Match update-parallelism to batch size

Step 2: Set delay between batches

Step 3: Verify full command

Final Answer:

Quick Check:

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