You want to deploy a service with a constraint to run only on nodes labeled role=worker. Which option correctly applies this constraint?

hard📝 Workflow Q8 of 15

Docker - Swarm

You want to deploy a service with a constraint to run only on nodes labeled role=worker. Which option correctly applies this constraint?

Adocker service create --name app --filter 'role=worker' nginx

Bdocker service create --name app --label 'node.role=worker' nginx

Cdocker service create --name app --constraint 'node.labels.role == worker' nginx

Ddocker service create --name app --node-role worker nginx

Step-by-Step Solution

Solution:

Step 1: Understand constraint syntax
Constraints use --constraint with expression like 'node.labels.key == value'.
Step 2: Evaluate options
Only docker service create --name app --constraint 'node.labels.role == worker' nginx uses correct syntax; others misuse labels, filters, or flags.
Final Answer:
docker service create --name app --constraint 'node.labels.role == worker' nginx -> Option C
Quick Check:
Use --constraint with node.labels for placement [OK]

Quick Trick: Use --constraint 'node.labels.key == value' to control placement [OK]

Common Mistakes:

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