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In Docker Swarm, what is the key advantage of using a canary deployment strategy?

easy📝 Conceptual Q1 of 15
Docker - Production Patterns

In Docker Swarm, what is the key advantage of using a canary deployment strategy?

AIt instantly replaces all containers with the new version
BIt allows gradual rollout of new versions to detect issues early
CIt disables the service during the update to prevent downtime
DIt automatically scales the service to zero before updating
Step-by-Step Solution
Solution:

  1. Step 1: Understand Canary Deployment

    Canary deployment gradually rolls out new versions to a subset of users or containers.

  2. Step 2: Identify the Advantage

    This gradual rollout helps detect issues early without impacting all users.

  3. Final Answer:

    It allows gradual rollout of new versions to detect issues early -> Option B

  4. Quick Check:

    Gradual rollout is safer than instant replacement [OK]
Quick Trick: Canary deployment means gradual rollout to catch errors early [OK]
Common Mistakes:
  • Thinking canary deployment replaces all containers at once
  • Assuming service is disabled during update
  • Confusing canary with blue-green deployment

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