Docker - Swarm
You want to update a running Docker service with zero downtime. Which orchestration feature helps achieve this?
You want to update a running Docker service with zero downtime. Which orchestration feature helps achieve this?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand zero downtime update
Zero downtime means the app stays available while updating containers.Step 2: Identify orchestration feature
Rolling updates replace containers one by one, keeping service live during update.Step 3: Eliminate wrong options
Stopping all containers causes downtime, rebuilding images alone doesn't update running service, and single container lacks redundancy.Final Answer:
Rolling updates that replace containers gradually -> Option BQuick Check:
Rolling updates = zero downtime updates [OK]
Quick Trick: Use rolling updates for zero downtime service changes [OK]
Common Mistakes:
- Stopping all containers causes downtime
- Thinking image rebuild updates running service
- Using single container lacks high availability
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