Docker - Swarm
What will happen if you deploy a Docker service with 3 replicas on a Swarm with 2 nodes?
What will happen if you deploy a Docker service with 3 replicas on a Swarm with 2 nodes?
medium📝 Command Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand replica distribution in Swarm
Swarm tries to spread replicas evenly across nodes.Step 2: Apply to 3 replicas and 2 nodes
Two nodes will get 2 and 1 replicas respectively to balance load.Final Answer:
Swarm schedules 2 replicas on one node and 1 on the other -> Option BQuick Check:
Replica distribution = Balanced across nodes [OK]
Quick Trick: Swarm balances replicas across available nodes [OK]
Common Mistakes:
- Thinking Swarm fails if replicas > nodes
- Assuming all replicas run on one node
Master "Swarm" in Docker
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