Kubernetes - Production Best Practices
You want to design a Kubernetes HA cluster that can tolerate failure of two control plane nodes. How many control plane nodes should you deploy at minimum?
You want to design a Kubernetes HA cluster that can tolerate failure of two control plane nodes. How many control plane nodes should you deploy at minimum?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand quorum in etcd for HA
etcd requires majority quorum to operate; to tolerate 2 failures, majority must remain.Step 2: Calculate minimum nodes for 2 node failure tolerance
Minimum nodes = 2 * failures + 1 = 2*2 + 1 = 5 nodes.Final Answer:
5 -> Option BQuick Check:
Nodes needed = 2*failures + 1 = 5 [OK]
Quick Trick: Use formula 2*faults+1 for control plane nodes [OK]
Common Mistakes:
- Choosing 3 nodes which tolerate only 1 failure
- Assuming 2 nodes can tolerate 2 failures
- Picking 4 nodes which is insufficient for 2 failures
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