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Interactive Explainer

Kubernetes High Availability Design

Multi-master control plane, pod disruption budgets, anti-affinity rules, and topology-aware routing for HA Kubernetes.

🎯Key Takeaways
3 control plane nodes = quorum for etcd
PodDisruptionBudget: min available replicas during disruptions
topologySpreadConstraints: distribute pods across zones

Kubernetes High Availability Design

Multi-master control plane, pod disruption budgets, anti-affinity rules, and topology-aware routing for HA Kubernetes.

~1 min read
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What you'll learn
  • 3 control plane nodes = quorum for etcd
  • PodDisruptionBudget: min available replicas during disruptions
  • topologySpreadConstraints: distribute pods across zones

K8s HA Requirements

HA Kubernetes requires: 3+ control plane nodes (etcd quorum tolerates 1 failure), load balancer in front of API servers, worker node redundancy across availability zones, PodDisruptionBudgets (prevent all replicas evicted during upgrades), pod anti-affinity (spread replicas across nodes), topologySpreadConstraints (spread across AZs).

Key takeaways

  • 3 control plane nodes = quorum for etcd
  • PodDisruptionBudget: min available replicas during disruptions
  • topologySpreadConstraints: distribute pods across zones

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