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Databases on Kubernetes: StatefulSets Deep Dive

Running stateful databases (PostgreSQL, MySQL, Cassandra) on Kubernetes with StatefulSets, PVCs, and operators.

🎯Key Takeaways
StatefulSet = stable identity + stable storage + ordered ops
PVC per pod: data survives pod rescheduling
Database operators (Zalando, Percona) automate failover and backups

Databases on Kubernetes: StatefulSets Deep Dive

Running stateful databases (PostgreSQL, MySQL, Cassandra) on Kubernetes with StatefulSets, PVCs, and operators.

~1 min read
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What you'll learn
  • StatefulSet = stable identity + stable storage + ordered ops
  • PVC per pod: data survives pod rescheduling
  • Database operators (Zalando, Percona) automate failover and backups

StatefulSet Guarantees

StatefulSets provide: stable network identity (pod-0, pod-1, pod-N), stable persistent storage (PVC per pod survives rescheduling), ordered deployment (pod-0 before pod-1), and ordered rolling updates. Critical for leader-follower databases where pod-0 is the primary.

Key takeaways

  • StatefulSet = stable identity + stable storage + ordered ops
  • PVC per pod: data survives pod rescheduling
  • Database operators (Zalando, Percona) automate failover and backups

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