KubeFM Replacing StatefulSets with a custom Kubernetes operator in our Postgres cloud platform, with Andrew Charlton
Apr 22, 2025
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StatefulSets' Limits for Postgres
- Kubernetes StatefulSets are useful for simple stateful apps but lack the context for sophisticated database needs like primary-replica roles and backups.
- When dealing with high availability Postgres clusters, StatefulSets' limitations force you to seek custom solutions for intelligent management.
Operators Add Context Beyond StatefulSets
- Kubernetes operators extend control by adding context to manage complex, stateful database workflows without disruption.
- Operators can intelligently sequence actions, like restarting replicas before primaries, avoiding downtime caused by StatefulSets.
StatefulSet Challenges With Pods and Volumes
- Pod ordering and immutable volume templates in StatefulSets cause operational challenges like unnecessary failovers and difficulty resizing volumes.
- Complex workflows like downsizing large database volumes require stepping outside StatefulSets' assumptions to avoid disruption.