intermediate~4h
Scaling: HPA, VPA & Cluster Autoscaler
Three independent, complementary autoscaling mechanisms. HPA changes replica count based on metrics. VPA changes per-Pod CPU/memory allocation. Cluster Autoscaler changes node count. They operate at P
Learning objectives
- Explain what metric the Horizontal Pod Autoscaler actually reacts to, and how it decides on a new replica count.
- Explain why HPA and VPA are generally not combined on the same metric for the same workload.
- Explain what the Cluster Autoscaler does differently from HPA/VPA, and when it actually gets triggered.
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Scaling: HPA, VPA & Cluster Autoscaler