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wiki/concepts/Cluster-Autoscaler.md
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wiki/concepts/Cluster-Autoscaler.md
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title: "Cluster Autoscaler"
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type: concept
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tags: [Kubernetes, Auto-Scaling, GKE, EKS]
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sources: []
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last_updated: 2026-04-19
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---
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## Definition
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Cluster Autoscaler 是 Kubernetes 社区的自动扩缩容组件,与 Karpenter 功能类似但实现方式不同。
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## Key Differences from Karpenter
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- 不直接与 EC2 Fleet API 通信,依赖 Kubernetes scheduler
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- 无原生 Spot 中断处理,需要额外组件(如 Node Termination Handler)
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- 节点管理通过 Node Groups 而非原生资源
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- 不支持工作负载放置的细粒度控制
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## Use Cases
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- GKE:Google Kubernetes Engine 原生支持
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- AKS:Azure Kubernetes Service 支持
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- EKS:需要额外配置
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## Related Concepts
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- [[Karpenter]]:Cluster Autoscaler 的替代方案
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- [[Node-Pools]]:类似 Karpenter 的节点管理概念
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## Aliases
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- Kubernetes Cluster Autoscaler
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- CA
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