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k8s-request-limit-best-practices

Kubernetes Best Practices - Resource Requests and Limits
https://www.youtube.com/watch?v=xjpHggHKm78

  • 基于 request 调度；
  • 可以设置 namespace 级别限制和默认值；
  • 除非科学计算应用一般不建议 cpu request 超过1000m；
  • 内存不可压缩，扩展超 request 不到 limit 后， k8 会 reschedule 低优先级 pod 来释放空间从而满足请求

cpu request / limit

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Pod scheduling is based on requests. A Pod is scheduled to run on a Node only if the Node has enough CPU resources available to satisfy the Pod CPU request.

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The CPU resource is measured in CPU units. One CPU, in Kubernetes, is equivalent to:

  • 1 AWS vCPU
  • 1 GCP Core
  • 1 Azure vCore
  • 1 Hyperthread on a bare-metal Intel processor with Hyperthreading