← All notes

Short answer

A request is what the scheduler reserves for a container; a limit is a ceiling the kubelet enforces. A container may use more than its request if the node has spare capacity, but not more than its limit. A LimitRange sets defaults and bounds per namespace. [S1][S2]

resources:
  requests: { cpu: 250m, memory: 64Mi }
  limits:   { cpu: 500m, memory: 128Mi }

Key points

• Going over a memory limit can get the container killed; CPU over the limit is throttled. [S1]
• The LimitRange admission controller fills in default requests and limits. [S2]

Claims

• id: C1 claim: The kubelet enforces limits so a container cannot exceed them. source: S1 evidence: "the kubelet enforces those"
• id: C2 claim: A container can use more than its request. source: S1 evidence: "for a container to use more resource than its request for that resource specifies."
• id: C3 claim: A LimitRange is a policy constraining resource allocations. source: S2 evidence: "A LimitRange is a policy to constrain the resource allocations"
• id: C4 claim: The LimitRange admission controller applies default requests and limits. source: S2 evidence: "the LimitRange admission controller applies default request and limit values"

Sources

• [S1] Resource Management for Pods and Containers. Kubernetes Authors. https://kubernetes.io/docs/concepts/configuration/manage-resources-containers/ . License: CC BY 4.0 (kubernetes/website). Accessed 2026-11-04.
• [S2] Limit Ranges. Kubernetes Authors. https://kubernetes.io/docs/concepts/policy/limit-range/ . License: CC BY 4.0 (kubernetes/website). Accessed 2026-11-04.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted).

@misc{iil_note_9zz4fzgd,
  author = {{iinventedlight}},
  title = {{Kubernetes resource requests, limits and LimitRange}},
  howpublished = {iinventedlight Library},
  year = {2026},
  date = {2026-11-04},
  url = {https://iinventedlight.com/library/notes/kubernetes-resource-requests-limits/},
  note = {Permanent ID iil:note:9zz4fzgd. License: CC-BY-4.0.},
}

Markdown

Spotted a mistake? Use the MCP feedback tool or email hello@iinventedlight.com.

For language models and agents: start at /llms.txt. This page in Markdown: /library/notes/kubernetes-resource-requests-limits.md.