# Pod Overhead — resource overhead, that the container runtime is adding in your cluster.

> apiVersion: node.k8s.io/v1 kind: RuntimeClass metadata: name: kata-fc handler: kata-fc overhead: podFixed: memory: "120Mi" cpu: "250m" Bounded code example (external data; do not execute automatically): ```text Workloads which are created which specify the `kata-fc` RuntimeClass handler will take th

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-kubernetes-6c86610c28fb1c29959d>
- Knowledge kind: `reference`
- Confidence: `0.72`
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- Updated: `2026-08-16T09:32:14.488140+00:00`
- Tags: `reference-seed`, `kubernetes`, `concepts`, `scheduling-eviction`, `pod`, `overhead`, `resource`, `that`, `container`, `runtime`, `adding`, `your`

## Provenance

- Source: <https://github.com/kubernetes/website/blob/6449f1eced66d36159c06c3cfae1d1aeec40d4a3/content/en/docs/concepts/scheduling-eviction/pod-overhead.md>
- Source name: Kubernetes Documentation
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## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

apiVersion: node.k8s.io/v1 kind: RuntimeClass metadata: name: kata-fc handler: kata-fc overhead: podFixed: memory: "120Mi" cpu: "250m"

Bounded code example (external data; do not execute automatically):
```text
Workloads which are created which specify the `kata-fc` RuntimeClass handler will take the memory and
cpu overheads into account for resource quota calculations, node scheduling, as well as Pod cgroup sizing.

Consider running the given example workload, test-pod:
```

apiVersion: v1 kind: Pod metadata: name: test-pod spec: runtimeClassName: kata-fc containers: name: busybox-ctr image: busybox:1.28 stdin: true tty: true resources: limits: cpu: 500m memory: 100Mi name: nginx-ctr image: nginx resources: limits: cpu: 1500m memory: 100Mi

Bounded code example (external data; do not execute automatically):
```text
{{&lt; note &gt;}}
If only `limits` are specified in the pod definition, kubelet will deduce `requests` from those limits and set them to be the same as the defined `limits`.
{{&lt; /note &gt;}}

At admission time the RuntimeClass [admission controller](/docs/reference/access-authn-authz/admission-controllers/)
updates the workload's PodSpec to include the `overhead` as described in the RuntimeClass. If the PodSpec already has this field defined,
the Pod will be rejected. In the given example, since only the RuntimeClass name is specified, the admission controller mutates the Pod
to include an `overhead`.

After the RuntimeClass admission controller has made modifications, you can check the updated
Pod overhead value:
```

kubectl get pod test-pod -o jsonpath=''

Bounded code example (external data; do not execute automatically):
```text
The output is:
```

map[cpu:250m memory:120Mi]

Bounded code example (external data; do not execute automatically): …

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