Guides

Ensure that the admission control plugin EventRateLimit is set (API Server)

Limit the rate at which the API server accepts requests. Using EventRateLimit admission control enforces a limit on the number of events that the API Server will accept in a given time slice. In a large multi-tenant cluster, there might be a small percentage of misbehaving tenants which could have a significant impact on the performance of the cluster overall. Hence, it is recommended to limit the rate of events that the API server will accept.

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Risk Level: Low
Cloud Entity: Pods
CloudGuard Rule ID: D9.K8S.NET.15
Covered by Spectral: Yes
Category: Compute

GSL LOGIC

KubernetesPod where labels contain [value='kube-apiserver'] and namespace = 'kube-system' should have spec.containers with [parsedArgs contain [key like 'enable-admission-plugins' and value like '%EventRateLimit%']]

REMEDIATION

Follow the Kubernetes documentation and set the desired limits in a configuration file. Then, edit the API server pod specification file
$apiserverconf and set the below parameters.
--enable-admission-plugins=...,EventRateLimit,...
--admission-control-config-file=<path/to/configuration/file>

References

  1. https://kubernetes.io/docs/admin/kube-apiserver/
  2. https://kubernetes.io/docs/admin/admission-controllers/#eventratelimit
  3. https://github.com/staebler/community/blob/9873b632f4d99b5d99c38c9b15fe2f8b93d0a746/contributors/design-proposals/admission_control_event_rate_limit.md

Pods

Pods are the smallest deployable units of computing that can be created and managed in Kubernetes.A Pod is a group of one or more containers (such as Docker containers), with shared storage/network, and a specification for how to run the containers.

Compliance Frameworks

  • CIS Kubernetes Benchmark v1.20
  • CIS Kubernetes Benchmark v1.23
  • CIS Kubernetes Benchmark v1.24
  • CIS Kubernetes Benchmark v1.4.0
  • CIS Kubernetes Benchmark v1.5.1
  • CIS Kubernetes Benchmark v1.6.1
  • Kubernetes NIST.SP.800-190
  • Kubernetes v.1.13 CloudGuard Best Practices
  • Kubernetes v.1.14 CloudGuard Best Practices

Updated about 1 year ago