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1.2.9 Ensure that the admission control plugin EventRateLimit is set

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Information

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. A misbehaving workload could overwhelm and DoS the API Server, making it unavailable. This particularly applies to a multi-tenant cluster, where 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.

Solution

Follow the Kubernetes documentation and set the desired limits in a configuration file.

Then, edit the API server pod specification file /etc/kubernetes/manifests/kube-apiserver.yaml and set the below parameters.

--enable-admission-plugins=...,EventRateLimit,...
--admission-control-config-file=<path/to/configuration/file>

Impact:

You need to carefully tune in limits as per your environment.

See Also

https://workbench.cisecurity.org/benchmarks/26831

Item Details

Category: SYSTEM AND SERVICES ACQUISITION

References: 800-53|SA-15, CSCv7|8.3

Plugin: Unix

Control ID: 64ffd305a10ce99d067e46da6b9255d554778077d6427044807fc7f6a9788852