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TELCODOCS-2292 - RAN RDS - sysclts #100294

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Oct 16, 2025
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TELCODOCS-2292 - RAN RDS - sysclts #100294

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30 changes: 30 additions & 0 deletions modules/telco-ran-sysctls.adoc
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// Module included in the following assemblies:
//
// * scalability_and_performance/telco-ran-du-rds.adoc

:_mod-docs-content-type: REFERENCE
[id="telco-ran-sysctls_{context}"]
= Kubelet Settings

Some CNF workloads make use of sysctls which are not in the list of system-wide safe sysctls.
Generally, network sysctls are namespaced and you can enable them using the `kubeletconfig.experimental` annotation in the `PerformanceProfile` Custom Resource (CR) as a string of JSON in the following form:

.Example snippet showing allowedUnsafeSysctls
[source,yaml]
----
apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
name: {{ .metadata.name }}
annotations:kubeletconfig.experimental: |
{"allowedUnsafeSysctls":["net.ipv6.conf.all.accept_ra"]}
# ...
----

[NOTE]
====
Although these sysctls are namespaced, they may allow a pod to consume memory or other resources beyond any limits specified in the pod description.
You must ensure that these sysctls do not exhaust platform resources.
====

For more information, see "Using sysctls in containers".
7 changes: 7 additions & 0 deletions scalability_and_performance/telco-ran-du-rds.adoc
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Expand Up @@ -39,6 +39,13 @@ include::modules/telco-ran-bios-tuning.adoc[leveloffset=+2]

* xref:../scalability_and_performance/cnf-provisioning-low-latency-workloads.adoc#cnf-provisioning-low-latency-workloads[Provisioning real-time and low latency workloads]

include::modules/telco-ran-sysctls.adoc[leveloffset=+2]

[role="_additional-resources"]
.Additional resources

* xref:../nodes/containers/nodes-containers-sysctls.adoc#nodes-containers-sysctls-about[Using sysctls in containers]

include::modules/telco-ran-node-tuning-operator.adoc[leveloffset=+2]

[role="_additional-resources"]
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