mirror of
https://github.com/openshift/openshift-docs.git
synced 2026-02-05 12:46:18 +01:00
58 lines
1.9 KiB
Plaintext
58 lines
1.9 KiB
Plaintext
// Module included in the following assemblies:
|
|
//
|
|
// * nodes/nodes-cluster-overcommit.adoc
|
|
// * post_installation_configuration/node-tasks.adoc
|
|
|
|
:_mod-docs-content-type: PROCEDURE
|
|
[id="nodes-cluster-overcommit-node-enforcing_{context}"]
|
|
|
|
= Disabling or enforcing CPU limits using CPU CFS quotas
|
|
|
|
[role="_abstract"]
|
|
You can disable the default enforcement of CPU limits for nodes in a machine config pool.
|
|
|
|
By default, nodes enforce specified CPU limits using the Completely Fair Scheduler (CFS) quota support in the Linux kernel.
|
|
|
|
If you disable CPU limit enforcement, it is important to understand the impact on your node:
|
|
|
|
* If a container has a CPU request, the request continues to be enforced by CFS shares in the Linux kernel.
|
|
* If a container does not have a CPU request, but does have a CPU limit, the CPU request defaults to the specified CPU limit, and is enforced by CFS shares in the Linux kernel.
|
|
* If a container has both a CPU request and limit, the CPU request is enforced by CFS shares in the Linux kernel, and the CPU limit has no impact on the node.
|
|
|
|
.Prerequisites
|
|
|
|
* You have the label associated with the static `MachineConfigPool` CRD for the type of node you want to configure.
|
|
|
|
.Procedure
|
|
|
|
. Create a custom resource (CR) for your configuration change.
|
|
+
|
|
.Sample configuration for a disabling CPU limits
|
|
[source,yaml]
|
|
----
|
|
apiVersion: machineconfiguration.openshift.io/v1
|
|
kind: KubeletConfig
|
|
metadata:
|
|
name: disable-cpu-units
|
|
spec:
|
|
machineConfigPoolSelector:
|
|
matchLabels:
|
|
pools.operator.machineconfiguration.openshift.io/worker: ""
|
|
kubeletConfig:
|
|
cpuCfsQuota: false
|
|
----
|
|
where:
|
|
+
|
|
--
|
|
`metadata.name`:: Specifies a name for the CR.
|
|
`spec.machineConfigPoolSelector.matchLabels`:: Specifies the label from the machine config pool.
|
|
`spec.kubeletConfig.cpuCfsQuota`:: Specifies the `cpuCfsQuota` parameter to `false`.
|
|
--
|
|
|
|
. Run the following command to create the CR:
|
|
+
|
|
[source,terminal]
|
|
----
|
|
$ oc create -f <file_name>.yaml
|
|
----
|