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57 lines
2.8 KiB
Plaintext
57 lines
2.8 KiB
Plaintext
// This assembly covers how to configure cluster-wide PID limits by configuring
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// the kubeletconfig. Eventually, additional cluster-wide parameters should be
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// available for configuration. As additional parameters are added, it might be
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// better to change this assembly to be "Configuring cluster parameters" or
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// something similar.
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//
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// Also, this content theoretically applies to OSD as well, but the PID limits
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// can only be configured through the ROSA CLI. When other methods are added for
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// configuring PID limits, this assembly and its modules can be evaluated for
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// inclusion in the OSD docs.
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:_mod-docs-content-type: ASSEMBLY
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[id="rosa-configuring-pid-limits"]
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= Configuring PID limits
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include::_attributes/attributes-openshift-dedicated.adoc[]
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:context: rosa-configuring-pid-limits
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toc::[]
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A process identifier (PID) is a unique identifier assigned by the Linux kernel to each process or thread currently running on a system. The number of processes that can run simultaneously on a system is limited to 4,194,304 by the Linux kernel. This number might also be affected by limited access to other system resources such as memory, CPU, and disk space.
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In {product-title} 4.11 and later, by default, a pod can have a maximum of 4,096 PIDs. If your workload requires more than that, you can increase the allowed maximum number of PIDs by configuring a `KubeletConfig` object.
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{product-title} clusters running versions earlier than 4.11 use a default PID limit of `1024`.
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//Commenting out until this is confirmed a technology preview.
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//:FeatureName: Configuring the maximum number of PIDs
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// Understanding process ID limits
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include::modules/sd-understanding-process-id-limits.adoc[leveloffset=+1]
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// Risks of setting higher process ID limits
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include::modules/risks-setting-higher-process-id-limits.adoc[leveloffset=+1]
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//TODO Add these links when HCP docs are published separately.
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ifndef::openshift-rosa-hcp[]
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[role="_additional-resources"]
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.Additional resources
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* xref:../rosa_architecture/rosa_policy_service_definition/rosa-service-definition.adoc#rosa-sdpolicy-instance-types_rosa-service-definition[Instance types]
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* xref:../rosa_planning/rosa-planning-environment.adoc#rosa-planning-environment[Planning your environment]
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// Removed as part of OSDOCS-13310, until figures are verified.
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//* xref:../rosa_planning/rosa-limits-scalability.adoc#rosa-limits-scalability[Limits and scalability]
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endif::openshift-rosa-hcp[]
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ifdef::openshift-rosa[]
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include::modules/setting-higher-pid-limit-on-existing-cluster.adoc[leveloffset=+1]
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include::modules/removing-custom-config-from-cluster.adoc[leveloffset=+1]
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endif::openshift-rosa[]
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ifdef::openshift-rosa-hcp[]
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include::modules/setting-higher-pid-limit-on-machinepool.adoc[leveloffset=+1]
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include::modules/removing-custom-config-from-machinepool.adoc[leveloffset=+1]
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endif::openshift-rosa-hcp[]
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