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kubespray/docs/external_storage_provisioners/scheduler_plugins.md

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Scheduler plugins for Kubernetes

scheduler-plugins is out-of-tree scheduler plugins based on the scheduler framework.

The kube-scheduler binary includes a list of plugins:

Currently, we use helm chart to install the scheduler plugins, so that a second scheduler would be created and running. Note that running multi-scheduler will inevitably encounter resource conflicts when the cluster is short of resources.

Compatibility Matrix

There are requirements for the version of Kubernetes, please see Compatibility Matrix . It deserves our attention.

Scheduler Plugins Compiled With K8s Version
v0.28.9 v1.28.9
v0.27.8 v1.27.8

Turning it on

The scheduler_plugins_enabled option is used to enable the installation of scheduler plugins.

You can enable or disable some plugins by setting the scheduler_plugins_enabled_plugins or scheduler_plugins_disabled_plugins option. They must be in the list we mentioned above.

In addition, to use custom plugin configuration, set a value for scheduler_plugins_plugin_config option.

For example, for Coscheduling plugin, you want to customize the permit waiting timeout to 10 seconds:

scheduler_plugins_plugin_config:
  - name: Coscheduling
    args:
      permitWaitingTimeSeconds: 10 # default is 60

Leverage plugin

Once the plugin is installed, we can apply CRs into cluster. For example, if using CoScheduling, we can apply the CR and test the deployment in the example.