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runtimeclass.md

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RuntimeClass

Runtime Class Manager is in charge of creating a RuntimeClass for each Shim resource created on the cluster.

The spec.runtimeClass section of the Shim resource configures the RuntimeClass that will be created.

  • spec.runtimeClass.name: Name of the Kubernetes RuntimeClass
    • This name should match what is expected by shim-specific operator(s) on the cluster
    • For example, the Spin Operator utilizes a SpinAppExecutor resource to run Spin Apps; the default RuntimeClass name it expects can be seen here
  • spec.runtimeClass.handler: Name of the shim as it is referenced in the containerd config

Note: The RuntimeClass's scheduling.nodeSelector will be set to the same key/value pair as configured in the Shim resource. This ensures that applications targeting the RuntimeClass are only scheduled on nodes where the corresponding runtime shim has been installed.