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Tutorial

This is the basic tutorial describing the basic flow you can follow to build your scheduler plugins made of wasm.

Build your wasm binary via SDK

Go SDK is the only language SDK that we support for now.

Like Scheduling Framework, the Go SDK provides the interfaces so that you can develop your own scheduling via a similar experience to Go scheduler plugin.

Some of them look different from the interfaces in Scheduling Framework though, it's the same how they're called by the scheduler.

You can learn how you can implement your wasm plugins by referring to ./examples.

Currently, Go SDK uses TinyGo for its compile, you can refer to Makefile to see how we build example implementations. Each example takes a different approach to build them, as README in them describes.

Integrate your wasm binary into your scheduler

We have a scheduler plugin which loads and runs wasm plugins. For now, you have to build the scheduler with the plugin by yourself though, we'll provide an official docker image after our first release.

You have to enable the scheduler plugin with your wasm binary in KubeSchedulerConfiguration, as following.

apiVersion: kubescheduler.config.k8s.io/v1
kind: KubeSchedulerConfiguration
profiles:
  - plugins:
      multiPoint:
        enabled:
           - name: wasmplugin1
           - name: wasmplugin2
      pluginConfig:
       - name: wasmplugin1
          args:
            guestURL: "file://path/to/wasm-plugin1.wasm"
       - name: wasmplugin2
          args:
            guestURL: "https://url/to/wasm-plugin2.wasm"
  • A wasm plugin must be enabled via multiPoint even if your wasm plugin only uses some of extension points.
  • All plugins with the plugin config matching the wasm config format are considered to be wasm plugins.