k8s-dummy-device-plugin

K8s Dummy Device Plugin (for testing purpose only)

This is a plugin that's used for testing and exploring Kubernetes Device Plugins.

In essence, it works as a kind of echo device. One specifies the (albeit pretend) devices in a JSON file, and the plugin operates on those, and allocates the devices to containers that request them -- it does this by setting those devices into environment variables in those containers.

Update 27 January 2021

creates nvidia.com/gpu device for testing. examples/daemonset.yml contains example deployment with config map Specify number of GPUs in config map Set label fake-device-plugin: 'true' on nodes to activate

Building

This plugin is built by simply building the dummy.go file. Make sure your $GOPATH is set correctly and build with:

go build dummy.go

Dependencies are managed and versioned internally with dep.

Example Usage (when deployed as DaemonSet)

In the ./examples/ directory there is an example DaemonSet that will deploy the device plugin on each node in your cluster.

kubectl create -f ./examples/daemonset.yml

Then create the sample pod, available as ./sample_pod.yaml in this repository.

$ kubectl create -f ./sample_pod.yaml

You may then see that the "devices" were created as environment variables.

$ kubectl exec -it dummy-pod -- /bin/sh -c "printenv" | grep DUMMY_DEVICES
DUMMY_DEVICES=dev_3,dev_4

Configuration

Configuration of the "pretend" devices are in the ./dummyResources.json file.

More configuration to come.