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Reusing types from the alpha in the beta made it possible to provide and use both versions without conversion. The downside was that removal of the alpha would have been harder, if not impossible. DRA drivers could continue to use the alpha types and provided the beta interface automatically. Now the two versions are completely separate gRPC APIs, although in practice there are no differences besides the name. Support for the alpha API in kubelet is provided via automatically generated conversion and manually written interface wrappers. Those are provided as part of the v1alpha4 package. The advantage of having all of that in a central place is that it'll be easier to remove when no longer needed.
Overview
The tests in this directory cover dynamic resource allocation support in Kubernetes. They do not test the correct behavior of arbitrary dynamic resource allocation drivers.
If such a driver is needed, then the in-tree test/e2e/dra/test-driver is used, with a slight twist: instead of deploying that driver directly in the cluster, the necessary sockets for interaction with kubelet (registration and dynamic resource allocation) get proxied into the e2e.test binary. This reuses the work done for CSI mock testing. The advantage is that no separate images are needed for the test driver and that the e2e test has full control over all gRPC calls, in case that it needs that for operations like error injection or checking calls.
Cluster setup preparation
The container runtime must support CDI. CRI-O supports CDI starting from release 1.23, Containerd supports CDI starting from release 1.7. To bring up a Kind cluster with Containerd, two things are needed:
NB: Kind switched to use worker-node base image with Containerd 1.7 by default starting from release 0.20, build kind from latest main branch sources or use Kind release binary 0.20 or later.
Build kind node image
After building Kubernetes, in Kubernetes source code tree build new node image:
$ kind build node-image --image dra/node:latest $(pwd)
Bring up a Kind cluster
$ kind create cluster --config test/e2e/dra/kind.yaml --image dra/node:latest
Run tests
- Build ginkgo
$ make ginkgo
- Run e2e tests for the
Dynamic Resource Allocationfeature:
$ KUBECONFIG=~/.kube/config _output/bin/ginkgo -p -v -focus=Feature:DynamicResourceAllocation ./test/e2e