was-cluster

DevOps & Security

Build and manage a kind cluster for Workload-Aware Scheduling (WAS) e2e tests. Use when the user wants to set up, run tests against, or tear down a WAS test cluster built from Kubernetes main.

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Source SKILL.md: https://github.com/kubernetes-sigs/kueue/blob/HEAD/cmd/experimental/skills/was-cluster/SKILL.md

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WAS Cluster

Sets up a kind cluster from Kubernetes main with GenericWorkload and WorkloadWithJob feature gates enabled, deploys Kueue, and runs WAS e2e tests.

Prerequisites

kind >= v0.32.0 (required for k8s main which dropped kubeadm v1beta3)
A local Kubernetes checkout at main (the user should tell you where it is, or check ~/Work/kubernetes)
Docker running

Setup: Build the cluster and leave it running

Step 1: Build the kind node image from k8s main

kind build node-image /path/to/kubernetes --image kindest/node:was-main

This only needs to be done once (or when the k8s checkout is updated). In dev mode, if the image already exists it will be reused.

Step 2: Stand up the cluster with Kueue deployed, no tests

See Invoking e2e-test.sh directly (without make) for background on the general-purpose env vars (ARTIFACTS, IMAGE_TAG, E2E_USE_HELM, GINKGO_ARGS, E2E_MODE, tty-less cleanup prompt behavior). The WAS-specific invocation is:

E2E_KIND_VERSION=kindest/node:was-main \
E2E_MODE=dev \
E2E_RUN_ONLY_ENV=true \
WAS_ENABLED=1 \
KIND_CLUSTER_NAME=was-test \
KIND_CLUSTER_FILE=kind-cluster.yaml \
E2E_TARGET_FOLDER=singlecluster/was \
ARTIFACTS="$(pwd)/artifacts/was-test" \
IMAGE_TAG=local/kueue:was-test \
E2E_USE_HELM=false \
GINKGO_ARGS="" \
  ./hack/testing/e2e-test.sh

Note: only singlecluster/was (Job integration) exists today. The former was/extended (JobSet) suite asserted against the upstream scheduling.k8s.io/v1alpha3 Go types directly, which would have required vendoring that alpha API into Kueue, so it was removed. Re-add JobSet coverage once there's a way to verify it without vendoring v1alpha3.

The singlecluster/was package lives under test/e2e/singlecluster/ (rather than a top-level test/e2e/was/) so that make test-e2e-k8s-main-was — which targets the whole singlecluster tree with WAS_ENABLED=true — actually runs it. Regular, non-WAS runs (make test-e2e-baseline, make test-e2e-extended) target only the singlecluster/baseline and singlecluster/extended subfolders respectively, so they never pick up singlecluster/was, which requires feature gates (GenericWorkload, WorkloadWithJob) and the scheduling.k8s.io/v1alpha3 API that only a WAS-patched cluster provides.

WAS-specific environment variables

These are specific to WAS; see the guideline link above for the rest.

Variable	Value	Why
`E2E_KIND_VERSION`	`kindest/node:was-main`	Uses pre-built node image; skips `build_kind_node_image` (non-standard name)
`WAS_ENABLED`	`1`	Triggers `patch_kind_config_for_was` adding the `GenericWorkload`/`WorkloadWithJob` feature gates and `scheduling.k8s.io/v1alpha3` runtime-config
`KIND_CLUSTER_NAME`	`was-test`	Cluster name
`KIND_CLUSTER_FILE`	`kind-cluster.yaml`	Base kind config that gets patched by `patch_kind_config_for_was`
`E2E_TARGET_FOLDER`	`singlecluster/was`	Points at the WAS test folder

Run tests

Once the cluster is up, run tests repeatedly without rebuilding:

KIND_CLUSTER_NAME=was-test go test ./test/e2e/singlecluster/was/... -v -count=1

Filter by label:

# Job integration tests only
KIND_CLUSTER_NAME=was-test go test ./test/e2e/singlecluster/was/... -v -count=1 --ginkgo.label-filter="feature:was-job"

Re-deploy Kueue after code changes

See Re-deploy Kueue after code changes (dev mode) in the contributor guideline; substitute was-test for <cluster-name> and the image tag used above.

Tear down

kind delete cluster --name was-test

Troubleshooting

kind create fails with kubeadm v1beta3 error: You need kind >= v0.32.0. Check with kind version.
scheduling.k8s.io/v1alpha3 not in kubectl api-resources: The k8s checkout must be at main (post v1alpha2→v1alpha3 rename). Rebuild the node image.
No PodGroups created for Jobs: Jobs must qualify for gang scheduling: parallelism > 1, completionMode: Indexed, completions == parallelism. This is the WorkloadWithJob feature gate behavior (KEP-5547). Verify both gates landed on the controller-manager: kubectl -n kube-system get pod -l component=kube-controller-manager -o jsonpath='{.items[0].spec.containers[0].command}' | tr ' ' '\n' | grep feature-gates should show GenericWorkload=true,WorkloadWithJob=true.
ARTIFACTS: unbound variable / IMAGE_TAG: unbound variable / E2E_USE_HELM: unbound variable / GINKGO_ARGS: unbound variable: e2e-test.sh has set -o nounset and relies on make to default these. Set them explicitly when invoking the script directly (see Step 2 above).