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Since a few releases, Go supports `go build -race` and then produces
binaries which do data race detection when invoked. Some changes are needed to
enable using this in a kind cluster:
- `-race` must be passed when building dynamically linked binaries.
Only those support -race because CGO is required.
To avoid adding yet another env variables, the existing KUBE_RACE
gets used to convey the intent.
- KUBE_RACE must be passed into the dockerized build.
- Logging the base image of a release image makes it easier
to figure out whether the binary has a chance to run.
The base image is important because dynamically linked binaries need a base
image with libc. By default, control plane components are linked statically,
so users need to explicitly override the defaults:
KUBE_RACE=-race KUBE_CGO_OVERRIDES="kube-apiserver kube-controller-manager kube-scheduler" KUBE_GORUNNER_IMAGE=gcr.io/k8s-staging-test-infra/kubekins-e2e:v20250815-171060767f-master kind build node-image ...
KUBE_GORUNNER_IMAGE changes the base image for kube-apiserver,
kube-controller-manager and kube-scheduler. The kubekins image was picked for
this example because a Prow job definition already uses it. Reusing
it in a job avoids the need to maintain another image definition.
Running conformance tests against such a cluster with alpha+beta features
enabled revealed one new data race:
$ kubectl logs -n kube-system kube-controller-manager-kind-control-plane
...
WARNING: DATA RACE
Write at 0x00c00019a730 by goroutine 216:
k8s.io/client-go/tools/leaderelection.(*LeaderElector).setObservedRecord()
k8s.io/client-go/tools/leaderelection/leaderelection.go:529 +0x179
k8s.io/client-go/tools/leaderelection.(*LeaderElector).tryCoordinatedRenew()
k8s.io/client-go/tools/leaderelection/leaderelection.go:367 +0x5ca
...
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| .. | ||
| .gitattributes | ||
| etcd.sh | ||
| golang.sh | ||
| init.sh | ||
| logging.sh | ||
| protoc.sh | ||
| test.sh | ||
| util.sh | ||
| verify-generated.sh | ||
| version.sh | ||