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Merge pull request #104334 from ipochi/imran/re-revert-lock-contentio…
…n-tests Revert #104308 to bring back LockContention tests
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//go:build linux | ||
// +build linux | ||
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/* | ||
Copyright 2021 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package e2enode | ||
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import ( | ||
"time" | ||
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"golang.org/x/sys/unix" | ||
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"github.com/onsi/ginkgo" | ||
"github.com/onsi/gomega" | ||
"k8s.io/kubernetes/test/e2e/framework" | ||
) | ||
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const contentionLockFile = "/var/run/kubelet.lock" | ||
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// Kubelet Lock contention tests the lock contention feature. | ||
// Disruptive because the kubelet is restarted in the test. | ||
// NodeSpecialFeature:LockContention because we don't want the test to be picked up by any other | ||
// test suite, hence the unique name "LockContention". | ||
var _ = SIGDescribe("Lock contention [Slow] [Disruptive] [NodeSpecialFeature:LockContention]", func() { | ||
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// Requires `--lock-file` & `--exit-on-lock-contention` flags to be set on the Kubelet. | ||
ginkgo.It("Kubelet should stop when the test acquires the lock on lock file and restart once the lock is released", func() { | ||
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ginkgo.By("perform kubelet health check to check if kubelet is healthy and running.") | ||
// Precautionary check that kubelet is healthy before running the test. | ||
gomega.Expect(kubeletHealthCheck(kubeletHealthCheckURL)).To(gomega.BeTrue()) | ||
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ginkgo.By("acquiring the lock on lock file i.e /var/run/kubelet.lock") | ||
// Open the file with the intention to acquire the lock, this would imitate the behaviour | ||
// of the another kubelet(self-hosted) trying to start. When this lock contention happens | ||
// it is expected that the running kubelet must terminate and wait until the lock on the | ||
// lock file is released. | ||
// Kubelet uses the same approach to acquire the lock on lock file as shown here: | ||
// https://github.com/kubernetes/kubernetes/blob/9d2b361ebc7ef28f7cb75596ef40b7c239732d37/cmd/kubelet/app/server.go#L512-#L523 | ||
// and the function definition of Acquire is here: | ||
// https://github.com/kubernetes/kubernetes/blob/9d2b361ebc7ef28f7cb75596ef40b7c239732d37/pkg/util/flock/flock_unix.go#L26 | ||
fd, err := unix.Open(contentionLockFile, unix.O_CREAT|unix.O_RDWR|unix.O_CLOEXEC, 0600) | ||
framework.ExpectNoError(err) | ||
// Defer the lock release in case test fails and we don't reach the step of the release | ||
// lock. This ensures that we release the lock for sure. | ||
defer func() { | ||
err = unix.Flock(fd, unix.LOCK_UN) | ||
framework.ExpectNoError(err) | ||
}() | ||
// Acquire lock. | ||
err = unix.Flock(fd, unix.LOCK_EX) | ||
framework.ExpectNoError(err) | ||
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ginkgo.By("verifying the kubelet is not healthy as there was a lock contention.") | ||
// Once the lock is acquired, check if the kubelet is in healthy state or not. | ||
// It should not be. | ||
gomega.Eventually(func() bool { | ||
return kubeletHealthCheck(kubeletHealthCheckURL) | ||
}, 10*time.Second, time.Second).Should(gomega.BeFalse()) | ||
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ginkgo.By("releasing the lock on lock file i.e /var/run/kubelet.lock, triggering kubelet restart.") | ||
// Release the lock. | ||
err = unix.Flock(fd, unix.LOCK_UN) | ||
framework.ExpectNoError(err) | ||
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// Releasing the lock triggers kubelet to re-acquire the lock and restart. | ||
ginkgo.By("verifying the kubelet is healthy after restart.") | ||
// Kubelet should report healthy state. | ||
gomega.Eventually(func() bool { | ||
return kubeletHealthCheck(kubeletHealthCheckURL) | ||
}, 10*time.Second, time.Second).Should(gomega.BeTrue()) | ||
}) | ||
}) |