25f5d09ec0
Pods in Kubernetes endpoints are expected to shut-down 'gracefully' after receiving SIGTERM - we should keep accepting new connections for a while. This is because Kubernetes updates Service endpoints and sends SIGTERM to pods *in parallel*. See https://github.com/kubernetes/kubernetes/issues/106476 for more detail.
87 lines
2.8 KiB
Go
87 lines
2.8 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package gracefulshutdown
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import (
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"context"
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"fmt"
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"github.com/onsi/ginkgo/v2"
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"github.com/stretchr/testify/assert"
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appsv1 "k8s.io/api/apps/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/ingress-nginx/test/e2e/framework"
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"net/http"
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"strings"
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"time"
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)
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var _ = framework.IngressNginxDescribe("[Shutdown] Asynchronous shutdown", func() {
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f := framework.NewDefaultFramework("k8s-async-shutdown", func(f *framework.Framework) {
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f.Namespace = "k8s-async-shutdown"
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})
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host := "async-shutdown"
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ginkgo.BeforeEach(func() {
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f.NewSlowEchoDeployment()
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})
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ginkgo.It("should not shut down while still receiving traffic", func() {
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defer ginkgo.GinkgoRecover()
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err := f.UpdateIngressControllerDeployment(func(deployment *appsv1.Deployment) error {
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// Note: e2e's default terminationGracePeriodSeconds is 1 for some reason, so extend it
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grace := int64(300)
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deployment.Spec.Template.Spec.TerminationGracePeriodSeconds = &grace
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_, err := f.KubeClientSet.AppsV1().Deployments(f.Namespace).Update(context.TODO(), deployment, metav1.UpdateOptions{})
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return err
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})
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assert.Nil(ginkgo.GinkgoT(), err, "updating ingress controller deployment")
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f.EnsureIngress(framework.NewSingleIngress(host, "/", host, f.Namespace, framework.SlowEchoService, 80, nil))
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f.WaitForNginxServer(host,
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func(server string) bool {
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return strings.Contains(server, "server_name "+host)
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})
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// We need to get pod IP first because after the pod becomes terminating,
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// it is removed from Service endpoints, and becomes unable to be discovered by "f.HTTPTestClient()".
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ip := f.GetNginxPodIP()
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// Assume that the upstream takes 30 seconds to update its endpoints,
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// therefore we are still receiving traffic while shutting down
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go func() {
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defer ginkgo.GinkgoRecover()
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for i := 0; i < 120; i++ {
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f.HTTPDumbTestClient().
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GET("/").
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WithURL(fmt.Sprintf("http://%s/", ip)).
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WithHeader("Host", host).
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Expect().
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Status(http.StatusOK)
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framework.Sleep(250 * time.Millisecond)
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}
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}()
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start := time.Now()
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f.ScaleDeploymentToZero("nginx-ingress-controller")
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assert.GreaterOrEqualf(ginkgo.GinkgoT(), int(time.Since(start).Seconds()), 35,
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"should take more than 30 + 5 seconds for graceful shutdown")
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})
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})
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