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0695bc45cf
We were avoiding the scheduled using the pod.Spec.NodeName directly, however, once we switched to using the node selector, the no_snat e2e test started to fail because was trying to schedule pods on nodes with taints, hence, failing the test.
122 lines
3.8 KiB
Go
122 lines
3.8 KiB
Go
/*
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Copyright 2017 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 network
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import (
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"context"
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"fmt"
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"net"
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"time"
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"github.com/onsi/ginkgo"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/test/e2e/framework"
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e2enode "k8s.io/kubernetes/test/e2e/framework/node"
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e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
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"k8s.io/kubernetes/test/e2e/network/common"
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imageutils "k8s.io/kubernetes/test/utils/image"
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)
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const (
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testPodPort = "8080"
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noSNATTestName = "no-snat-test"
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)
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var (
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testPod = v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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GenerateName: noSNATTestName,
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Labels: map[string]string{
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noSNATTestName: "",
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},
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: noSNATTestName,
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Image: imageutils.GetE2EImage(imageutils.Agnhost),
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Args: []string{"netexec", "--http-port", testPodPort},
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},
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},
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},
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}
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)
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// This test verifies that a Pod on each node in a cluster can talk to Pods on every other node without SNAT.
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// We use the [Feature:NoSNAT] tag so that most jobs will skip this test by default.
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var _ = common.SIGDescribe("NoSNAT [Feature:NoSNAT] [Slow]", func() {
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f := framework.NewDefaultFramework("no-snat-test")
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ginkgo.It("Should be able to send traffic between Pods without SNAT", func() {
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cs := f.ClientSet
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pc := cs.CoreV1().Pods(f.Namespace.Name)
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ginkgo.By("creating a test pod on each Node")
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nodes, err := e2enode.GetReadySchedulableNodes(cs)
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framework.ExpectNoError(err)
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framework.ExpectNotEqual(len(nodes.Items), 0, "no Nodes in the cluster")
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for _, node := range nodes.Items {
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// target Pod at Node
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nodeSelection := e2epod.NodeSelection{Name: node.Name}
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e2epod.SetNodeSelection(&testPod.Spec, nodeSelection)
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_, err = pc.Create(context.TODO(), &testPod, metav1.CreateOptions{})
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framework.ExpectNoError(err)
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}
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ginkgo.By("waiting for all of the no-snat-test pods to be scheduled and running")
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err = wait.PollImmediate(10*time.Second, 1*time.Minute, func() (bool, error) {
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pods, err := pc.List(context.TODO(), metav1.ListOptions{LabelSelector: noSNATTestName})
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if err != nil {
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return false, err
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}
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// check all pods are running
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for _, pod := range pods.Items {
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if pod.Status.Phase != v1.PodRunning {
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if pod.Status.Phase != v1.PodPending {
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return false, fmt.Errorf("expected pod to be in phase \"Pending\" or \"Running\"")
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}
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return false, nil // pod is still pending
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}
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}
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return true, nil // all pods are running
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})
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framework.ExpectNoError(err)
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ginkgo.By("sending traffic from each pod to the others and checking that SNAT does not occur")
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pods, err := pc.List(context.TODO(), metav1.ListOptions{LabelSelector: noSNATTestName})
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framework.ExpectNoError(err)
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// hit the /clientip endpoint on every other Pods to check if source ip is preserved
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// this test is O(n^2) but it doesn't matter because we only run this test on small clusters (~3 nodes)
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for _, sourcePod := range pods.Items {
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for _, targetPod := range pods.Items {
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if targetPod.Name == sourcePod.Name {
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continue
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}
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targetAddr := net.JoinHostPort(targetPod.Status.PodIP, testPodPort)
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sourceIP, execPodIP := execSourceIPTest(sourcePod, targetAddr)
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ginkgo.By("Verifying the preserved source ip")
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framework.ExpectEqual(sourceIP, execPodIP)
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}
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}
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})
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})
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