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All code must use the context from Ginkgo when doing API calls or polling for a change, otherwise the code would not return immediately when the test gets aborted.
214 lines
8.2 KiB
Go
214 lines
8.2 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 node
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import (
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"context"
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"fmt"
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"strings"
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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/sets"
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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/storage/utils"
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imageutils "k8s.io/kubernetes/test/utils/image"
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admissionapi "k8s.io/pod-security-admission/api"
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"github.com/onsi/ginkgo/v2"
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)
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func preparePod(name string, node *v1.Node, propagation *v1.MountPropagationMode, hostDir string) *v1.Pod {
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const containerName = "cntr"
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bTrue := true
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var oneSecond int64 = 1
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// The pod prepares /mnt/test/<podname> and sleeps.
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cmd := fmt.Sprintf("mkdir /mnt/test/%[1]s; sleep 3600", name)
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pod := &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: name,
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},
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Spec: v1.PodSpec{
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NodeName: node.Name,
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Containers: []v1.Container{
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{
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Name: containerName,
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Image: imageutils.GetE2EImage(imageutils.BusyBox),
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Command: []string{"sh", "-c", cmd},
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VolumeMounts: []v1.VolumeMount{
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{
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Name: "host",
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MountPath: "/mnt/test",
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MountPropagation: propagation,
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},
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},
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SecurityContext: &v1.SecurityContext{
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Privileged: &bTrue,
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},
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},
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},
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Volumes: []v1.Volume{
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{
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Name: "host",
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VolumeSource: v1.VolumeSource{
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HostPath: &v1.HostPathVolumeSource{
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Path: hostDir,
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},
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},
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},
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},
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// speed up termination of the pod
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TerminationGracePeriodSeconds: &oneSecond,
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},
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}
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return pod
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}
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var _ = SIGDescribe("Mount propagation", func() {
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f := framework.NewDefaultFramework("mount-propagation")
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f.NamespacePodSecurityEnforceLevel = admissionapi.LevelPrivileged
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ginkgo.It("should propagate mounts within defined scopes", func(ctx context.Context) {
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// This test runs two pods: master and slave with respective mount
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// propagation on common /var/lib/kubelet/XXXX directory. Both mount a
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// tmpfs to a subdirectory there. We check that these mounts are
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// propagated to the right places.
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hostExec := utils.NewHostExec(f)
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ginkgo.DeferCleanup(hostExec.Cleanup)
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// Pick a node where all pods will run.
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node, err := e2enode.GetRandomReadySchedulableNode(ctx, f.ClientSet)
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framework.ExpectNoError(err)
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// Fail the test if the namespace is not set. We expect that the
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// namespace is unique and we might delete user data if it's not.
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if len(f.Namespace.Name) == 0 {
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framework.ExpectNotEqual(f.Namespace.Name, "")
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return
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}
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// hostDir is the directory that's shared via HostPath among all pods.
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// Make sure it's random enough so we don't clash with another test
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// running in parallel.
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hostDir := "/var/lib/kubelet/" + f.Namespace.Name
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ginkgo.DeferCleanup(func(ctx context.Context) error {
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cleanCmd := fmt.Sprintf("rm -rf %q", hostDir)
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return hostExec.IssueCommand(ctx, cleanCmd, node)
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})
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podClient := e2epod.NewPodClient(f)
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bidirectional := v1.MountPropagationBidirectional
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master := podClient.CreateSync(ctx, preparePod("master", node, &bidirectional, hostDir))
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hostToContainer := v1.MountPropagationHostToContainer
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slave := podClient.CreateSync(ctx, preparePod("slave", node, &hostToContainer, hostDir))
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none := v1.MountPropagationNone
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private := podClient.CreateSync(ctx, preparePod("private", node, &none, hostDir))
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defaultPropagation := podClient.CreateSync(ctx, preparePod("default", node, nil, hostDir))
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// Check that the pods sees directories of each other. This just checks
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// that they have the same HostPath, not the mount propagation.
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podNames := []string{master.Name, slave.Name, private.Name, defaultPropagation.Name}
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for _, podName := range podNames {
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for _, dirName := range podNames {
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cmd := fmt.Sprintf("test -d /mnt/test/%s", dirName)
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e2epod.ExecShellInPod(ctx, f, podName, cmd)
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}
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}
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// Each pod mounts one tmpfs to /mnt/test/<podname> and puts a file there.
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for _, podName := range podNames {
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cmd := fmt.Sprintf("mount -t tmpfs e2e-mount-propagation-%[1]s /mnt/test/%[1]s; echo %[1]s > /mnt/test/%[1]s/file", podName)
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e2epod.ExecShellInPod(ctx, f, podName, cmd)
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// unmount tmpfs when the test finishes
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cmd = fmt.Sprintf("umount /mnt/test/%s", podName)
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ginkgo.DeferCleanup(e2epod.ExecShellInPod, f, podName, cmd)
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}
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// The host mounts one tmpfs to testdir/host and puts a file there so we
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// can check mount propagation from the host to pods.
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cmd := fmt.Sprintf("mkdir %[1]q/host; mount -t tmpfs e2e-mount-propagation-host %[1]q/host; echo host > %[1]q/host/file", hostDir)
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err = hostExec.IssueCommand(ctx, cmd, node)
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framework.ExpectNoError(err)
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ginkgo.DeferCleanup(func(ctx context.Context) error {
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cmd := fmt.Sprintf("umount %q/host", hostDir)
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return hostExec.IssueCommand(ctx, cmd, node)
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})
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// Now check that mounts are propagated to the right containers.
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// expectedMounts is map of pod name -> expected mounts visible in the
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// pod.
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expectedMounts := map[string]sets.String{
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// Master sees only its own mount and not the slave's one.
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"master": sets.NewString("master", "host"),
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// Slave sees master's mount + itself.
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"slave": sets.NewString("master", "slave", "host"),
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// Private sees only its own mount
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"private": sets.NewString("private"),
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// Default (=private) sees only its own mount
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"default": sets.NewString("default"),
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}
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dirNames := append(podNames, "host")
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for podName, mounts := range expectedMounts {
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for _, mountName := range dirNames {
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cmd := fmt.Sprintf("cat /mnt/test/%s/file", mountName)
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stdout, stderr, err := e2epod.ExecShellInPodWithFullOutput(ctx, f, podName, cmd)
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framework.Logf("pod %s mount %s: stdout: %q, stderr: %q error: %v", podName, mountName, stdout, stderr, err)
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msg := fmt.Sprintf("When checking pod %s and directory %s", podName, mountName)
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shouldBeVisible := mounts.Has(mountName)
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if shouldBeVisible {
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framework.ExpectNoError(err, "%s: failed to run %q", msg, cmd)
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framework.ExpectEqual(stdout, mountName, msg)
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} else {
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// We *expect* cat to return error here
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framework.ExpectError(err, msg)
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}
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}
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}
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// Find the kubelet PID to ensure we're working with the kubelet's mount namespace
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cmd = "pidof kubelet"
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kubeletPid, err := hostExec.IssueCommandWithResult(ctx, cmd, node)
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framework.ExpectNoError(err, "Checking kubelet pid")
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kubeletPid = strings.TrimSuffix(kubeletPid, "\n")
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framework.ExpectEqual(strings.Count(kubeletPid, " "), 0, "kubelet should only have a single PID in the system (pidof returned %q)", kubeletPid)
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enterKubeletMountNS := fmt.Sprintf("nsenter -t %s -m", kubeletPid)
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// Check that the master and host mounts are propagated to the container runtime's mount namespace
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for _, mountName := range []string{"host", master.Name} {
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cmd := fmt.Sprintf("%s cat \"%s/%s/file\"", enterKubeletMountNS, hostDir, mountName)
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output, err := hostExec.IssueCommandWithResult(ctx, cmd, node)
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framework.ExpectNoError(err, "host container namespace should see mount from %s: %s", mountName, output)
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output = strings.TrimSuffix(output, "\n")
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framework.ExpectEqual(output, mountName, "host container namespace should see mount contents from %s", mountName)
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}
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// Check that the slave, private, and default mounts are not propagated to the container runtime's mount namespace
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for _, podName := range []string{slave.Name, private.Name, defaultPropagation.Name} {
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cmd := fmt.Sprintf("%s test ! -e \"%s/%s/file\"", enterKubeletMountNS, hostDir, podName)
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output, err := hostExec.IssueCommandWithResult(ctx, cmd, node)
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framework.ExpectNoError(err, "host container namespace shouldn't see mount from %s: %s", podName, output)
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}
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})
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})
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