kubernetes/test/e2e_node/log_path_test.go

/*
Copyright 2016 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.
*/

package e2e_node

import (
	"github.com/onsi/ginkgo"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/uuid"
	"k8s.io/kubernetes/pkg/kubelet"
	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
	"k8s.io/kubernetes/test/e2e/framework"
	e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
)

const (
	logString        = "This is the expected log content of this node e2e test"
	logContainerName = "logger"
)

var _ = framework.KubeDescribe("ContainerLogPath [NodeConformance]", func() {
	f := framework.NewDefaultFramework("kubelet-container-log-path")
	var podClient *framework.PodClient

	ginkgo.Describe("Pod with a container", func() {
		ginkgo.Context("printed log to stdout", func() {
			makeLogPod := func(podName, log string) *v1.Pod {
				return &v1.Pod{
					ObjectMeta: metav1.ObjectMeta{
						Name: podName,
					},
					Spec: v1.PodSpec{
						// this pod is expected to exit successfully
						RestartPolicy: v1.RestartPolicyNever,
						Containers: []v1.Container{
							{
								Image:   busyboxImage,
								Name:    logContainerName,
								Command: []string{"sh", "-c", "echo " + log},
							},
						},
					},
				}
			}

			makeLogCheckPod := func(podName, log, expectedLogPath string) *v1.Pod {
				hostPathType := new(v1.HostPathType)
				*hostPathType = v1.HostPathType(string(v1.HostPathFileOrCreate))

				return &v1.Pod{
					ObjectMeta: metav1.ObjectMeta{
						Name: podName,
					},
					Spec: v1.PodSpec{
						// this pod is expected to exit successfully
						RestartPolicy: v1.RestartPolicyNever,
						Containers: []v1.Container{
							{
								Image: busyboxImage,
								Name:  podName,
								// If we find expected log file and contains right content, exit 0
								// else, keep checking until test timeout
								Command: []string{"sh", "-c", "while true; do if [ -e " + expectedLogPath + " ] && grep -q " + log + " " + expectedLogPath + "; then exit 0; fi; sleep 1; done"},
								VolumeMounts: []v1.VolumeMount{
									{
										Name: "logdir",
										// mount ContainerLogsDir to the same path in container
										MountPath: expectedLogPath,
										ReadOnly:  true,
									},
								},
							},
						},
						Volumes: []v1.Volume{
							{
								Name: "logdir",
								VolumeSource: v1.VolumeSource{
									HostPath: &v1.HostPathVolumeSource{
										Path: expectedLogPath,
										Type: hostPathType,
									},
								},
							},
						},
					},
				}
			}

			createAndWaitPod := func(pod *v1.Pod) error {
				podClient.Create(pod)
				return e2epod.WaitForPodSuccessInNamespace(f.ClientSet, pod.Name, f.Namespace.Name)
			}

			var logPodName string
			ginkgo.BeforeEach(func() {
				if framework.TestContext.ContainerRuntime == "docker" {
					// Container Log Path support requires JSON logging driver.
					// It does not work when Docker daemon is logging to journald.
					d, err := getDockerLoggingDriver()
					framework.ExpectNoError(err)
					if d != "json-file" {
						framework.Skipf("Skipping because Docker daemon is using a logging driver other than \"json-file\": %s", d)
					}
					// Even if JSON logging is in use, this test fails if SELinux support
					// is enabled, since the isolation provided by the SELinux policy
					// prevents processes running inside Docker containers (under SELinux
					// type svirt_lxc_net_t) from accessing the log files which are owned
					// by Docker (and labeled with the container_var_lib_t type.)
					//
					// Therefore, let's also skip this test when running with SELinux
					// support enabled.
					e, err := isDockerSELinuxSupportEnabled()
					framework.ExpectNoError(err)
					if e {
						framework.Skipf("Skipping because Docker daemon is running with SELinux support enabled")
					}
				}

				podClient = f.PodClient()
				logPodName = "log-pod-" + string(uuid.NewUUID())
				err := createAndWaitPod(makeLogPod(logPodName, logString))
				framework.ExpectNoError(err, "Failed waiting for pod: %s to enter success state", logPodName)
			})
			ginkgo.It("should print log to correct log path", func() {

				logDir := kubelet.ContainerLogsDir

				// get containerID from created Pod
				createdLogPod, err := podClient.Get(logPodName, metav1.GetOptions{})
				logContainerID := kubecontainer.ParseContainerID(createdLogPod.Status.ContainerStatuses[0].ContainerID)
				framework.ExpectNoError(err, "Failed to get pod: %s", logPodName)

				// build log file path
				expectedlogFile := logDir + "/" + logPodName + "_" + f.Namespace.Name + "_" + logContainerName + "-" + logContainerID.ID + ".log"

				logCheckPodName := "log-check-" + string(uuid.NewUUID())
				err = createAndWaitPod(makeLogCheckPod(logCheckPodName, logString, expectedlogFile))
				framework.ExpectNoError(err, "Failed waiting for pod: %s to enter success state", logCheckPodName)
			})

			ginkgo.It("should print log to correct cri log path", func() {

				logCRIDir := "/var/log/pods"

				// get podID from created Pod
				createdLogPod, err := podClient.Get(logPodName, metav1.GetOptions{})
				framework.ExpectNoError(err, "Failed to get pod: %s", logPodName)
				podNs := createdLogPod.Namespace
				podName := createdLogPod.Name
				podID := string(createdLogPod.UID)

				// build log cri file path
				expectedCRILogFile := logCRIDir + "/" + podNs + "_" + podName + "_" + podID + "/" + logContainerName + "/0.log"

				logCRICheckPodName := "log-cri-check-" + string(uuid.NewUUID())
				err = createAndWaitPod(makeLogCheckPod(logCRICheckPodName, logString, expectedCRILogFile))
				framework.ExpectNoError(err, "Failed waiting for pod: %s to enter success state", logCRICheckPodName)
			})
		})
	})
})