diff --git a/test/e2e/network/kube_proxy.go b/test/e2e/network/kube_proxy.go index 10d2cb86e69..8ad203fa2b6 100644 --- a/test/e2e/network/kube_proxy.go +++ b/test/e2e/network/kube_proxy.go @@ -17,20 +17,22 @@ limitations under the License. package network import ( + "encoding/hex" "encoding/json" "fmt" "math" + "net" "strconv" "strings" "time" v1 "k8s.io/api/core/v1" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" + "k8s.io/apimachinery/pkg/util/wait" "k8s.io/kubernetes/test/e2e/framework" e2enode "k8s.io/kubernetes/test/e2e/framework/node" e2epod "k8s.io/kubernetes/test/e2e/framework/pod" - e2essh "k8s.io/kubernetes/test/e2e/framework/ssh" "k8s.io/kubernetes/test/images/agnhost/net/nat" imageutils "k8s.io/kubernetes/test/utils/image" @@ -42,10 +44,10 @@ var kubeProxyE2eImage = imageutils.GetE2EImage(imageutils.Agnhost) var _ = SIGDescribe("Network", func() { const ( - testDaemonHTTPPort = 11301 - testDaemonTCPPort = 11302 - timeoutSeconds = 10 - postFinTimeoutSeconds = 5 + testDaemonHTTPPort = 11301 + testDaemonTCPPort = 11302 + deadlineTimeoutSeconds = 10 + postFinTimeoutSeconds = 30 ) fr := framework.NewDefaultFramework("network") @@ -81,16 +83,63 @@ var _ = SIGDescribe("Network", func() { zero := int64(0) + // Create a pod to check the conntrack entries on the host node + // It mounts the host /proc/net folder to be able to access + // the nf_conntrack file with the host conntrack entries + privileged := true + + hostExecPod := &v1.Pod{ + ObjectMeta: metav1.ObjectMeta{ + Name: "e2e-net-exec", + Namespace: fr.Namespace.Name, + Labels: map[string]string{"app": "e2e-net-exec"}, + }, + Spec: v1.PodSpec{ + HostNetwork: true, + NodeName: clientNodeInfo.name, + Containers: []v1.Container{ + { + Name: "e2e-net-exec", + Image: kubeProxyE2eImage, + ImagePullPolicy: "Always", + Args: []string{"pause"}, + VolumeMounts: []v1.VolumeMount{ + { + Name: "proc-net", + MountPath: "/rootfs/proc/net", + ReadOnly: true, + }, + }, + SecurityContext: &v1.SecurityContext{ + Privileged: &privileged, + }, + }, + }, + Volumes: []v1.Volume{ + { + Name: "proc-net", + VolumeSource: v1.VolumeSource{ + HostPath: &v1.HostPathVolumeSource{ + Path: "/proc/net", + }, + }, + }, + }, + TerminationGracePeriodSeconds: &zero, + }, + } + fr.PodClient().CreateSync(hostExecPod) + defer fr.PodClient().DeleteSync(hostExecPod.Name, &metav1.DeleteOptions{}, framework.DefaultPodDeletionTimeout) + // Some distributions (Ubuntu 16.04 etc.) don't support the proc file. - _, err = e2essh.IssueSSHCommandWithResult( - "ls /proc/net/nf_conntrack", - framework.TestContext.Provider, - clientNodeInfo.node) + _, err = framework.RunHostCmd(fr.Namespace.Name, "e2e-net-exec", + "ls /rootfs/proc/net/nf_conntrack") if err != nil && strings.Contains(err.Error(), "No such file or directory") { framework.Skipf("The node %s does not support /proc/net/nf_conntrack", clientNodeInfo.name) } framework.ExpectNoError(err) + // Create the client and server pods clientPodSpec := &v1.Pod{ ObjectMeta: metav1.ObjectMeta{ Name: "e2e-net-client", @@ -105,7 +154,7 @@ var _ = SIGDescribe("Network", func() { Image: kubeProxyE2eImage, ImagePullPolicy: "Always", Args: []string{ - "net", "--serve", fmt.Sprintf("0.0.0.0:%d", testDaemonHTTPPort), + "net", "--serve", fmt.Sprintf(":%d", testDaemonHTTPPort), }, }, }, @@ -130,7 +179,7 @@ var _ = SIGDescribe("Network", func() { "net", "--runner", "nat-closewait-server", "--options", - fmt.Sprintf(`{"LocalAddr":"0.0.0.0:%v", "PostFindTimeoutSeconds":%v}`, + fmt.Sprintf(`{"LocalAddr":":%v", "PostFinTimeoutSeconds":%v}`, testDaemonTCPPort, postFinTimeoutSeconds), }, @@ -164,10 +213,10 @@ var _ = SIGDescribe("Network", func() { ginkgo.By("Make client connect") options := nat.CloseWaitClientOptions{ - RemoteAddr: fmt.Sprintf("%v:%v", - serverNodeInfo.nodeIP, testDaemonTCPPort), - TimeoutSeconds: timeoutSeconds, - PostFinTimeoutSeconds: 0, + + RemoteAddr: net.JoinHostPort(serverNodeInfo.nodeIP, strconv.Itoa(testDaemonTCPPort)), + TimeoutSeconds: deadlineTimeoutSeconds, + PostFinTimeoutSeconds: postFinTimeoutSeconds, LeakConnection: true, } @@ -179,47 +228,55 @@ var _ = SIGDescribe("Network", func() { `'%v' 2>/dev/null`, testDaemonHTTPPort, string(jsonBytes)) - framework.RunHostCmdOrDie(fr.Namespace.Name, "e2e-net-client", cmd) + // Run the closewait command in a subroutine so it keeps waiting during postFinTimeoutSeconds + // otherwise the pod is deleted and the connection is closed loosing the conntrack entry + go func() { + defer ginkgo.GinkgoRecover() + _, err = framework.RunHostCmd(fr.Namespace.Name, "e2e-net-client", cmd) + framework.ExpectNoError(err) + }() <-time.After(time.Duration(1) * time.Second) ginkgo.By("Checking /proc/net/nf_conntrack for the timeout") - // If test flakes occur here, then this check should be performed - // in a loop as there may be a race with the client connecting. - e2essh.IssueSSHCommandWithResult( - fmt.Sprintf("sudo cat /proc/net/nf_conntrack | grep 'dport=%v'", - testDaemonTCPPort), - framework.TestContext.Provider, - clientNodeInfo.node) - - // Timeout in seconds is available as the fifth column from - // /proc/net/nf_conntrack. - result, err := e2essh.IssueSSHCommandWithResult( - fmt.Sprintf( - "sudo cat /proc/net/nf_conntrack "+ - "| grep 'CLOSE_WAIT.*dst=%v.*dport=%v' "+ - "| tail -n 1"+ - "| awk '{print $5}' ", - serverNodeInfo.nodeIP, - testDaemonTCPPort), - framework.TestContext.Provider, - clientNodeInfo.node) - framework.ExpectNoError(err) - - timeoutSeconds, err := strconv.Atoi(strings.TrimSpace(result.Stdout)) - framework.ExpectNoError(err) - // These must be synchronized from the default values set in // pkg/apis/../defaults.go ConntrackTCPCloseWaitTimeout. The // current defaults are hidden in the initialization code. const epsilonSeconds = 60 const expectedTimeoutSeconds = 60 * 60 - - framework.Logf("conntrack entry timeout was: %v, expected: %v", - timeoutSeconds, expectedTimeoutSeconds) - - gomega.Expect(math.Abs(float64(timeoutSeconds - expectedTimeoutSeconds))).Should( - gomega.BeNumerically("<", (epsilonSeconds))) + // the conntrack file uses the IPv6 expanded format + ip := fullIPv6(net.ParseIP(serverNodeInfo.nodeIP)) + // Obtain the corresponding conntrack entry on the host checking + // the nf_conntrack file from the pod e2e-net-exec. + // It retries in a loop if the entry is not found. + cmd = fmt.Sprintf("cat /rootfs/proc/net/nf_conntrack "+ + "| grep -m 1 'CLOSE_WAIT.*dst=%v.*dport=%v' ", + ip, testDaemonTCPPort) + if err := wait.PollImmediate(5*time.Second, 30*time.Second, func() (bool, error) { + result, err := framework.RunHostCmd(fr.Namespace.Name, "e2e-net-exec", cmd) + // retry if we can't obtain the conntrack entry + if err != nil { + framework.Logf("failed to obtain conntrack entry: %v %v", result, err) + return false, nil + } + framework.Logf("conntrack entry for node %v and port %v: %v", serverNodeInfo.nodeIP, testDaemonTCPPort, result) + // Timeout in seconds is available as the fifth column of + // the matched entry in /proc/net/nf_conntrack. + line := strings.Fields(result) + if len(line) < 5 { + return false, fmt.Errorf("conntrack entry does not have a timeout field: %v", line) + } + timeoutSeconds, err := strconv.Atoi(line[4]) + if err != nil { + return false, fmt.Errorf("failed to convert matched timeout %s to integer: %v", line[4], err) + } + if math.Abs(float64(timeoutSeconds-expectedTimeoutSeconds)) < epsilonSeconds { + return true, nil + } + return false, fmt.Errorf("wrong TCP CLOSE_WAIT timeout: %v expected: %v", timeoutSeconds, expectedTimeoutSeconds) + }); err != nil { + framework.Failf("no conntrack entry for port %d on node %s", testDaemonTCPPort, serverNodeInfo.nodeIP) + } }) // Regression test for #74839, where: @@ -336,3 +393,22 @@ var _ = SIGDescribe("Network", func() { } }) }) + +// fullIPv6 returns a string with the IP representation +// if IPv6 it returns the expanded address format +// credit https://stackoverflow.com/a/52003106/4532704 +func fullIPv6(ip net.IP) string { + if ip.To4() == nil { + dst := make([]byte, hex.EncodedLen(len(ip))) + _ = hex.Encode(dst, ip) + return string(dst[0:4]) + ":" + + string(dst[4:8]) + ":" + + string(dst[8:12]) + ":" + + string(dst[12:16]) + ":" + + string(dst[16:20]) + ":" + + string(dst[20:24]) + ":" + + string(dst[24:28]) + ":" + + string(dst[28:]) + } + return ip.String() +}