Merge pull request #11056 from wojtek-t/rewrite_services_in_go

Rewrite services shell test in Go.

hack/e2e-suite/services.sh

@@ -16,6 +16,11 @@
 
 # Verifies that services and virtual IPs work.
 
+
+# TODO(wojtek-t): Remove this test once the following go tests are stable:
+# - "should work after restarting kube-proxy"
+# - "should work after restarting apiserver"
+
 set -o errexit
 set -o nounset
 set -o pipefail

hack/jenkins/e2e.sh

@@ -107,6 +107,7 @@ GCE_PARALLEL_SKIP_TESTS=(
     "Nodes\sNetwork"
     "Nodes\sResize"
     "MaxPods"
+    "Services.*restarting"
     "Shell.*services"
     )
 

test/e2e/service.go

@@ -230,6 +230,131 @@ var _ = Describe("Services", func() {
 		validateEndpointsOrFail(c, ns, serviceName, map[string][]int{})
 	})
 
+	It("should be able to up and down services", func() {
+		ns := namespaces[0]
+		numPods, servicePort := 3, 80
+
+		podNames1, svc1IP, err := startServeHostnameService(c, ns, "service1", servicePort, numPods)
+		Expect(err).NotTo(HaveOccurred())
+		podNames2, svc2IP, err := startServeHostnameService(c, ns, "service2", servicePort, numPods)
+		Expect(err).NotTo(HaveOccurred())
+
+		hosts, err := NodeSSHHosts(c)
+		Expect(err).NotTo(HaveOccurred())
+		if len(hosts) == 0 {
+			Failf("No ssh-able nodes")
+		}
+		host := hosts[0]
+
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+
+		// Stop service 1 and make sure it is gone.
+		expectNoError(stopServeHostnameService(c, ns, "service1"))
+
+		expectNoError(verifyServeHostnameServiceDown(c, host, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+
+		// Start another service and verify both are up.
+		podNames3, svc3IP, err := startServeHostnameService(c, ns, "service3", servicePort, numPods)
+		Expect(err).NotTo(HaveOccurred())
+
+		if svc2IP == svc3IP {
+			Failf("VIPs conflict: %v", svc2IP)
+		}
+
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames3, svc3IP, servicePort))
+
+		expectNoError(stopServeHostnameService(c, ns, "service2"))
+		expectNoError(stopServeHostnameService(c, ns, "service3"))
+	})
+
+	It("should work after restarting kube-proxy", func() {
+		SkipUnlessProviderIs("gce", "gke")
+
+		ns := namespaces[0]
+		numPods, servicePort := 3, 80
+
+		defer func() { expectNoError(stopServeHostnameService(c, ns, "service1")) }()
+		podNames1, svc1IP, err := startServeHostnameService(c, ns, "service1", servicePort, numPods)
+		Expect(err).NotTo(HaveOccurred())
+		defer func() { expectNoError(stopServeHostnameService(c, ns, "service2")) }()
+		podNames2, svc2IP, err := startServeHostnameService(c, ns, "service2", servicePort, numPods)
+		Expect(err).NotTo(HaveOccurred())
+
+		if svc1IP == svc2IP {
+			Failf("VIPs conflict: %v", svc1IP)
+		}
+
+		hosts, err := NodeSSHHosts(c)
+		Expect(err).NotTo(HaveOccurred())
+		if len(hosts) == 0 {
+			Failf("No ssh-able nodes")
+		}
+		host := hosts[0]
+
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+
+		// Restart kube-proxy and verify that services are still reachable (after some time).
+		if err := restartKubeProxy(host); err != nil {
+			Failf("error restarting kube-proxy: %v", err)
+		}
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+
+		// Remove iptable rules and make sure they come back.
+		By("Remove iptable rules and make sure they come back")
+		_, _, code, err := SSH(`
+			sudo iptables -t nat -F KUBE-PORTALS-HOST || true;
+			sudo iptables -t nat -F KUBE-PORTALS-CONTAINER || true`, host, testContext.Provider)
+		if err != nil || code != 0 {
+			Failf("couldn't remove iptable rules: %v (code %v)", err, code)
+		}
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+	})
+
+	It("should work after restarting apiserver", func() {
+		// TODO: restartApiserver doesn't work in GKE - fix it and reenable this test.
+		SkipUnlessProviderIs("gce")
+
+		ns := namespaces[0]
+		numPods, servicePort := 3, 80
+
+		defer func() { expectNoError(stopServeHostnameService(c, ns, "service1")) }()
+		podNames1, svc1IP, err := startServeHostnameService(c, ns, "service1", servicePort, numPods)
+
+		hosts, err := NodeSSHHosts(c)
+		Expect(err).NotTo(HaveOccurred())
+		if len(hosts) == 0 {
+			Failf("No ssh-able nodes")
+		}
+		host := hosts[0]
+
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+
+		// Restart apiserver
+		if err := restartApiserver(); err != nil {
+			Failf("error restarting apiserver: %v", err)
+		}
+		if err := waitForApiserverUp(c); err != nil {
+			Failf("error while waiting for apiserver up: %v", err)
+		}
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+
+		// Create a new service and check if it's not reusing IP.
+		defer func() { expectNoError(stopServeHostnameService(c, ns, "service2")) }()
+		podNames2, svc2IP, err := startServeHostnameService(c, ns, "service2", servicePort, numPods)
+
+		if svc1IP == svc2IP {
+			Failf("VIPs conflict: %v", svc1IP)
+		}
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames1, svc1IP, servicePort))
+		expectNoError(verifyServeHostnameServiceUp(c, host, podNames2, svc2IP, servicePort))
+	})
+
 	It("should be able to create a functioning external load balancer", func() {
 		// requires ExternalLoadBalancer
 		SkipUnlessProviderIs("gce", "gke", "aws")
@@ -1112,6 +1237,131 @@ func testNotReachable(ip string, port int) {
 	Expect(err).NotTo(HaveOccurred(), "Error waiting for %s", desc)
 }
 
+// Creates a replication controller that serves its hostname and a service on top of it.
+func startServeHostnameService(c *client.Client, ns, name string, port, replicas int) ([]string, string, error) {
+	podNames := make([]string, replicas)
+
+	_, err := c.Services(ns).Create(&api.Service{
+		ObjectMeta: api.ObjectMeta{
+			Name: name,
+		},
+		Spec: api.ServiceSpec{
+			Ports: []api.ServicePort{{
+				Port:       port,
+				TargetPort: util.NewIntOrStringFromInt(9376),
+				Protocol:   "TCP",
+			}},
+			Selector: map[string]string{
+				"name": name,
+			},
+		},
+	})
+	if err != nil {
+		return podNames, "", err
+	}
+
+	var createdPods []*api.Pod
+	maxContainerFailures := 0
+	config := RCConfig{
+		Client:               c,
+		Image:                "gcr.io/google_containers/serve_hostname:1.1",
+		Name:                 name,
+		Namespace:            ns,
+		PollInterval:         3 * time.Second,
+		Timeout:              30 * time.Second,
+		Replicas:             replicas,
+		CreatedPods:          &createdPods,
+		MaxContainerFailures: &maxContainerFailures,
+	}
+	err = RunRC(config)
+	if err != nil {
+		return podNames, "", err
+	}
+
+	if len(createdPods) != replicas {
+		return podNames, "", fmt.Errorf("Incorrect number of running pods: %v", len(createdPods))
+	}
+
+	for i := range createdPods {
+		podNames[i] = createdPods[i].ObjectMeta.Name
+	}
+	sort.StringSlice(podNames).Sort()
+
+	service, err := c.Services(ns).Get(name)
+	if err != nil {
+		return podNames, "", err
+	}
+	if service.Spec.ClusterIP == "" {
+		return podNames, "", fmt.Errorf("Service IP is blank for %v", name)
+	}
+	serviceIP := service.Spec.ClusterIP
+	return podNames, serviceIP, nil
+}
+
+func stopServeHostnameService(c *client.Client, ns, name string) error {
+	if err := DeleteRC(c, ns, name); err != nil {
+		return err
+	}
+	if err := c.Services(ns).Delete(name); err != nil {
+		return err
+	}
+	return nil
+}
+
+func verifyServeHostnameServiceUp(c *client.Client, host string, expectedPods []string, serviceIP string, servicePort int) error {
+	command := fmt.Sprintf(
+		"for i in $(seq 1 %d); do wget -q -T 1 -O - http://%s:%d || true; echo; done",
+		3*len(expectedPods), serviceIP, servicePort)
+
+	commands := []string{
+		// verify service from node
+		fmt.Sprintf(`set -e; %s | sort -n | uniq`, command),
+		// verify service from container
+		fmt.Sprintf(`set -e;
+			sudo docker pull gcr.io/google_containers/busybox > /dev/null;
+			sudo docker run gcr.io/google_containers/busybox sh -c '%v' | sort -n | uniq`,
+			command),
+	}
+
+	for _, cmd := range commands {
+		passed := false
+		for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5) {
+			stdout, _, code, err := SSH(cmd, host, testContext.Provider)
+			if err != nil || code != 0 {
+				Logf("error while SSH-ing to node: %v (code %v)", err, code)
+			}
+			pods := strings.Split(strings.TrimSpace(stdout), "\n")
+			sort.StringSlice(pods).Sort()
+			if api.Semantic.DeepEqual(pods, expectedPods) {
+				passed = true
+				break
+			}
+			Logf("Expected pods: %v, got: %v", expectedPods, pods)
+		}
+		if !passed {
+			return fmt.Errorf("service verification failed for:\n %s", cmd)
+		}
+	}
+	return nil
+}
+
+func verifyServeHostnameServiceDown(c *client.Client, host string, serviceIP string, servicePort int) error {
+	command := fmt.Sprintf(
+		"curl -s --connect-timeout 2 http://%s:%d && exit 99", serviceIP, servicePort)
+
+	for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5 * time.Second) {
+		_, _, code, err := SSH(command, host, testContext.Provider)
+		if err != nil {
+			Logf("error while SSH-ing to node: %v", err)
+		}
+		if code != 99 {
+			return nil
+		}
+		Logf("service still alive - still waiting")
+	}
+	return fmt.Errorf("waiting for service to be down timed out")
+}
+
 // Does an HTTP GET, but does not reuse TCP connections
 // This masks problems where the iptables rule has changed, but we don't see it
 // This is intended for relatively quick requests (status checks), so we set a short (5 seconds) timeout

test/e2e/util.go

@@ -1760,3 +1760,43 @@ func parseKVLines(output, key string) string {
 	}
 	return ""
 }
+
+func restartKubeProxy(host string) error {
+	// TODO: Make it work for all providers.
+	if !providerIs("gce", "gke", "aws") {
+		return fmt.Errorf("unsupported provider: %s", testContext.Provider)
+	}
+	_, _, code, err := SSH("sudo /etc/init.d/kube-proxy restart", host, testContext.Provider)
+	if err != nil || code != 0 {
+		return fmt.Errorf("couldn't restart kube-proxy: %v (code %v)", err, code)
+	}
+	return nil
+}
+
+func restartApiserver() error {
+	// TODO: Make it work for all providers.
+	if !providerIs("gce", "gke", "aws") {
+		return fmt.Errorf("unsupported provider: %s", testContext.Provider)
+	}
+	var command string
+	if providerIs("gce", "gke") {
+		command = "sudo docker ps | grep /kube-apiserver | cut -d ' ' -f 1 | xargs sudo docker kill"
+	} else {
+		command = "sudo /etc/init.d/kube-apiserver restart"
+	}
+	_, _, code, err := SSH(command, getMasterHost()+":22", testContext.Provider)
+	if err != nil || code != 0 {
+		return fmt.Errorf("couldn't restart apiserver: %v (code %v)", err, code)
+	}
+	return nil
+}
+
+func waitForApiserverUp(c *client.Client) error {
+	for start := time.Now(); time.Since(start) < time.Minute; time.Sleep(5 * time.Second) {
+		body, err := c.Get().AbsPath("/healthz").Do().Raw()
+		if err == nil && string(body) == "ok" {
+			return nil
+		}
+	}
+	return fmt.Errorf("waiting for apiserver timed out")
+}