Implement 'Nodes Network' test for GKE; add optional verbose SSH.

cluster/gke/util.sh

@@ -210,18 +210,17 @@ function get-password() {
     | grep password | cut -f 4 -d ' ')
 }
 
-# Detect the instance name and IP for the master
+# Detect the IP for the master. Note that on GKE, we don't know the name of the
+# master, so KUBE_MASTER is not set.
 #
 # Assumed vars:
 #   ZONE
 #   CLUSTER_NAME
 # Vars set:
-#   KUBE_MASTER
 #   KUBE_MASTER_IP
 function detect-master() {
   echo "... in gke:detect-master()" >&2
   detect-project >&2
-  KUBE_MASTER="k8s-${CLUSTER_NAME}-master"
   KUBE_MASTER_IP=$("${GCLOUD}" "${CMD_GROUP}" container clusters describe \
     --project="${PROJECT}" --zone="${ZONE}" "${CLUSTER_NAME}" \
     | grep endpoint | cut -f 2 -d ' ')

hack/ginkgo-e2e.sh

@@ -89,7 +89,7 @@ fi
 export PATH=$(dirname "${e2e_test}"):"${PATH}"
 "${ginkgo}" "${ginkgo_args[@]:+${ginkgo_args[@]}}" "${e2e_test}" -- \
   "${auth_config[@]:+${auth_config[@]}}" \
-  --host="https://${KUBE_MASTER_IP-}" \
+  --host="https://${KUBE_MASTER_IP:-}" \
   --provider="${KUBERNETES_PROVIDER}" \
   --gce-project="${PROJECT:-}" \
   --gce-zone="${ZONE:-}" \

test/e2e/resize_nodes.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"os/exec"
 	"regexp"
+	"strings"
 	"time"
 
 	"k8s.io/kubernetes/pkg/api"
@@ -35,10 +36,11 @@ import (
 	"k8s.io/kubernetes/pkg/cloudprovider/aws"
 )
 
-const serveHostnameImage = "gcr.io/google_containers/serve_hostname:1.1"
-
-const resizeNodeReadyTimeout = 2 * time.Minute
-const resizeNodeNotReadyTimeout = 2 * time.Minute
+const (
+	serveHostnameImage        = "gcr.io/google_containers/serve_hostname:1.1"
+	resizeNodeReadyTimeout    = 2 * time.Minute
+	resizeNodeNotReadyTimeout = 2 * time.Minute
+)
 
 func resizeGroup(size int) error {
 	if testContext.Provider == "gce" || testContext.Provider == "gke" {
@@ -312,23 +314,25 @@ func performTemporaryNetworkFailure(c *client.Client, ns, rcName string, replica
 	if host == "" {
 		Failf("Couldn't get the external IP of host %s with addresses %v", node.Name, node.Status.Addresses)
 	}
-	By(fmt.Sprintf("block network traffic from node %s to the master", node.Name))
 
-	// TODO marekbiskup 2015-06-19 #10085
-	// The use of MasterName will cause iptables to do a DNS lookup to
-	// resolve the name to an IP address, which will slow down the test
-	// and cause it to fail if DNS is absent or broken.
-	// Use the IP address instead.
-
-	destination := testContext.CloudConfig.MasterName
-	if providerIs("aws") {
-		// This is the (internal) IP address used on AWS for the master
-		// TODO: Use IP address for all clouds?
-		// TODO: Avoid hard-coding this
-		destination = "172.20.0.9"
+	By(fmt.Sprintf("block network traffic from node %s to the master", node.Name))
+	master := ""
+	switch testContext.Provider {
+	case "gce":
+		// TODO(#10085): The use of MasterName will cause iptables to do a DNS
+		// lookup to resolve the name to an IP address, which will slow down the
+		// test and cause it to fail if DNS is absent or broken. Use the
+		// internal IP address instead (i.e. NOT the one in testContext.Host).
+		master = testContext.CloudConfig.MasterName
+	case "gke":
+		master = strings.TrimPrefix(testContext.Host, "https://")
+	case "aws":
+		// TODO(justinsb): Avoid hardcoding this.
+		master = "172.20.0.9"
+	default:
+		Failf("This test is not supported for provider %s and should be disabled", testContext.Provider)
 	}
-
-	iptablesRule := fmt.Sprintf("OUTPUT --destination %s --jump DROP", destination)
+	iptablesRule := fmt.Sprintf("OUTPUT --destination %s --jump DROP", master)
 	defer func() {
 		// This code will execute even if setting the iptables rule failed.
 		// It is on purpose because we may have an error even if the new rule
@@ -344,7 +348,7 @@ func performTemporaryNetworkFailure(c *client.Client, ns, rcName string, replica
 		// may fail). Manual intervention is required in such case (recreating the
 		// cluster solves the problem too).
 		err := wait.Poll(time.Millisecond*100, time.Second*30, func() (bool, error) {
-			_, _, code, err := SSH(undropCmd, host, testContext.Provider)
+			_, _, code, err := SSHVerbose(undropCmd, host, testContext.Provider)
 			if code == 0 && err == nil {
 				return true, nil
 			} else {
@@ -370,7 +374,7 @@ func performTemporaryNetworkFailure(c *client.Client, ns, rcName string, replica
 	// We could also block network traffic from the master(s) to this node,
 	// but blocking it one way is sufficient for this test.
 	dropCmd := fmt.Sprintf("sudo iptables --insert %s", iptablesRule)
-	if _, _, code, err := SSH(dropCmd, host, testContext.Provider); code != 0 || err != nil {
+	if _, _, code, err := SSHVerbose(dropCmd, host, testContext.Provider); code != 0 || err != nil {
 		Failf("Expected 0 exit code and nil error when running %s on %s, got %d and %v",
 			dropCmd, node.Name, code, err)
 	}

test/e2e/util.go

@@ -1480,15 +1480,39 @@ func NodeSSHHosts(c *client.Client) ([]string, error) {
 // is no error performing the SSH, the stdout, stderr, and exit code are
 // returned.
 func SSH(cmd, host, provider string) (string, string, int, error) {
+	return sshCore(cmd, host, provider, false)
+}
+
+// SSHVerbose is just like SSH, but it logs the command, user, host, stdout,
+// stderr, exit code, and error.
+func SSHVerbose(cmd, host, provider string) (string, string, int, error) {
+	return sshCore(cmd, host, provider, true)
+}
+
+func sshCore(cmd, host, provider string, verbose bool) (string, string, int, error) {
 	// Get a signer for the provider.
 	signer, err := getSigner(provider)
 	if err != nil {
 		return "", "", 0, fmt.Errorf("error getting signer for provider %s: '%v'", provider, err)
 	}
 
+	// RunSSHCommand will default to Getenv("USER") if user == "", but we're
+	// defaulting here as well for logging clarity.
 	user := os.Getenv("KUBE_SSH_USER")
-	// RunSSHCommand will default to Getenv("USER") if user == ""
-	return util.RunSSHCommand(cmd, user, host, signer)
+	if user == "" {
+		user = os.Getenv("USER")
+	}
+
+	stdout, stderr, code, err := util.RunSSHCommand(cmd, user, host, signer)
+	if verbose {
+		remote := fmt.Sprintf("%s@%s", user, host)
+		Logf("[%s] Running    `%s`", remote, cmd)
+		Logf("[%s] stdout:    %q", remote, stdout)
+		Logf("[%s] stderr:    %q", remote, stderr)
+		Logf("[%s] exit code: %d", remote, code)
+		Logf("[%s] error:     %v", remote, err)
+	}
+	return stdout, stderr, code, err
 }
 
 // getSigner returns an ssh.Signer for the provider ("gce", etc.) that can be