Differentiate multizone zonal from Regional Cluster.

cluster/gce/gci/configure-helper.sh

@@ -663,6 +663,15 @@ EOF
 multizone = ${MULTIZONE}
 EOF
   fi
+# Multimaster indicates that the cluster is HA.
+# Currently the only HA clusters are regional.
+# If we introduce zonal multimaster this will need to be revisited.
+  if [[ -n "${MULTIMASTER:-}" ]]; then
+    use_cloud_config="true"
+    cat <<EOF >>/etc/gce.conf
+regional = ${MULTIMASTER}
+EOF
+  fi
   if [[ -n "${GCE_ALPHA_FEATURES:-}" ]]; then
     use_cloud_config="true"
     # split GCE_ALPHA_FEATURES into an array by comma.

pkg/cloudprovider/providers/gce/gce.go

@@ -114,6 +114,7 @@ type GCECloud struct {
 	eventRecorder    record.EventRecorder
 	projectID        string
 	region           string
+	regional         bool
 	localZone        string // The zone in which we are running
 	// managedZones will be set to the 1 zone if running a single zone cluster
 	// it will be set to ALL zones in region for any multi-zone cluster
@@ -174,6 +175,7 @@ type ConfigGlobal struct {
 	SecondaryRangeName string   `gcfg:"secondary-range-name"`
 	NodeTags           []string `gcfg:"node-tags"`
 	NodeInstancePrefix string   `gcfg:"node-instance-prefix"`
+	Regional           bool     `gcfg:"regional"`
 	Multizone          bool     `gcfg:"multizone"`
 	// ApiEndpoint is the GCE compute API endpoint to use. If this is blank,
 	// then the default endpoint is used.
@@ -202,6 +204,7 @@ type CloudConfig struct {
 	ProjectID            string
 	NetworkProjectID     string
 	Region               string
+	Regional             bool
 	Zone                 string
 	ManagedZones         []string
 	NetworkName          string
@@ -332,9 +335,14 @@ func generateCloudConfig(configFile *ConfigFile) (cloudConfig *CloudConfig, err
 		return nil, err
 	}
 
+	// Determine if its a regional cluster
+	if configFile != nil && configFile.Global.Regional {
+		cloudConfig.Regional = true
+	}
+
 	// generate managedZones
 	cloudConfig.ManagedZones = []string{cloudConfig.Zone}
-	if configFile != nil && configFile.Global.Multizone {
+	if configFile != nil && (configFile.Global.Multizone || configFile.Global.Regional) {
 		cloudConfig.ManagedZones = nil // Use all zones in region
 	}
 
@@ -512,6 +520,7 @@ func CreateGCECloud(config *CloudConfig) (*GCECloud, error) {
 		networkProjectID:         netProjID,
 		onXPN:                    onXPN,
 		region:                   config.Region,
+		regional:                 config.Regional,
 		localZone:                config.Zone,
 		managedZones:             config.ManagedZones,
 		networkURL:               networkURL,

pkg/cloudprovider/providers/gce/gce_clusters.go

@@ -45,22 +45,27 @@ func (gce *GCECloud) ListClusters(ctx context.Context) ([]string, error) {
 }
 
 func (gce *GCECloud) GetManagedClusters(ctx context.Context) ([]*container.Cluster, error) {
-	var location string
-	if len(gce.managedZones) > 1 {
-		// Multiple managed zones means this is a regional cluster
-		// so use the regional location and not the zone.
-		location = gce.region
-	} else if len(gce.managedZones) == 1 {
-		location = gce.managedZones[0]
+	managedClusters := []*container.Cluster{}
+
+	if gce.regional {
+		var err error
+		managedClusters, err = gce.getClustersInLocation(gce.region)
+		if err != nil {
+			return nil, err
+		}
+	} else if len(gce.managedZones) >= 1 {
+		for _, zone := range gce.managedZones {
+			clusters, err := gce.getClustersInLocation(zone)
+			if err != nil {
+				return nil, err
+			}
+			managedClusters = append(managedClusters, clusters...)
+		}
 	} else {
 		return nil, errors.New(fmt.Sprintf("no zones associated with this cluster(%s)", gce.ProjectID()))
 	}
-	clusters, err := gce.getClustersInLocation(location)
-	if err != nil {
-		return nil, err
-	}
 
-	return clusters, nil
+	return managedClusters, nil
 }
 
 func (gce *GCECloud) Master(ctx context.Context, clusterName string) (string, error) {

pkg/cloudprovider/providers/gce/gce_test.go

@@ -39,6 +39,7 @@ secondary-range-name = my-secondary-range
 node-tags = my-node-tag1
 node-instance-prefix = my-prefix
 multizone = true
+regional = true
    `
 	reader := strings.NewReader(s)
 	config, err := readConfig(reader)
@@ -57,6 +58,7 @@ multizone = true
 		NodeTags:           []string{"my-node-tag1"},
 		NodeInstancePrefix: "my-prefix",
 		Multizone:          true,
+		Regional:           true,
 	}}
 
 	if !reflect.DeepEqual(expected, config) {
@@ -328,6 +330,7 @@ func TestGenerateCloudConfigs(t *testing.T) {
 		NodeTags:           []string{"node-tag"},
 		NodeInstancePrefix: "node-prefix",
 		Multizone:          false,
+		Regional:           false,
 		ApiEndpoint:        "",
 		LocalZone:          "us-central1-a",
 		AlphaFeatures:      []string{},
@@ -447,6 +450,20 @@ func TestGenerateCloudConfigs(t *testing.T) {
 			},
 		},
 		{
+			name: "Regional",
+			config: func() ConfigGlobal {
+				v := configBoilerplate
+				v.Regional = true
+				return v
+			},
+			cloud: func() CloudConfig {
+				v := cloudBoilerplate
+				v.Regional = true
+				v.ManagedZones = nil
+				return v
+			},
+		},
+		{
 			name: "Secondary Range Name",
 			config: func() ConfigGlobal {
 				v := configBoilerplate