[Feature] Add agency leader service (#991)

CHANGELOG.md

@@ -10,6 +10,7 @@
 - (Feature) Add operator shutdown handler for graceful termination
 - (Feature) Add agency leader discovery
 - (Feature) Add `ACSDeploymentSynced` condition type and fix comparison of `SecretHashes` method
+- (Feature) Add agency leader service
 
 ## [1.2.12](https://github.com/arangodb/kube-arangodb/tree/1.2.12) (2022-05-10)
 - (Feature) Add CoreV1 Endpoints Inspector

pkg/deployment/agency/cache.go

@@ -31,7 +31,15 @@ import (
 	"github.com/arangodb/kube-arangodb/pkg/util/errors"
 )
 
-type health map[string]uint64
+type health struct {
+	leaderID string
+
+	commitIndexes map[string]uint64
+}
+
+func (h health) LeaderID() string {
+	return h.leaderID
+}
 
 // IsHealthy returns true if all agencies have the same commit index.
 // Returns false when:
@@ -42,7 +50,7 @@ func (h health) IsHealthy() bool {
 	var globalCommitIndex uint64
 	first := true
 
-	for _, commitIndex := range h {
+	for _, commitIndex := range h.commitIndexes {
 		if first {
 			globalCommitIndex = commitIndex
 			first = false
@@ -58,14 +66,15 @@ func (h health) IsHealthy() bool {
 type Health interface {
 	// IsHealthy return true when environment is considered as healthy.
 	IsHealthy() bool
+
+	// LeaderID returns a leader ID or empty string if a leader is not known.
+	LeaderID() string
 }
 
 type Cache interface {
 	Reload(ctx context.Context, clients []agency.Agency) (uint64, error)
 	Data() (State, bool)
 	CommitIndex() uint64
-	// GetLeaderID returns a leader ID.
-	GetLeaderID() string
 	// Health returns true when healthy object is available.
 	Health() (Health, bool)
 }
@@ -93,11 +102,6 @@ func (c cacheSingle) CommitIndex() uint64 {
 	return 0
 }
 
-// GetLeaderID returns always empty string for a single cache.
-func (c cacheSingle) GetLeaderID() string {
-	return ""
-}
-
 // Health returns always false for single cache.
 func (c cacheSingle) Health() (Health, bool) {
 	return nil, false
@@ -121,8 +125,6 @@ type cache struct {
 	data State
 
 	health Health
-
-	leaderID string
 }
 
 func (c *cache) CommitIndex() uint64 {
@@ -139,14 +141,6 @@ func (c *cache) Data() (State, bool) {
 	return c.data, c.valid
 }
 
-// GetLeaderID returns a leader ID or empty string if a leader is not known.
-func (c *cache) GetLeaderID() string {
-	c.lock.RLock()
-	defer c.lock.RUnlock()
-
-	return c.leaderID
-}
-
 // Health returns always false for single cache.
 func (c *cache) Health() (Health, bool) {
 	c.lock.RLock()
@@ -167,7 +161,6 @@ func (c *cache) Reload(ctx context.Context, clients []agency.Agency) (uint64, er
 	if err != nil {
 		// Invalidate a leader ID and agency state.
 		// In the next iteration leaderID will be sat because `valid` will be false.
-		c.leaderID = ""
 		c.valid = false
 
 		return 0, err
@@ -180,7 +173,6 @@ func (c *cache) Reload(ctx context.Context, clients []agency.Agency) (uint64, er
 	}
 
 	// A leader should be known even if an agency state is invalid.
-	c.leaderID = leaderConfig.LeaderId
 	if data, err := loadState(ctx, leaderCli); err != nil {
 		c.valid = false
 		return leaderConfig.CommitIndex, err
@@ -194,7 +186,7 @@ func (c *cache) Reload(ctx context.Context, clients []agency.Agency) (uint64, er
 
 // getLeader returns config and client to a leader agency, and health to check if agencies are on the same page.
 // If there is no quorum for the leader then error is returned.
-func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *agencyConfig, Health, error) {
+func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *Config, Health, error) {
 	var mutex sync.Mutex
 	var anyError error
 	var wg sync.WaitGroup
@@ -203,10 +195,12 @@ func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *ag
 	if cliLen == 0 {
 		return nil, nil, nil, errors.New("empty list of agencies' clients")
 	}
-	configs := make([]*agencyConfig, cliLen)
-	leaders := make(map[string]int)
+	configs := make([]*Config, cliLen)
+	leaders := make(map[string]int, cliLen)
 
-	h := make(health)
+	var h health
+
+	h.commitIndexes = make(map[string]uint64, cliLen)
 	// Fetch all configs from agencies.
 	wg.Add(cliLen)
 	for i, cli := range clients {
@@ -215,7 +209,7 @@ func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *ag
 
 			ctxLocal, cancel := context.WithTimeout(ctx, time.Second)
 			defer cancel()
-			config, err := getAgencyConfig(ctxLocal, cliLocal)
+			config, err := GetAgencyConfig(ctxLocal, cliLocal)
 
 			mutex.Lock()
 			defer mutex.Unlock()
@@ -232,7 +226,7 @@ func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *ag
 			configs[iLocal] = config
 			// Count leaders.
 			leaders[config.LeaderId]++
-			h[config.Configuration.ID] = config.CommitIndex
+			h.commitIndexes[config.Configuration.ID] = config.CommitIndex
 		}(i, cli)
 	}
 	wg.Wait()
@@ -255,6 +249,8 @@ func getLeader(ctx context.Context, clients []agency.Agency) (agency.Agency, *ag
 		}
 	}
 
+	h.leaderID = leaderID
+
 	// Check if a leader has quorum from all possible agencies.
 	if maxVotes <= cliLen/2 {
 		message := fmt.Sprintf("no quorum for leader %s, votes %d of %d", leaderID, maxVotes, cliLen)

pkg/deployment/agency/config.go

@@ -29,10 +29,12 @@ import (
 	"github.com/arangodb/go-driver/agency"
 )
 
-func getAgencyConfig(ctx context.Context, client agency.Agency) (*agencyConfig, error) {
-	conn := client.Connection()
+func GetAgencyConfig(ctx context.Context, client agency.Agency) (*Config, error) {
+	return GetAgencyConfigC(ctx, client.Connection())
+}
 
-	req, err := client.Connection().NewRequest(http.MethodGet, "/_api/agency/config")
+func GetAgencyConfigC(ctx context.Context, conn driver.Connection) (*Config, error) {
+	req, err := conn.NewRequest(http.MethodGet, "/_api/agency/config")
 	if err != nil {
 		return nil, err
 	}
@@ -48,7 +50,7 @@ func getAgencyConfig(ctx context.Context, client agency.Agency) (*agencyConfig,
 		return nil, err
 	}
 
-	var c agencyConfig
+	var c Config
 
 	if err := json.Unmarshal(data, &c); err != nil {
 		return nil, err
@@ -57,7 +59,7 @@ func getAgencyConfig(ctx context.Context, client agency.Agency) (*agencyConfig,
 	return &c, nil
 }
 
-type agencyConfig struct {
+type Config struct {
 	LeaderId string `json:"leaderId"`
 
 	CommitIndex uint64 `json:"commitIndex"`

pkg/deployment/agency/config_test.go

@@ -67,7 +67,7 @@ func Test_Config_Unmarshal(t *testing.T) {
   "version": "3.10.0-devel"
 }`
 
-	var cfg agencyConfig
+	var cfg Config
 
 	require.NoError(t, json.Unmarshal([]byte(data), &cfg))
 

pkg/deployment/deployment.go

@@ -154,6 +154,10 @@ func (d *Deployment) GetAgencyCache() (agency.State, bool) {
 	return d.agencyCache.Data()
 }
 
+func (d *Deployment) GetAgencyHealth() (agency.Health, bool) {
+	return d.agencyCache.Health()
+}
+
 func (d *Deployment) RefreshAgencyCache(ctx context.Context) (uint64, error) {
 	if d.apiObject.Spec.Mode.Get() == api.DeploymentModeSingle {
 		return 0, nil

pkg/deployment/deployment_inspector.go

@@ -188,6 +188,10 @@ func (d *Deployment) inspectDeploymentWithError(ctx context.Context, lastInterva
 		nextInterval = nextInterval.ReduceTo(x)
 	}
 
+	if err := d.resources.EnsureLeader(ctx, d.GetCachedStatus()); err != nil {
+		return minInspectionInterval, errors.Wrapf(err, "Creating agency pod leader failed")
+	}
+
 	if err := d.resources.EnsureArangoMembers(ctx, d.GetCachedStatus()); err != nil {
 		return minInspectionInterval, errors.Wrapf(err, "ArangoMember creation failed")
 	}

pkg/deployment/reconcile/action_context.go

@@ -187,6 +187,10 @@ func (ac *actionContext) GenerateMemberEndpoint(group api.ServerGroup, member ap
 	return ac.context.GenerateMemberEndpoint(group, member)
 }
 
+func (ac *actionContext) GetAgencyHealth() (agencyCache.Health, bool) {
+	return ac.context.GetAgencyHealth()
+}
+
 func (ac *actionContext) GetAgencyCache() (agencyCache.State, bool) {
 	return ac.context.GetAgencyCache()
 }

pkg/deployment/reconcile/plan_builder_test.go

@@ -84,6 +84,11 @@ type testContext struct {
 	Inspector inspectorInterface.Inspector
 }
 
+func (c *testContext) GetAgencyHealth() (agencyCache.Health, bool) {
+	//TODO implement me
+	panic("implement me")
+}
+
 func (c *testContext) RenderPodForMember(ctx context.Context, acs sutil.ACS, spec api.DeploymentSpec, status api.DeploymentStatus, memberID string, imageInfo api.ImageInfo) (*core.Pod, error) {
 	//TODO implement me
 	panic("implement me")

pkg/deployment/reconciler/context.go

@@ -124,6 +124,7 @@ type DeploymentCachedStatus interface {
 
 type ArangoAgencyGet interface {
 	GetAgencyCache() (agencyCache.State, bool)
+	GetAgencyHealth() (agencyCache.Health, bool)
 }
 
 type ArangoAgency interface {

pkg/deployment/resources/pod_leader.go

@@ -0,0 +1,151 @@
+//
+// DISCLAIMER
+//
+// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
+//
+// 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.
+//
+// Copyright holder is ArangoDB GmbH, Cologne, Germany
+//
+
+package resources
+
+import (
+	"context"
+
+	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
+	"github.com/arangodb/kube-arangodb/pkg/apis/shared"
+	"github.com/arangodb/kube-arangodb/pkg/deployment/patch"
+	"github.com/arangodb/kube-arangodb/pkg/util/errors"
+	"github.com/arangodb/kube-arangodb/pkg/util/globals"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
+	inspectorInterface "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector"
+)
+
+// EnsureLeader creates leader label on the pod's agency and creates service to it.
+// When agency leader is not known then all agencies' pods should not have leader label, and
+// consequentially service will not point to any pod.
+// It works only in active fail-over mode.
+func (r *Resources) EnsureLeader(ctx context.Context, cachedStatus inspectorInterface.Inspector) error {
+	if r.context.GetSpec().GetMode() != api.DeploymentModeActiveFailover {
+		return nil
+	}
+
+	cache, ok := r.context.GetAgencyHealth()
+	if !ok {
+		return nil
+	}
+
+	leaderID := cache.LeaderID()
+	status, _ := r.context.GetStatus()
+	noLeader := len(leaderID) == 0
+	changed := false
+	group := api.ServerGroupAgents
+	agencyServers := func(group api.ServerGroup, list api.MemberStatusList) error {
+		for _, m := range list {
+			pod, exist := cachedStatus.Pod().V1().GetSimple(m.PodName)
+			if !exist {
+				continue
+			}
+
+			labels := pod.GetLabels()
+			if noLeader || m.ID != leaderID {
+				// Unset a leader when:
+				// - leader is unknown.
+				// - leader does not belong to the current pod.
+
+				if _, ok := labels[k8sutil.LabelKeyArangoLeader]; ok {
+					delete(labels, k8sutil.LabelKeyArangoLeader)
+
+					err := r.context.ApplyPatchOnPod(ctx, pod, patch.ItemReplace(patch.NewPath("metadata", "labels"), labels))
+					if err != nil {
+						r.log.Error().Err(err).Msgf("Unable to remove leader label")
+						return err
+					}
+
+					r.log.Info().Msgf("leader label is removed from \"%s\" member", m.ID)
+					changed = true
+				}
+
+				continue
+			}
+
+			// From here on it is known that there is a leader, and it should be attached to the current pod.
+			if value, ok := labels[k8sutil.LabelKeyArangoLeader]; !ok {
+				labels = addLabel(labels, k8sutil.LabelKeyArangoLeader, "true")
+			} else if value != "true" {
+				labels = addLabel(labels, k8sutil.LabelKeyArangoLeader, "true")
+			} else {
+				// A pod is already a leader, so nothing to change.
+				continue
+			}
+
+			err := r.context.ApplyPatchOnPod(ctx, pod, patch.ItemReplace(patch.NewPath("metadata", "labels"), labels))
+			if err != nil {
+				r.log.Error().Err(err).Msgf("Unable to update leader label")
+				return err
+			}
+			r.log.Info().Msgf("leader label is set on \"%s\" member", m.ID)
+			changed = true
+		}
+
+		return nil
+	}
+
+	if err := status.Members.ForeachServerInGroups(agencyServers, group); err != nil {
+		return err
+	}
+
+	if changed {
+		return errors.Reconcile()
+	}
+	changed = false
+
+	if noLeader {
+		// There is no leader agency so service may not exist, or it can exist with empty list of endpoints.
+		return nil
+	}
+
+	leaderAgentSvcName := k8sutil.CreateAgentLeaderServiceName(r.context.GetAPIObject().GetName())
+	deploymentName := r.context.GetAPIObject().GetName()
+
+	selector := k8sutil.LabelsForLeaderMember(deploymentName, group.AsRole(), leaderID)
+	if s, ok := cachedStatus.Service().V1().GetSimple(leaderAgentSvcName); ok {
+		if err, adjusted := r.adjustService(ctx, s, shared.ArangoPort, selector); err == nil {
+			if !adjusted {
+				// The service is not changed.
+				return nil
+			}
+
+			return errors.Reconcile()
+		} else {
+			return err
+		}
+	}
+
+	s := r.createService(leaderAgentSvcName, r.context.GetNamespace(), r.context.GetAPIObject().AsOwner(), shared.ArangoPort, selector)
+	err := globals.GetGlobalTimeouts().Kubernetes().RunWithTimeout(ctx, func(ctxChild context.Context) error {
+		_, err := r.context.ServicesModInterface().Create(ctxChild, s, meta.CreateOptions{})
+		return err
+	})
+	if err != nil {
+		if !k8sutil.IsConflict(err) {
+			return err
+		}
+	}
+
+	// The service has been created.
+	return errors.Reconcile()
+}

pkg/deployment/resources/services.go

@@ -36,12 +36,13 @@ import (
 	core "k8s.io/api/core/v1"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
 
+	"github.com/rs/zerolog"
+
 	api "github.com/arangodb/kube-arangodb/pkg/apis/deployment/v1"
 	"github.com/arangodb/kube-arangodb/pkg/apis/shared"
 	"github.com/arangodb/kube-arangodb/pkg/metrics"
 	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil"
 	servicev1 "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/service/v1"
-	"github.com/rs/zerolog"
 )
 
 var (
@@ -49,8 +50,73 @@ var (
 	inspectServicesDurationGauges = metrics.MustRegisterGaugeVec(metricsComponent, "inspect_services_duration", "Amount of time taken by a single inspection of all Services for a deployment (in sec)", metrics.DeploymentName)
 )
 
+// createService returns service's object.
+func (r *Resources) createService(name, namespace string, owner meta.OwnerReference, targetPort int32,
+	selector map[string]string) *core.Service {
+
+	return &core.Service{
+		ObjectMeta: meta.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+			OwnerReferences: []meta.OwnerReference{
+				owner,
+			},
+		},
+		Spec: core.ServiceSpec{
+			Type: core.ServiceTypeClusterIP,
+			Ports: []core.ServicePort{
+				{
+					Name:       "server",
+					Protocol:   "TCP",
+					Port:       shared.ArangoPort,
+					TargetPort: intstr.IntOrString{IntVal: targetPort},
+				},
+			},
+			PublishNotReadyAddresses: true,
+			Selector:                 selector,
+		},
+	}
+}
+
+// adjustService checks whether service contains is valid and if not than it reconciles service.
+// Returns true if service is adjusted.
+func (r *Resources) adjustService(ctx context.Context, s *core.Service, targetPort int32, selector map[string]string) (error, bool) {
+	services := r.context.ServicesModInterface()
+	spec := s.Spec.DeepCopy()
+
+	spec.Type = core.ServiceTypeClusterIP
+	spec.Ports = []core.ServicePort{
+		{
+			Name:       "server",
+			Protocol:   "TCP",
+			Port:       shared.ArangoPort,
+			TargetPort: intstr.IntOrString{IntVal: targetPort},
+		},
+	}
+	spec.PublishNotReadyAddresses = true
+	spec.Selector = selector
+	if equality.Semantic.DeepDerivative(*spec, s.Spec) {
+		// The service has not changed, so nothing should be changed.
+		return nil, false
+	}
+
+	s.Spec = *spec
+	err := globals.GetGlobalTimeouts().Kubernetes().RunWithTimeout(ctx, func(ctxChild context.Context) error {
+		_, err := services.Update(ctxChild, s, meta.UpdateOptions{})
+		return err
+	})
+	if err != nil {
+		return err, false
+	}
+
+	// The service has been changed.
+	return nil, true
+
+}
+
 // EnsureServices creates all services needed to service the deployment
 func (r *Resources) EnsureServices(ctx context.Context, cachedStatus inspectorInterface.Inspector) error {
+
 	log := r.log
 	start := time.Now()
 	apiObject := r.context.GetAPIObject()
@@ -85,29 +151,9 @@ func (r *Resources) EnsureServices(ctx context.Context, cachedStatus inspectorIn
 				return errors.Newf("Member %s not found", memberName)
 			}
 
+			selector := k8sutil.LabelsForMember(deploymentName, group.AsRole(), m.ID)
 			if s, ok := cachedStatus.Service().V1().GetSimple(member.GetName()); !ok {
-				s = &core.Service{
-					ObjectMeta: meta.ObjectMeta{
-						Name:      member.GetName(),
-						Namespace: member.GetNamespace(),
-						OwnerReferences: []meta.OwnerReference{
-							member.AsOwner(),
-						},
-					},
-					Spec: core.ServiceSpec{
-						Type: core.ServiceTypeClusterIP,
-						Ports: []core.ServicePort{
-							{
-								Name:       "server",
-								Protocol:   "TCP",
-								Port:       shared.ArangoPort,
-								TargetPort: intstr.IntOrString{IntVal: targetPort},
-							},
-						},
-						PublishNotReadyAddresses: true,
-						Selector:                 k8sutil.LabelsForMember(deploymentName, group.AsRole(), m.ID),
-					},
-				}
+				s := r.createService(member.GetName(), member.GetNamespace(), member.AsOwner(), targetPort, selector)
 
 				err := globals.GetGlobalTimeouts().Kubernetes().RunWithTimeout(ctx, func(ctxChild context.Context) error {
 					_, err := svcs.Create(ctxChild, s, meta.CreateOptions{})
@@ -122,33 +168,13 @@ func (r *Resources) EnsureServices(ctx context.Context, cachedStatus inspectorIn
 				reconcileRequired.Required()
 				continue
 			} else {
-				spec := s.Spec.DeepCopy()
-
-				spec.Type = core.ServiceTypeClusterIP
-				spec.Ports = []core.ServicePort{
-					{
-						Name:       "server",
-						Protocol:   "TCP",
-						Port:       shared.ArangoPort,
-						TargetPort: intstr.IntOrString{IntVal: targetPort},
-					},
-				}
-				spec.PublishNotReadyAddresses = true
-				spec.Selector = k8sutil.LabelsForMember(deploymentName, group.AsRole(), m.ID)
-
-				if !equality.Semantic.DeepDerivative(*spec, s.Spec) {
-					s.Spec = *spec
-
-					err := globals.GetGlobalTimeouts().Kubernetes().RunWithTimeout(ctx, func(ctxChild context.Context) error {
-						_, err := svcs.Update(ctxChild, s, meta.UpdateOptions{})
-						return err
-					})
-					if err != nil {
-						return err
+				if err, adjusted := r.adjustService(ctx, s, targetPort, selector); err == nil {
+					if adjusted {
+						reconcileRequired.Required()
 					}
-
-					reconcileRequired.Required()
-					continue
+					// Continue the loop.
+				} else {
+					return err
 				}
 			}
 		}

pkg/util/k8sutil/services.go

@@ -27,14 +27,13 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/service"
-
-	"github.com/arangodb/kube-arangodb/pkg/util/errors"
-
-	"github.com/arangodb/kube-arangodb/pkg/apis/shared"
-	servicev1 "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/service/v1"
 	core "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	"github.com/arangodb/kube-arangodb/pkg/apis/shared"
+	"github.com/arangodb/kube-arangodb/pkg/util/errors"
+	"github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/service"
+	servicev1 "github.com/arangodb/kube-arangodb/pkg/util/k8sutil/inspector/service/v1"
 )
 
 // CreateHeadlessServiceName returns the name of the headless service for the given
@@ -67,6 +66,11 @@ func CreateExporterClientServiceName(deploymentName string) string {
 	return deploymentName + "-exporter"
 }
 
+// CreateAgentLeaderServiceName returns the name of the service used to access a leader agent.
+func CreateAgentLeaderServiceName(deploymentName string) string {
+	return deploymentName + "-agent"
+}
+
 // CreateExporterService
 func CreateExporterService(ctx context.Context, cachedStatus service.Inspector, svcs servicev1.ModInterface,
 	deployment metav1.Object, owner metav1.OwnerReference) (string, bool, error) {

pkg/util/k8sutil/util.go

@@ -44,7 +44,8 @@ const (
 	LabelKeyArangoScheduled = "deployment.arangodb.com/scheduled"
 	// LabelKeyArangoTopology is the key of the label used to store the ArangoDeployment topology ID in
 	LabelKeyArangoTopology = "deployment.arangodb.com/topology"
-
+	// LabelKeyArangoLeader is the key of the label used to store the current leader of a group instances.
+	LabelKeyArangoLeader = "deployment.arangodb.com/leader"
 	// AppName is the fixed value for the "app" label
 	AppName = "arangodb"
 )
@@ -98,6 +99,14 @@ func LabelsForMember(deploymentName, role, id string) map[string]string {
 	return l
 }
 
+// LabelsForLeaderMember returns a map of labels for given deployment name and member id and role and leadership.
+func LabelsForLeaderMember(deploymentName, role, id string) map[string]string {
+	l := LabelsForMember(deploymentName, role, id)
+	l[LabelKeyArangoLeader] = "true"
+
+	return l
+}
+
 // LabelsForDeployment returns a map of labels, given to all resources for given deployment name
 func LabelsForDeployment(deploymentName, role string) map[string]string {
 	l := map[string]string{