diff --git a/cli/cage/main.go b/cli/cage/main.go
index 07ff4fc..c600972 100644
--- a/cli/cage/main.go
+++ b/cli/cage/main.go
@@ -20,7 +20,6 @@ func main() {
 	envars := &cage.Envars{
 		Region:                      aws.String(""),
 		Cluster:                     aws.String(""),
-		LoadBalancerArn:             aws.String(""),
 		NextServiceName:             aws.String(""),
 		NextServiceDefinitionBase64: aws.String(""),
 		CurrentServiceName:          aws.String(""),
@@ -47,7 +46,7 @@ func main() {
 			Usage: "generate config file skeleton json",
 		},
 		cli.BoolFlag{
-			Name: "dry-run",
+			Name: "dryRun",
 			Usage: "describe roll out plan without affecting any resources",
 		},
 		cli.StringFlag{
@@ -63,12 +62,6 @@ func main() {
 			Usage:       "ecs cluster name",
 			Destination: envars.Cluster,
 		},
-		cli.StringFlag{
-			Name:        "loadBalancerArn",
-			EnvVar:      cage.LoadBalancerArnKey,
-			Usage:       "full arn of service load balancer",
-			Destination: envars.LoadBalancerArn,
-		},
 		cli.StringFlag{
 			Name:        "nextServiceName",
 			EnvVar:      cage.NextServiceNameKey,
@@ -143,7 +136,7 @@ func main() {
 		if err != nil {
 			log.Fatalf(err.Error())
 		}
-		if ctx.Bool("dry-run") {
+		if ctx.Bool("dryRun") {
 			DryRun(envars)
 		} else {
 			if err := Action(envars); err != nil {
diff --git a/env.go b/env.go
index b57a450..65ff35d 100644
--- a/env.go
+++ b/env.go
@@ -9,7 +9,6 @@ type Envars struct {
 	_                           struct{} `type:"struct"`
 	Region                      *string  `json:"region" type:"string"`
 	Cluster                     *string  `json:"cluster" type:"string" required:"true"`
-	LoadBalancerArn             *string  `json:"loadBalancerArn" type:"string" required:"true"`
 	NextServiceName             *string  `json:"nextServiceName" type:"string" required:"true"`
 	CurrentServiceName          *string  `json:"currentServiceName" type:"string" required:"true"`
 	NextServiceDefinitionBase64 *string  `json:"nextServiceDefinitionBase64" type:"string"`
@@ -24,7 +23,6 @@ type Envars struct {
 const ClusterKey = "CAGE_ECS_CLUSTER"
 const NextServiceNameKey = "CAGE_NEXT_SERVICE_NAME"
 const CurrentServiceNameKey = "CAGE_CURRENT_SERVICE_NAME"
-const LoadBalancerArnKey = "CAGE_LB_ARN"
 
 // either required
 const NextTaskDefinitionBase64Key = "CAGE_NEXT_TASK_DEFINITION_BASE64"
@@ -53,8 +51,6 @@ func EnsureEnvars(
 	// required
 	if isEmpty(dest.Cluster) {
 		return NewErrorf("--cluster [%s] is required", ClusterKey)
-	} else if isEmpty(dest.LoadBalancerArn) {
-		return NewErrorf("--loadBalancerArn [%s] is required", LoadBalancerArnKey)
 	} else if isEmpty(dest.CurrentServiceName) {
 		return NewErrorf("--currentServiceName [%s] is required", CurrentServiceNameKey)
 	} else if isEmpty(dest.NextServiceName) {
diff --git a/env_test.go b/env_test.go
index bff5dc2..ef91ad2 100644
--- a/env_test.go
+++ b/env_test.go
@@ -17,7 +17,6 @@ func TestEnsureEnvars(t *testing.T) {
 		CurrentServiceName:          aws.String("service-current"),
 		NextTaskDefinitionBase64:    aws.String("hoge"),
 		NextServiceDefinitionBase64: aws.String("next"),
-		LoadBalancerArn:             aws.String("lb"),
 		AvailabilityThreshold:       aws.Float64(0.9),
 		ResponseTimeThreshold:       aws.Float64(0.5),
 		RollOutPeriod:               aws.Int64(60),
@@ -33,7 +32,6 @@ func TestEnsureEnvars4(t *testing.T) {
 		CurrentServiceName:       aws.String("service"),
 		NextTaskDefinitionBase64: aws.String("current"),
 		NextServiceName:          aws.String("next"),
-		LoadBalancerArn:          aws.String("lb"),
 	}
 	if err := EnsureEnvars(e); err != nil {
 		t.Fatalf(err.Error())
@@ -48,7 +46,6 @@ func TestEnsureEnvars2(t *testing.T) {
 		CurrentServiceNameKey,
 		NextTaskDefinitionBase64Key,
 		ClusterKey,
-		LoadBalancerArnKey,
 	}
 	for i, v := range arr {
 		m := make(map[string]*string)
@@ -56,7 +53,6 @@ func TestEnsureEnvars2(t *testing.T) {
 		m[CurrentServiceNameKey] = dummy
 		m[NextTaskDefinitionBase64Key] = dummy
 		m[ClusterKey] = dummy
-		m[LoadBalancerArnKey] = dummy
 		for j, u := range arr {
 			if i == j {
 				m[u] = nil
@@ -67,7 +63,6 @@ func TestEnsureEnvars2(t *testing.T) {
 			NextServiceName:          m[NextServiceNameKey],
 			NextTaskDefinitionBase64: m[NextTaskDefinitionBase64Key],
 			Cluster:                  m[ClusterKey],
-			LoadBalancerArn:          m[LoadBalancerArnKey],
 		}
 		err := EnsureEnvars(e)
 		if err == nil {
@@ -83,7 +78,6 @@ func dummyEnvs() *Envars {
 		NextServiceName:          dummy,
 		NextTaskDefinitionBase64: dummy,
 		Cluster:                  dummy,
-		LoadBalancerArn:          dummy,
 	}
 }
 func TestEnsureEnvars3(t *testing.T) {
@@ -123,7 +117,6 @@ func TestUnmarshalEnvars(t *testing.T) {
 	}
 	assert.Equal(t, "us-east-2", *dest.Region)
 	assert.Equal(t, "cluster", *dest.Cluster)
-	assert.Equal(t, "arn://lb", *dest.LoadBalancerArn)
 	assert.Equal(t, "service-next", *dest.NextServiceName)
 	assert.Equal(t, "service-current", *dest.CurrentServiceName)
 	assert.Equal(t, "next-task", *dest.NextTaskDefinitionBase64)
diff --git a/metrics.go b/metrics.go
index 3d3de69..7ebacbe 100644
--- a/metrics.go
+++ b/metrics.go
@@ -81,6 +81,7 @@ func (envars *Envars) GetServiceMetricStatistics(
 
 func (envars *Envars) AccumulatePeriodicServiceHealth(
 	cw cloudwatchiface.CloudWatchAPI,
+	loadBalancerArn *string,
 	targetGroupArn *string,
 	startTime time.Time,
 	endTime time.Time,
@@ -90,7 +91,7 @@ func (envars *Envars) AccumulatePeriodicServiceHealth(
 		tgId string
 		err  error
 	)
-	if lbId, err = ExtractAlbId(*envars.LoadBalancerArn); err != nil {
+	if lbId, err = ExtractAlbId(*loadBalancerArn); err != nil {
 		return nil, err
 	}
 	if tgId, err = ExtractTargetGroupId(*targetGroupArn); err != nil {
diff --git a/metrics_test.go b/metrics_test.go
index 4336379..276d63c 100644
--- a/metrics_test.go
+++ b/metrics_test.go
@@ -49,7 +49,6 @@ func TestEnvars_AccumulatePeriodicServiceHealth2(t *testing.T) {
 	defer func() { newTimer = time.NewTimer }()
 	newTimer = fakeTimer
 	envars := &Envars{
-		LoadBalancerArn: aws.String("arn://hoge/app/aaa/bbb"),
 	}
 	ctrl := gomock.NewController(t)
 	cw := mock_cloudwatch.NewMockCloudWatchAPI(ctrl)
@@ -78,7 +77,7 @@ func TestEnvars_AccumulatePeriodicServiceHealth2(t *testing.T) {
 	}).AnyTimes()
 	// cwがdata pointsを返さなくても指定範囲内でリトライする
 	o, err := envars.AccumulatePeriodicServiceHealth(
-		cw, aws.String("hoge/targetgroup/aa/bb"), time.Now(), time.Now(),
+		cw, aws.String("hoge/app/aa/bb"), aws.String("hoge/targetgroup/aa/bb"), time.Now(), time.Now(),
 	)
 	assert.Nil(t, err)
 	assert.Equal(t, 1.0, o.availability)
@@ -86,7 +85,7 @@ func TestEnvars_AccumulatePeriodicServiceHealth2(t *testing.T) {
 }
 
 func TestEnvars_AccumulatePeriodicServiceHealth(t *testing.T) {
-	envars := &Envars{LoadBalancerArn: aws.String("ff/app/aa/bb")}
+	envars := &Envars{}
 	ctrl := gomock.NewController(t)
 	cw := mock_cloudwatch.NewMockCloudWatchAPI(ctrl)
 	cw.EXPECT().GetMetricStatistics(gomock.Any()).Return(&cloudwatch.GetMetricStatisticsOutput{
@@ -101,7 +100,7 @@ func TestEnvars_AccumulatePeriodicServiceHealth(t *testing.T) {
 		return fakeTimer(d)
 	}
 	_, err := envars.AccumulatePeriodicServiceHealth(
-		cw, aws.String("hoge/targetgroup/aa/bb"), time.Now(), time.Now(),
+		cw, aws.String("hoge/app/aa/bb"), aws.String("hoge/targetgroup/aa/bb"), time.Now(), time.Now(),
 	)
 	assert.NotNil(t, err)
 	assert.Equal(t, 20, callCnt)
diff --git a/rollout.go b/rollout.go
index ce12551..da51aca 100644
--- a/rollout.go
+++ b/rollout.go
@@ -76,6 +76,7 @@ func (envars *Envars) StartGradualRollOut(
 
 func (envars *Envars) CanaryTest(
 	cw cloudwatchiface.CloudWatchAPI,
+	loadBalancerArn *string,
 	targetGroupArn *string,
 	totalRollOutCnt int64,
 ) error {
@@ -92,7 +93,7 @@ func (envars *Envars) CanaryTest(
 		"start accumulating periodic service health of '%s' during %s ~ %s",
 		*envars.NextServiceName, startTime.String(), endTime.String(),
 	)
-	health, err := envars.AccumulatePeriodicServiceHealth(cw, targetGroupArn, startTime, endTime)
+	health, err := envars.AccumulatePeriodicServiceHealth(cw, loadBalancerArn, targetGroupArn, startTime, endTime)
 	if err != nil {
 		return err
 	}
@@ -156,7 +157,7 @@ func (envars *Envars) RollOut(
 			return err
 		}
 		// Phase2: service-nextのperiodic healthを計測
-		if err := envars.CanaryTest(ctx.Cw, lb.TargetGroupArn, totalRollOutCnt); err != nil {
+		if err := envars.CanaryTest(ctx.Cw, tg.LoadBalancerArns[0], tg.TargetGroupArn, totalRollOutCnt); err != nil {
 			return err
 		}
 		// Phase3: service-currentからタスクを指定数消す
@@ -193,7 +194,7 @@ func (envars *Envars) RollOut(
 		if oldTaskCount == 0 && newTaskCount >= originalDesiredCount {
 			// ロールアウトが終わったら最終検証を行う
 			log.Infof("estimated roll out completed. Do final canary test...")
-			if err := envars.CanaryTest(ctx.Cw, lb.TargetGroupArn, totalRollOutCnt); err != nil {
+			if err := envars.CanaryTest(ctx.Cw, tg.LoadBalancerArns[0], tg.TargetGroupArn, totalRollOutCnt); err != nil {
 				log.Errorf("final canary test has failed due to: %s", err)
 				return err
 			}
diff --git a/rollout_test.go b/rollout_test.go
index 4ac15bb..92bdf72 100644
--- a/rollout_test.go
+++ b/rollout_test.go
@@ -27,7 +27,6 @@ func DefaultEnvars() *Envars {
 	return &Envars{
 		Region:                   aws.String("us-west-2"),
 		RollOutPeriod:            aws.Int64(0),
-		LoadBalancerArn:          aws.String("hoge/app/1111/hoge"),
 		Cluster:                  aws.String("cage-test"),
 		CurrentServiceName:       aws.String(kCurrentServiceName),
 		NextServiceName:          aws.String(kNextServiceName),
diff --git a/test-integration/integration_test.go b/test-integration/integration_test.go
index 540a338..5cab10d 100644
--- a/test-integration/integration_test.go
+++ b/test-integration/integration_test.go
@@ -11,7 +11,6 @@ import (
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/apex/log"
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
-	"github.com/aws/aws-sdk-go/service/elbv2/elbv2iface"
 	"github.com/aws/aws-sdk-go/service/elbv2"
 	"net/http"
 	"time"
@@ -135,9 +134,16 @@ func setupEnvars() *cage.Envars {
 	return envars
 }
 
-func GetAlbDNS(alb elbv2iface.ELBV2API, arn *string) (*string, error) {
-	out, err := alb.DescribeLoadBalancers(&elbv2.DescribeLoadBalancersInput{
-		LoadBalancerArns: []*string{arn},
+func GetAlbDNS(ctx *cage.Context, envars *cage.Envars) (*string, error) {
+	o, _ := ctx.Ecs.DescribeServices(&ecs.DescribeServicesInput{
+		Cluster:  envars.Cluster,
+		Services: []*string{envars.CurrentServiceName},
+	})
+	o2, _ := ctx.Alb.DescribeTargetGroups(&elbv2.DescribeTargetGroupsInput{
+		TargetGroupArns: []*string{o.Services[0].LoadBalancers[0].TargetGroupArn},
+	})
+	out, err := ctx.Alb.DescribeLoadBalancers(&elbv2.DescribeLoadBalancersInput{
+		LoadBalancerArns: []*string{o2.TargetGroups[0].LoadBalancerArns[0]},
 	})
 	if err != nil {
 		log.Errorf("failed to get alb info due to: %s", err)
@@ -149,11 +155,11 @@ func GetAlbDNS(alb elbv2iface.ELBV2API, arn *string) (*string, error) {
 
 func PollLoadBalancer(
 	envars *cage.Envars,
-	alb elbv2iface.ELBV2API,
+	ctx *cage.Context,
 	interval time.Duration,
 	stop chan bool,
 ) error {
-	dns, err := GetAlbDNS(alb, envars.LoadBalancerArn)
+	dns, err := GetAlbDNS(ctx, envars)
 	if err != nil {
 		log.Errorf(err.Error())
 		return err
@@ -208,7 +214,7 @@ func testInternal(t *testing.T, envars *cage.Envars) (*cage.RollOutResult, error
 		return err
 	})
 	eg.Go(func() error {
-		return PollLoadBalancer(envars, ctx.Alb, time.Duration(10)*time.Second, stop)
+		return PollLoadBalancer(envars, ctx, time.Duration(10)*time.Second, stop)
 	})
 	return result, eg.Wait()
 }
@@ -274,4 +280,4 @@ func TestHealthyToUnHealthy(t *testing.T) {
 	// 新規サービスのタスクがALBヘルスチェック通らない場合ロールバックされること
 	err := testAbnormal(t, kUnhealthyTDArn, "healthy2unhealthy")
 	assert.Nil(t, err)
-}
\ No newline at end of file
+}
diff --git a/test/context.go b/test/context.go
index 02cb57b..daaaba0 100644
--- a/test/context.go
+++ b/test/context.go
@@ -309,8 +309,10 @@ func (ctx *MockContext) DescribeTargetGroups(input *elbv2.DescribeTargetGroupsIn
 		TargetGroups: []*elbv2.TargetGroup{
 			{
 				TargetGroupName:            aws.String("tgname"),
+				TargetGroupArn: input.TargetGroupArns[0],
 				HealthyThresholdCount:      aws.Int64(1),
 				HealthCheckIntervalSeconds: aws.Int64(0),
+				LoadBalancerArns: []*string { aws.String("arn://hoge/app/aa/bb") },
 			},
 		},
 	}, nil