diff --git a/cmd/device-plugin/main.go b/cmd/device-plugin/main.go
index b5d47e6..3dc1f1b 100644
--- a/cmd/device-plugin/main.go
+++ b/cmd/device-plugin/main.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/otiai10/copy"
 	"github.com/run-ai/fake-gpu-operator/internal/common/config"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	"github.com/run-ai/fake-gpu-operator/internal/deviceplugin"
 	"github.com/spf13/viper"
@@ -28,11 +29,11 @@ func main() {
 	kubeClient := KubeClientFn(clusterConfig)
 
 	log.Println("Fake Device Plugin Running")
-	requiredEnvVars := []string{"TOPOLOGY_CM_NAME", "TOPOLOGY_CM_NAMESPACE", "NODE_NAME"}
+	requiredEnvVars := []string{constants.EnvTopologyCmName, constants.EnvTopologyCmNamespace, constants.EnvNodeName}
 	config.ValidateConfig(requiredEnvVars)
 	viper.AutomaticEnv()
 
-	topology, err := topology.GetNodeTopologyFromCM(kubeClient, os.Getenv("NODE_NAME"))
+	topology, err := topology.GetNodeTopologyFromCM(kubeClient, os.Getenv(constants.EnvNodeName))
 	if err != nil {
 		log.Printf("Failed to get topology: %s\n", err)
 		os.Exit(1)
diff --git a/cmd/nvidia-smi/main.go b/cmd/nvidia-smi/main.go
index 51eae00..ca05268 100644
--- a/cmd/nvidia-smi/main.go
+++ b/cmd/nvidia-smi/main.go
@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/jedib0t/go-pretty/v6/table"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 )
 
@@ -25,8 +26,8 @@ type nvidiaSmiArgs struct {
 
 // main is the entry point for the application.
 func main() {
-	os.Setenv("TOPOLOGY_CM_NAMESPACE", "gpu-operator")
-	os.Setenv("TOPOLOGY_CM_NAME", "topology")
+	os.Setenv(constants.EnvTopologyCmNamespace, "gpu-operator")
+	os.Setenv(constants.EnvTopologyCmName, "topology")
 
 	args := getNvidiaSmiArgs()
 
@@ -34,7 +35,7 @@ func main() {
 }
 
 func getNvidiaSmiArgs() (args nvidiaSmiArgs) {
-	nodeName := os.Getenv("NODE_NAME")
+	nodeName := os.Getenv(constants.EnvNodeName)
 
 	// Send http request to topology-server to get the topology
 	resp, err := http.Get("http://topology-server.gpu-operator/topology/nodes/" + nodeName)
diff --git a/cmd/status-updater/main.go b/cmd/status-updater/main.go
index 7a8d4f8..c2a6862 100644
--- a/cmd/status-updater/main.go
+++ b/cmd/status-updater/main.go
@@ -3,11 +3,12 @@ package main
 import (
 	"github.com/run-ai/fake-gpu-operator/internal/common/app"
 	"github.com/run-ai/fake-gpu-operator/internal/common/config"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	status_updater "github.com/run-ai/fake-gpu-operator/internal/status-updater"
 )
 
 func main() {
-	requiredEnvVars := []string{"TOPOLOGY_CM_NAME", "TOPOLOGY_CM_NAMESPACE", "FAKE_GPU_OPERATOR_NAMESPACE"}
+	requiredEnvVars := []string{constants.EnvTopologyCmName, constants.EnvTopologyCmNamespace, constants.EnvFakeGpuOperatorNs}
 	config.ValidateConfig(requiredEnvVars)
 
 	appRunner := app.NewAppRunner(&status_updater.StatusUpdaterApp{})
diff --git a/internal/common/app/apprunner.go b/internal/common/app/apprunner.go
index 022d92f..26fb703 100644
--- a/internal/common/app/apprunner.go
+++ b/internal/common/app/apprunner.go
@@ -9,6 +9,7 @@ import (
 
 	"github.com/go-playground/validator"
 	"github.com/mitchellh/mapstructure"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/spf13/viper"
 )
 
@@ -95,6 +96,6 @@ func bindStruct(input interface{}) error {
 }
 
 func setDefaults() {
-	viper.SetDefault("TOPOLOGY_CM_NAME", "topology")
-	viper.SetDefault("TOPOLOGY_CM_NAMESPACE", "gpu-operator")
+	viper.SetDefault(constants.EnvTopologyCmName, "topology")
+	viper.SetDefault(constants.EnvTopologyCmNamespace, "gpu-operator")
 }
diff --git a/internal/common/kubeclient/kubeclient.go b/internal/common/kubeclient/kubeclient.go
index 49b05b6..4ebbb11 100644
--- a/internal/common/kubeclient/kubeclient.go
+++ b/internal/common/kubeclient/kubeclient.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"log"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/spf13/viper"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -44,7 +45,7 @@ func NewKubeClient(config *rest.Config, stop chan struct{}) *KubeClient {
 }
 
 func (client *KubeClient) SetNodeLabels(lables map[string]string) error {
-	nodeName := viper.GetString("NODE_NAME")
+	nodeName := viper.GetString(constants.EnvNodeName)
 	node, err := client.ClientSet.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
 	if err != nil {
 		return err
@@ -60,7 +61,7 @@ func (client *KubeClient) SetNodeLabels(lables map[string]string) error {
 }
 
 func (client *KubeClient) SetNodeAnnotations(annotations map[string]string) error {
-	nodeName := viper.GetString("NODE_NAME")
+	nodeName := viper.GetString(constants.EnvNodeName)
 	node, err := client.ClientSet.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
 	if err != nil {
 		return err
@@ -76,7 +77,7 @@ func (client *KubeClient) SetNodeAnnotations(annotations map[string]string) erro
 }
 
 func (client *KubeClient) GetNodeLabels() (map[string]string, error) {
-	nodeName := viper.GetString("NODE_NAME")
+	nodeName := viper.GetString(constants.EnvNodeName)
 	node, err := client.ClientSet.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
 	if err != nil {
 		return nil, err
diff --git a/internal/common/topology/kubernetes.go b/internal/common/topology/kubernetes.go
index 95c8e8b..e2de164 100644
--- a/internal/common/topology/kubernetes.go
+++ b/internal/common/topology/kubernetes.go
@@ -6,6 +6,7 @@ import (
 
 	"gopkg.in/yaml.v3"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/spf13/viper"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -15,7 +16,7 @@ import (
 func GetNodeTopologyFromCM(kubeclient kubernetes.Interface, nodeName string) (*NodeTopology, error) {
 	cmName := GetNodeTopologyCMName(nodeName)
 	cm, err := kubeclient.CoreV1().ConfigMaps(
-		viper.GetString("TOPOLOGY_CM_NAMESPACE")).Get(
+		viper.GetString(constants.EnvTopologyCmNamespace)).Get(
 		context.TODO(), cmName, metav1.GetOptions{})
 	if err != nil {
 		return nil, err
@@ -31,7 +32,7 @@ func CreateNodeTopologyCM(kubeclient kubernetes.Interface, nodeTopology *NodeTop
 	}
 
 	_, err = kubeclient.CoreV1().ConfigMaps(
-		viper.GetString("TOPOLOGY_CM_NAMESPACE")).Create(context.TODO(), cm, metav1.CreateOptions{})
+		viper.GetString(constants.EnvTopologyCmNamespace)).Create(context.TODO(), cm, metav1.CreateOptions{})
 	return err
 }
 
@@ -42,21 +43,21 @@ func UpdateNodeTopologyCM(kubeclient kubernetes.Interface, nodeTopology *NodeTop
 	}
 
 	_, err = kubeclient.CoreV1().ConfigMaps(
-		viper.GetString("TOPOLOGY_CM_NAMESPACE")).Update(context.TODO(), cm, metav1.UpdateOptions{})
+		viper.GetString(constants.EnvTopologyCmNamespace)).Update(context.TODO(), cm, metav1.UpdateOptions{})
 	return err
 }
 
 func DeleteNodeTopologyCM(kubeclient kubernetes.Interface, nodeName string) error {
 
 	err := kubeclient.CoreV1().ConfigMaps(
-		viper.GetString("TOPOLOGY_CM_NAMESPACE")).Delete(context.TODO(), GetNodeTopologyCMName(nodeName), metav1.DeleteOptions{})
+		viper.GetString(constants.EnvTopologyCmNamespace)).Delete(context.TODO(), GetNodeTopologyCMName(nodeName), metav1.DeleteOptions{})
 	return err
 }
 
 func GetBaseTopologyFromCM(kubeclient kubernetes.Interface) (*BaseTopology, error) {
 	topologyCm, err := kubeclient.CoreV1().ConfigMaps(
-		viper.GetString("TOPOLOGY_CM_NAMESPACE")).Get(
-		context.TODO(), viper.GetString("TOPOLOGY_CM_NAME"), metav1.GetOptions{})
+		viper.GetString(constants.EnvTopologyCmNamespace)).Get(
+		context.TODO(), viper.GetString(constants.EnvTopologyCmName), metav1.GetOptions{})
 	if err != nil {
 		return nil, fmt.Errorf("failed to get topology configmap: %v", err)
 	}
@@ -92,8 +93,8 @@ func FromNodeTopologyCM(cm *corev1.ConfigMap) (*NodeTopology, error) {
 func ToBaseTopologyCM(baseTopology *BaseTopology) (*corev1.ConfigMap, error) {
 	cm := &corev1.ConfigMap{
 		ObjectMeta: metav1.ObjectMeta{
-			Name:      viper.GetString("TOPOLOGY_CM_NAME"),
-			Namespace: viper.GetString("TOPOLOGY_CM_NAMESPACE"),
+			Name:      viper.GetString(constants.EnvTopologyCmName),
+			Namespace: viper.GetString(constants.EnvTopologyCmNamespace),
 		},
 		Data: make(map[string]string),
 	}
@@ -112,7 +113,7 @@ func ToNodeTopologyCM(nodeTopology *NodeTopology, nodeName string) (*corev1.Conf
 	cm := &corev1.ConfigMap{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      GetNodeTopologyCMName(nodeName),
-			Namespace: viper.GetString("TOPOLOGY_CM_NAMESPACE"),
+			Namespace: viper.GetString(constants.EnvTopologyCmNamespace),
 			Labels: map[string]string{
 				"node-topology": "true",
 			},
@@ -131,5 +132,5 @@ func ToNodeTopologyCM(nodeTopology *NodeTopology, nodeName string) (*corev1.Conf
 }
 
 func GetNodeTopologyCMName(nodeName string) string {
-	return viper.GetString("TOPOLOGY_CM_NAME") + "-" + nodeName
+	return viper.GetString(constants.EnvTopologyCmName) + "-" + nodeName
 }
diff --git a/internal/migfaker/syncconfig.go b/internal/migfaker/syncconfig.go
index 852a2f6..d4ab0b9 100644
--- a/internal/migfaker/syncconfig.go
+++ b/internal/migfaker/syncconfig.go
@@ -3,6 +3,7 @@ package migfaker
 import (
 	"sync"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/spf13/viper"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/fields"
@@ -51,7 +52,7 @@ func ContinuouslySyncMigConfigChanges(clientset kubernetes.Interface, migConfig
 		clientset.CoreV1().RESTClient(),
 		ResourceNodes,
 		v1.NamespaceAll,
-		fields.OneTermEqualSelector("metadata.name", viper.GetString("NODE_NAME")),
+		fields.OneTermEqualSelector("metadata.name", viper.GetString(constants.EnvNodeName)),
 	)
 
 	_, controller := cache.NewInformer(
diff --git a/internal/status-exporter/app.go b/internal/status-exporter/app.go
index cdfe5fb..ab073d2 100644
--- a/internal/status-exporter/app.go
+++ b/internal/status-exporter/app.go
@@ -13,7 +13,7 @@ import (
 
 type StatusExporterAppConfig struct {
 	NodeName                  string `mapstructure:"NODE_NAME" validator:"required"`
-	TopologyCmName            string `mapstructure:"TOPOLOGY_CM_NAME" validator:"required"`
+	TopologyCmName            string `mapstructure:constants.EnvTopologyCmName validator:"required"`
 	TopologyCmNamespace       string `mapstructure:"TOPOLOGY_CM_NAMESPACE" validator:"required"`
 	TopologyMaxExportInterval string `mapstructure:"TOPOLOGY_MAX_EXPORT_INTERVAL"`
 }
diff --git a/internal/status-exporter/app_test.go b/internal/status-exporter/app_test.go
index b6de76a..7c5039f 100644
--- a/internal/status-exporter/app_test.go
+++ b/internal/status-exporter/app_test.go
@@ -18,6 +18,7 @@ import (
 	"k8s.io/client-go/kubernetes/fake"
 
 	"github.com/run-ai/fake-gpu-operator/internal/common/app"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/kubeclient"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	status_exporter "github.com/run-ai/fake-gpu-operator/internal/status-exporter"
@@ -102,9 +103,9 @@ func setupConfig() {
 }
 
 func setupEnvs() {
-	os.Setenv("TOPOLOGY_CM_NAME", topologyCmName)
-	os.Setenv("TOPOLOGY_CM_NAMESPACE", topologyCmNamespace)
-	os.Setenv("NODE_NAME", nodeName)
+	os.Setenv(constants.EnvTopologyCmName, topologyCmName)
+	os.Setenv(constants.EnvTopologyCmNamespace, topologyCmNamespace)
+	os.Setenv(constants.EnvNodeName, nodeName)
 	os.Setenv("KUBERNETES_SERVICE_HOST", "fake-k8s-service-host")
 	os.Setenv("KUBERNETES_SERVICE_PORT", "fake-k8s-service-port")
 }
diff --git a/internal/status-exporter/export/labels/exporter_test.go b/internal/status-exporter/export/labels/exporter_test.go
index 605b7be..d988954 100644
--- a/internal/status-exporter/export/labels/exporter_test.go
+++ b/internal/status-exporter/export/labels/exporter_test.go
@@ -5,6 +5,7 @@ import (
 	"sync"
 	"testing"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/kubeclient"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	"github.com/run-ai/fake-gpu-operator/internal/status-exporter/export/labels"
@@ -22,7 +23,7 @@ func (watcher *FakeWatcher) Subscribe(subscriber chan<- *topology.NodeTopology)
 func (watcher *FakeWatcher) Watch(stopCh <-chan struct{}) {}
 
 func TestExport(t *testing.T) {
-	viper.SetDefault("NODE_NAME", "my_node")
+	viper.SetDefault(constants.EnvNodeName, "my_node")
 
 	myNode := &topology.NodeTopology{
 		GpuProduct: "some gpu",
diff --git a/internal/status-exporter/export/metrics/exporter.go b/internal/status-exporter/export/metrics/exporter.go
index 3a3fc32..a6328e3 100644
--- a/internal/status-exporter/export/metrics/exporter.go
+++ b/internal/status-exporter/export/metrics/exporter.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	"github.com/run-ai/fake-gpu-operator/internal/status-exporter/export"
 	"github.com/run-ai/fake-gpu-operator/internal/status-exporter/watch"
@@ -61,7 +62,7 @@ func (e *MetricsExporter) Run(stopCh <-chan struct{}) {
 }
 
 func (e *MetricsExporter) export(nodeTopology *topology.NodeTopology) error {
-	nodeName := viper.GetString("NODE_NAME")
+	nodeName := viper.GetString(constants.EnvNodeName)
 
 	gpuUtilization.Reset()
 	gpuFbUsed.Reset()
diff --git a/internal/status-exporter/watch/kubewatcher.go b/internal/status-exporter/watch/kubewatcher.go
index 80b04e9..ac53cf1 100644
--- a/internal/status-exporter/watch/kubewatcher.go
+++ b/internal/status-exporter/watch/kubewatcher.go
@@ -4,6 +4,7 @@ import (
 	"log"
 	"time"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/kubeclient"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	"github.com/spf13/viper"
@@ -28,7 +29,7 @@ func (w *KubeWatcher) Subscribe(subscriber chan<- *topology.NodeTopology) {
 }
 
 func (w *KubeWatcher) Watch(stopCh <-chan struct{}) {
-	cmChan, err := w.kubeclient.WatchConfigMap(viper.GetString("TOPOLOGY_CM_NAMESPACE"), topology.GetNodeTopologyCMName(viper.GetString("NODE_NAME")))
+	cmChan, err := w.kubeclient.WatchConfigMap(viper.GetString(constants.EnvTopologyCmNamespace), topology.GetNodeTopologyCMName(viper.GetString(constants.EnvNodeName)))
 	if err != nil {
 		panic(err)
 	}
@@ -50,7 +51,7 @@ func (w *KubeWatcher) Watch(stopCh <-chan struct{}) {
 
 		case <-ticker.C:
 			log.Printf("Topology update not received within interval, publishing...\n")
-			cm, ok := w.kubeclient.GetConfigMap(viper.GetString("TOPOLOGY_CM_NAMESPACE"), topology.GetNodeTopologyCMName(viper.GetString("NODE_NAME")))
+			cm, ok := w.kubeclient.GetConfigMap(viper.GetString(constants.EnvTopologyCmNamespace), topology.GetNodeTopologyCMName(viper.GetString(constants.EnvNodeName)))
 			if !ok {
 				break
 			}
diff --git a/internal/status-updater/app_test.go b/internal/status-updater/app_test.go
index 195774e..b774579 100644
--- a/internal/status-updater/app_test.go
+++ b/internal/status-updater/app_test.go
@@ -501,8 +501,8 @@ func setupConfig() {
 }
 
 func setupEnvs() {
-	os.Setenv("TOPOLOGY_CM_NAME", "fake-cm-name")
-	os.Setenv("TOPOLOGY_CM_NAMESPACE", "fake-cm-namespace")
+	os.Setenv(constants.EnvTopologyCmName, "fake-cm-name")
+	os.Setenv(constants.EnvTopologyCmNamespace, "fake-cm-namespace")
 }
 
 func createTopology(gpuCount int64, nodeName string) *topology.NodeTopology {
diff --git a/internal/status-updater/controllers/node/controller.go b/internal/status-updater/controllers/node/controller.go
index b2bf7cd..38289fb 100644
--- a/internal/status-updater/controllers/node/controller.go
+++ b/internal/status-updater/controllers/node/controller.go
@@ -6,6 +6,7 @@ import (
 	"log"
 	"sync"
 
+	"github.com/run-ai/fake-gpu-operator/internal/common/constants"
 	"github.com/run-ai/fake-gpu-operator/internal/common/topology"
 	"github.com/run-ai/fake-gpu-operator/internal/status-updater/controllers"
 	"github.com/run-ai/fake-gpu-operator/internal/status-updater/controllers/util"
@@ -82,7 +83,7 @@ func (c *NodeController) pruneTopologyNodes() error {
 		return fmt.Errorf("failed listing fake gpu nodes: %v", err)
 	}
 
-	nodeTopologyCms, err := c.kubeClient.CoreV1().ConfigMaps(viper.GetString("TOPOLOGY_CM_NAMESPACE")).List(context.TODO(), metav1.ListOptions{
+	nodeTopologyCms, err := c.kubeClient.CoreV1().ConfigMaps(viper.GetString(constants.EnvTopologyCmNamespace)).List(context.TODO(), metav1.ListOptions{
 		LabelSelector: "node-topology=true",
 	})
 	if err != nil {
@@ -96,7 +97,7 @@ func (c *NodeController) pruneTopologyNodes() error {
 
 	for _, cm := range nodeTopologyCms.Items {
 		if _, ok := validNodeTopologyCMMap[cm.Name]; !ok {
-			util.LogErrorIfExist(c.kubeClient.CoreV1().ConfigMaps(viper.GetString("TOPOLOGY_CM_NAMESPACE")).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{}), fmt.Sprintf("Failed to delete node topology cm %s", cm.Name))
+			util.LogErrorIfExist(c.kubeClient.CoreV1().ConfigMaps(viper.GetString(constants.EnvTopologyCmNamespace)).Delete(context.TODO(), cm.Name, metav1.DeleteOptions{}), fmt.Sprintf("Failed to delete node topology cm %s", cm.Name))
 		}
 	}