diff --git a/models/kube/backend/job_backend.k b/models/kube/backend/job_backend.k
index 313d50b..d724644 100644
--- a/models/kube/backend/job_backend.k
+++ b/models/kube/backend/job_backend.k
@@ -32,7 +32,7 @@ schema JobBackend[inputConfig: frontend.Job]:
         mainContainerDict = {
             **config.mainContainer
             if config.mainContainer.useBuiltInEnv:
-                env += app.envs
+                env = config.mainContainer.env | app.envs
             name = config.mainContainer.name or "main"
             image = config.image
             resource = config?.schedulingStrategy?.resource
diff --git a/models/kube/backend/server_backend.k b/models/kube/backend/server_backend.k
index 0e88988..196cf7e 100644
--- a/models/kube/backend/server_backend.k
+++ b/models/kube/backend/server_backend.k
@@ -41,7 +41,7 @@ schema ServerBackend[inputConfig: server.Server]:
         mainContainer = utils.volume_patch(config.volumes, [utils.ContainerFrontend2Kube({
             **config.mainContainer
             if config.mainContainer.useBuiltInEnv:
-                env += app.envs
+                env = config.mainContainer.env | app.envs
             name = config.mainContainer.name or "main"
             image = config.image
             resource = config?.schedulingStrategy?.resource
diff --git a/models/kube/metadata/metadata.k b/models/kube/metadata/metadata.k
index c15bbeb..3227187 100644
--- a/models/kube/metadata/metadata.k
+++ b/models/kube/metadata/metadata.k
@@ -1,4 +1,4 @@
-__META_APP_NAME = option("app") or "sampleapp"
-__META_APP_NAMESPACE = option("appns") or "sampleappns"
-__META_ENV_TYPE_NAME = option("env") or "prod"
-__META_CLUSTER_NAME = option("cluster") or Undefined
+__META_APP_NAME = option("app") or option("params")?.app or "sampleapp"
+__META_APP_NAMESPACE = option("appns") or option("params")?.appns or "sampleappns"
+__META_ENV_TYPE_NAME = option("appenv") or option("params")?.appenv or "prod"
+__META_CLUSTER_NAME = option("appcluster") or option("params")?.appcluster or Undefined
diff --git a/models/kube/utils/application_builder.k b/models/kube/utils/application_builder.k
index e74d838..3723355 100644
--- a/models/kube/utils/application_builder.k
+++ b/models/kube/utils/application_builder.k
@@ -1,4 +1,5 @@
 import models.kube.metadata
+import models.kube.frontend.container.env as e
 
 schema ApplicationBuilder:
     """ApplicationBuilder contains the workload labels, selector and environments about the application
@@ -9,26 +10,24 @@ schema ApplicationBuilder:
         "app.kubernetes.io/name": metadata.__META_APP_NAME
         "app.kubernetes.io/env": metadata.__META_ENV_TYPE_NAME
         "app.kubernetes.io/instance": "{}-{}".format(metadata.__META_APP_NAME, metadata.__META_ENV_TYPE_NAME).lower()
-        "cluster.x-k8s.io/cluster-name": metadata.__META_CLUSTER_NAME
+        if metadata.__META_CLUSTER_NAME:
+            "cluster.x-k8s.io/cluster-name": metadata.__META_CLUSTER_NAME
     }
 
     selector: {str:str} = labels
 
-    envs: [{str:}] = [
-        {
-            name: "APP_NAME"
+    envs: e.EnvMap = {
+        APP_NAME: {
             value: metadata.__META_APP_NAME
         }
-        {
-            name: "ENVIRONMENT"
+        ENVIRONMENT: {
             value: metadata.__META_ENV_TYPE_NAME
         }
-        {
-            name: "INSTANCE"
+        INSTANCE: {
             value: "{}-{}".format(metadata.__META_APP_NAME, metadata.__META_ENV_TYPE_NAME).lower()
         }
-        {
-            name: "CLUSTER"
-            value: metadata.__META_CLUSTER_NAME
-        }
-    ]
+        if metadata.__META_CLUSTER_NAME:
+            CLUSTER: {
+                value: metadata.__META_CLUSTER_NAME
+            }
+    }