Set min nodes to 0 for worker and user.

src/_nebari/provider/cloud/amazon_web_services.py

@@ -143,6 +143,46 @@ def aws_get_vpc_id(name: str, namespace: str, region: str) -> Optional[str]:
     return None
 
 
+def set_asg_tags(asg_node_group_map: Dict[str, str], region: str) -> None:
+    """Set tags for AWS node scaling from zero to work."""
+    session = aws_session(region=region)
+    autoscaling_client = session.client("autoscaling")
+    tags = []
+    for asg_name, node_group in asg_node_group_map.items():
+        tags.append(
+            {
+                "Key": "k8s.io/cluster-autoscaler/node-template/label/dedicated",
+                "Value": node_group,
+                "ResourceId": asg_name,
+                "ResourceType": "auto-scaling-group",
+                "PropagateAtLaunch": True,
+            }
+        )
+    autoscaling_client.create_or_update_tags(Tags=tags)
+
+
+def aws_get_asg_node_group_mapping(
+    name: str, namespace: str, region: str
+) -> Dict[str, str]:
+    """Return a dictionary of autoscaling groups and their associated node groups."""
+    asg_node_group_mapping = {}
+    session = aws_session(region=region)
+    eks = session.client("eks")
+    node_groups_response = eks.list_nodegroups(
+        clusterName=f"{name}-{namespace}",
+    )
+    node_groups = node_groups_response.get("nodegroups", [])
+    for nodegroup in node_groups:
+        response = eks.describe_nodegroup(
+            clusterName=f"{name}-{namespace}", nodegroupName=nodegroup
+        )
+        node_group_name = response["nodegroup"]["nodegroupName"]
+        auto_scaling_groups = response["nodegroup"]["resources"]["autoScalingGroups"]
+        for auto_scaling_group in auto_scaling_groups:
+            asg_node_group_mapping[auto_scaling_group["name"]] = node_group_name
+    return asg_node_group_mapping
+
+
 def aws_get_subnet_ids(name: str, namespace: str, region: str) -> List[str]:
     """Return list of subnet IDs for the EKS cluster named `{name}-{namespace}`."""
     session = aws_session(region=region)

src/_nebari/stages/infrastructure/__init__.py

@@ -145,6 +145,17 @@ class AWSInputVars(schema.Base):
     tags: Dict[str, str] = {}
 
 
+def _calculate_asg_node_group_map(config: schema.Main):
+    if config.provider == schema.ProviderEnum.aws:
+        return amazon_web_services.aws_get_asg_node_group_mapping(
+            config.project_name,
+            config.namespace,
+            config.amazon_web_services.region,
+        )
+    else:
+        return {}
+
+
 def _calculate_node_groups(config: schema.Main):
     if config.provider == schema.ProviderEnum.aws:
         return {
@@ -438,10 +449,10 @@ class AmazonWebServicesProvider(schema.Base):
     node_groups: Dict[str, AWSNodeGroup] = {
         "general": AWSNodeGroup(instance="m5.2xlarge", min_nodes=1, max_nodes=1),
         "user": AWSNodeGroup(
-            instance="m5.xlarge", min_nodes=1, max_nodes=5, single_subnet=False
+            instance="m5.xlarge", min_nodes=0, max_nodes=5, single_subnet=False
         ),
         "worker": AWSNodeGroup(
-            instance="m5.xlarge", min_nodes=1, max_nodes=5, single_subnet=False
+            instance="m5.xlarge", min_nodes=0, max_nodes=5, single_subnet=False
         ),
     }
     existing_subnet_ids: List[str] = None
@@ -814,6 +825,16 @@ def set_outputs(
         outputs["node_selectors"] = _calculate_node_groups(self.config)
         super().set_outputs(stage_outputs, outputs)
 
+    @contextlib.contextmanager
+    def post_deploy(
+        self, stage_outputs: Dict[str, Dict[str, Any]], disable_prompt: bool = False
+    ):
+        asg_node_group_map = _calculate_asg_node_group_map(self.config)
+        if asg_node_group_map:
+            amazon_web_services.set_asg_tags(
+                asg_node_group_map, self.config.amazon_web_services.region
+            )
+
     @contextlib.contextmanager
     def deploy(
         self, stage_outputs: Dict[str, Dict[str, Any]], disable_prompt: bool = False

src/_nebari/stages/infrastructure/template/aws/modules/kubernetes/main.tf

@@ -39,6 +39,10 @@ resource "aws_eks_node_group" "main" {
     max_size     = var.node_groups[count.index].max_size
   }
 
+  labels = {
+    "dedicated" = var.node_groups[count.index].name
+  }
+
   lifecycle {
     ignore_changes = [
       scaling_config[0].desired_size,
@@ -53,7 +57,9 @@ resource "aws_eks_node_group" "main" {
   ]
 
   tags = merge({
-    "kubernetes.io/cluster/${var.name}" = "shared"
+    #    "kubernetes.io/cluster/${var.name}"                       = "shared"
+    "k8s.io/cluster-autoscaler/node-template/label/dedicated" = var.node_groups[count.index].name
+    propagate_at_launch                                       = true
   }, var.tags)
 }
 

src/_nebari/stages/kubernetes_services/__init__.py

@@ -362,6 +362,7 @@ class JupyterhubInputVars(schema.Base):
     idle_culler_settings: Dict[str, Any] = Field(alias="idle-culler-settings")
     argo_workflows_enabled: bool = Field(alias="argo-workflows-enabled")
     jhub_apps_enabled: bool = Field(alias="jhub-apps-enabled")
+    cloud_provider: str = Field(alias="cloud-provider")
 
 
 class DaskGatewayInputVars(schema.Base):
@@ -411,6 +412,7 @@ def input_vars(self, stage_outputs: Dict[str, Dict[str, Any]]):
         realm_id = stage_outputs["stages/06-kubernetes-keycloak-configuration"][
             "realm_id"
         ]["value"]
+        cloud_provider = self.config.provider.value
         jupyterhub_shared_endpoint = (
             stage_outputs["stages/02-infrastructure"]
             .get("nfs_endpoint", {})
@@ -486,6 +488,7 @@ def input_vars(self, stage_outputs: Dict[str, Dict[str, Any]]):
             ),
             jupyterhub_stared_storage=self.config.storage.shared_filesystem,
             jupyterhub_shared_endpoint=jupyterhub_shared_endpoint,
+            cloud_provider=cloud_provider,
             jupyterhub_profiles=self.config.profiles.dict()["jupyterlab"],
             jupyterhub_image=_split_docker_image_name(
                 self.config.default_images.jupyterhub

src/_nebari/stages/kubernetes_services/template/jupyterhub.tf

@@ -55,6 +55,10 @@ variable "idle-culler-settings" {
   type        = any
 }
 
+variable "cloud-provider" {
+  description = "Name of cloud provider."
+  type        = string
+}
 
 module "kubernetes-nfs-server" {
   count = var.jupyterhub-shared-endpoint == null ? 1 : 0
@@ -88,6 +92,8 @@ module "jupyterhub" {
   name      = var.name
   namespace = var.environment
 
+  cloud-provider = var.cloud-provider
+
   external-url = var.endpoint
   realm_id     = var.realm_id
 

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/dask-gateway/files/gateway_config.py

@@ -114,8 +114,12 @@ def list_dask_environments():
 
 
 def base_node_group(options):
+    key = config["worker-node-group"]["key"]
+    if config.provider.value == "aws":
+        key = "dedicated"
     default_node_group = {
-        config["worker-node-group"]["key"]: config["worker-node-group"]["value"]
+        key: config["worker-node-group"]["value"],
+        # config["worker-node-group"]["key"]: config["worker-node-group"]["value"],
     }
 
     # check `worker_extra_pod_config` first

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/main.tf

@@ -16,8 +16,11 @@ resource "random_password" "jhub_apps_jwt_secret" {
 }
 
 locals {
-  jhub_apps_secrets_name = "jhub-apps-secrets"
-  jhub_apps_env_var_name = "JHUB_APP_JWT_SECRET_KEY"
+  jhub_apps_secrets_name           = "jhub-apps-secrets"
+  jhub_apps_env_var_name           = "JHUB_APP_JWT_SECRET_KEY"
+  singleuser_nodeselector_key      = var.cloud-provider == "aws" ? "dedicated" : var.user-node-group.key
+  userscheduler_nodeselector_key   = var.cloud-provider == "aws" ? "dedicated" : var.user-node-group.key
+  userscheduler_nodeselector_value = var.cloud-provider == "aws" ? var.general-node-group.value : var.user-node-group.value
 }
 
 resource "kubernetes_secret" "jhub_apps_secrets" {
@@ -174,14 +177,14 @@ resource "helm_release" "jupyterhub" {
       singleuser = {
         image = var.jupyterlab-image
         nodeSelector = {
-          "${var.user-node-group.key}" = var.user-node-group.value
+          "${local.singleuser_nodeselector_key}" = var.user-node-group.value
         }
       }
 
       scheduling = {
         userScheduler = {
           nodeSelector = {
-            "${var.user-node-group.key}" = var.user-node-group.value
+            "${local.userscheduler_nodeselector_key}" = local.userscheduler_nodeselector_value
           }
         }
       }

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/variables.tf

@@ -168,6 +168,11 @@ variable "jupyterlab-pioneer-log-format" {
   type        = string
 }
 
+variable "cloud-provider" {
+  description = "Name of cloud provider."
+  type        = string
+}
+
 variable "initial-repositories" {
   description = "Map of folder location and git repo url to clone"
   type        = string