MSP-3875: add maintenance mode

api/v1/slurmcluster_types.go

@@ -5,6 +5,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/api/resource"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"nebius.ai/slurm-operator/internal/consts"
 
 	mariadbv1alpha1 "github.com/mariadb-operator/mariadb-operator/api/v1alpha1"
 	prometheusv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"
@@ -22,12 +23,17 @@ type SlurmClusterSpec struct {
 	// +kubebuilder:validation:Optional
 	// +kubebuilder:default="gpu"
 	ClusterType string `json:"clusterType,omitempty"`
-
-	// Pause defines whether to gracefully stop the cluster.
-	// Setting it to false after cluster has been paused starts the cluster back
+	// Maintenance defines the maintenance window for the cluster.
+	// It can have the following values:
+	// - none: No maintenance is performed. The cluster operates normally.
+	// - downscale: Scales down all components to 0.
+	// - downscaleAndDeletePopulateJail: Scales down all components to 0 and deletes the kubernetes Kind Jobs populateJail.
+	// - skipPopulateJail: Skips the execution of the populateJail job during maintenance.
 	//
 	// +kubebuilder:validation:Optional
-	Pause bool `json:"pause,omitempty"` // TODO cluster pausing/resuming
+	// +kubebuilder:validation:Enum=none;downscale;downscaleAndDeletePopulateJail;skipPopulateJail
+	// +kubebuilder:default="none"
+	Maintenance *consts.MaintenanceMode `json:"maintenance,omitempty"`
 
 	// NCCLSettings
 	// +kubebuilder:validation:Optional

config/crd/bases/slurm.nebius.ai_slurmclusters.yaml

@@ -1065,6 +1065,21 @@ spec:
                   type: object
                 minItems: 1
                 type: array
+              maintenance:
+                default: none
+                description: |-
+                  Maintenance defines the maintenance window for the cluster.
+                  It can have the following values:
+                  - none: No maintenance is performed. The cluster operates normally.
+                  - downscale: Scales down all components to 0.
+                  - downscaleAndDeletePopulateJail: Scales down all components to 0 and deletes the kubernetes Kind Jobs populateJail.
+                  - skipPopulateJail: Skips the execution of the populateJail job during maintenance.
+                enum:
+                - none
+                - downscale
+                - downscaleAndDeletePopulateJail
+                - skipPopulateJail
+                type: string
               ncclSettings:
                 description: NCCLSettings
                 properties:
@@ -1101,11 +1116,6 @@ spec:
                       type: string
                     type: array
                 type: object
-              pause:
-                description: |-
-                  Pause defines whether to gracefully stop the cluster.
-                  Setting it to false after cluster has been paused starts the cluster back
-                type: boolean
               periodicChecks:
                 description: PeriodicChecks define the k8s CronJobs performing cluster
                   checks

helm/slurm-cluster/templates/slurm-cluster-cr.yaml

@@ -17,6 +17,7 @@ spec:
   slurmConfig:
     {{- toYaml .Values.slurmConfig | nindent 4 }}
   {{- end }}
+  maintenance: {{ default "none" .Values.maintenance | quote  }}
   crVersion: {{ .Chart.Version }}
   useDefaultAppArmorProfile: {{ .Values.useDefaultAppArmorProfile }}
   pause: {{ .Values.pause }}

helm/slurm-cluster/values.yaml

@@ -3,8 +3,13 @@ clusterName: "slurm1"
 annotations: {}
 # Add appArmor profile to the cluster
 useDefaultAppArmorProfile: true
-# Whether to gracefully stop the cluster. Setting it to false after cluster has been paused starts the cluster back
-pause: false
+# Maintenance defines the maintenance window for the cluster.
+# It can have the following values:
+# - none: No maintenance is performed. The cluster operates normally.
+# - downscale: Scales down all components to 0.
+# - downscaleAndDeletePopulateJail: Scales down all components to 0 and deletes the kubernetes Kind Jobs populateJail.
+# - skipPopulateJail: Skips the execution of the populateJail job during maintenance.
+maintenance: "none"
 # Slurm cluster type. Can be now gpu or cpu
 clusterType: gpu
 # partitionConfiguration define partition configuration of slurm worker nodes

helm/soperator-crds/templates/slurmcluster-crd.yaml

@@ -1064,6 +1064,21 @@ spec:
                   type: object
                 minItems: 1
                 type: array
+              maintenance:
+                default: none
+                description: |-
+                  Maintenance defines the maintenance window for the cluster.
+                  It can have the following values:
+                  - none: No maintenance is performed. The cluster operates normally.
+                  - downscale: Scales down all components to 0.
+                  - downscaleAndDeletePopulateJail: Scales down all components to 0 and deletes the kubernetes Kind Jobs populateJail.
+                  - skipPopulateJail: Skips the execution of the populateJail job during maintenance.
+                enum:
+                - none
+                - downscale
+                - downscaleAndDeletePopulateJail
+                - skipPopulateJail
+                type: string
               ncclSettings:
                 description: NCCLSettings
                 properties:
@@ -1100,11 +1115,6 @@ spec:
                       type: string
                     type: array
                 type: object
-              pause:
-                description: |-
-                  Pause defines whether to gracefully stop the cluster.
-                  Setting it to false after cluster has been paused starts the cluster back
-                type: boolean
               periodicChecks:
                 description: PeriodicChecks define the k8s CronJobs performing cluster
                   checks

helm/soperator/crds/slurmcluster-crd.yaml

@@ -1064,6 +1064,21 @@ spec:
                   type: object
                 minItems: 1
                 type: array
+              maintenance:
+                default: none
+                description: |-
+                  Maintenance defines the maintenance window for the cluster.
+                  It can have the following values:
+                  - none: No maintenance is performed. The cluster operates normally.
+                  - downscale: Scales down all components to 0.
+                  - downscaleAndDeletePopulateJail: Scales down all components to 0 and deletes the kubernetes Kind Jobs populateJail.
+                  - skipPopulateJail: Skips the execution of the populateJail job during maintenance.
+                enum:
+                - none
+                - downscale
+                - downscaleAndDeletePopulateJail
+                - skipPopulateJail
+                type: string
               ncclSettings:
                 description: NCCLSettings
                 properties:
@@ -1100,11 +1115,6 @@ spec:
                       type: string
                     type: array
                 type: object
-              pause:
-                description: |-
-                  Pause defines whether to gracefully stop the cluster.
-                  Setting it to false after cluster has been paused starts the cluster back
-                type: boolean
               periodicChecks:
                 description: PeriodicChecks define the k8s CronJobs performing cluster
                   checks

internal/check/maintanence.go

@@ -0,0 +1,15 @@
+package check
+
+import "nebius.ai/slurm-operator/internal/consts"
+
+func IsMaintenanceActive(maintenance *consts.MaintenanceMode) bool {
+	return maintenance != nil && *maintenance != consts.ModeNone
+}
+
+func IsModeDownscaleAndDeletePopulate(maintenance *consts.MaintenanceMode) bool {
+	return maintenance != nil && *maintenance == consts.ModeDownscaleAndDeletePopulate
+}
+
+func IsModeSkipPopulateJail(maintenance *consts.MaintenanceMode) bool {
+	return maintenance != nil && *maintenance == consts.ModeSkipPopulateJail
+}

internal/consts/maintenance.go

@@ -0,0 +1,15 @@
+package consts
+
+type MaintenanceMode string
+
+const (
+	ModeNone                       MaintenanceMode = "none"
+	ModeDownscale                  MaintenanceMode = "downscale"
+	ModeDownscaleAndDeletePopulate MaintenanceMode = "downscaleAndDeletePopulateJail"
+	ModeSkipPopulateJail           MaintenanceMode = "skipPopulateJail"
+)
+
+const (
+	ZeroReplicas   = int32(0)
+	SingleReplicas = int32(1)
+)

internal/controller/clustercontroller/populate_job.go

@@ -12,6 +12,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/log"
 
 	slurmv1 "nebius.ai/slurm-operator/api/v1"
+	"nebius.ai/slurm-operator/internal/check"
 	"nebius.ai/slurm-operator/internal/logfield"
 	"nebius.ai/slurm-operator/internal/render/populate_jail"
 	"nebius.ai/slurm-operator/internal/utils"
@@ -36,42 +37,60 @@ func (r SlurmClusterReconciler) ReconcilePopulateJail(
 					stepLogger := log.FromContext(stepCtx)
 					stepLogger.Info("Reconciling")
 
+					isMaintenanceStopMode := check.IsModeDownscaleAndDeletePopulate(clusterValues.PopulateJail.Maintenance)
 					desired := batchv1.Job{}
-					if getErr := r.Get(stepCtx,
+					getErr := r.Get(stepCtx,
 						client.ObjectKey{
 							Namespace: clusterValues.Namespace,
 							Name:      clusterValues.PopulateJail.Name,
 						},
 						&desired,
-					); getErr != nil {
-						if !apierrors.IsNotFound(getErr) {
-							stepLogger.Error(getErr, "Failed to get")
-							return errors.Wrap(getErr, "getting Populate jail Job")
+					)
+					if getErr == nil {
+						stepLogger.Info("Already exists")
+						if isMaintenanceStopMode {
+							stepLogger.Info("Deleting")
+							if err := r.Delete(stepCtx, &desired); err != nil {
+								stepLogger.Error(err, "Failed to delete")
+								return errors.Wrap(err, "deleting Populate jail Job")
+							}
+							stepLogger.Info("Deleted")
 						}
+						return nil
+					}
 
-						renderedDesired, err := populate_jail.RenderPopulateJailJob(
-							clusterValues.Namespace,
-							clusterValues.Name,
-							clusterValues.ClusterType,
-							clusterValues.NodeFilters,
-							clusterValues.VolumeSources,
-							&clusterValues.PopulateJail,
-						)
-						if err != nil {
-							stepLogger.Error(err, "Failed to render")
-							return errors.Wrap(err, "rendering Populate jail Job")
-						}
-						desired = *renderedDesired.DeepCopy()
+					if !apierrors.IsNotFound(getErr) && !isMaintenanceStopMode {
+						stepLogger.Error(getErr, "Failed to get")
+						return errors.Wrap(getErr, "getting Populate jail Job")
+					}
 
-						stepLogger = stepLogger.WithValues(logfield.ResourceKV(&desired)...)
-						stepLogger.Info("Rendered")
+					if isMaintenanceStopMode {
+						stepLogger.Info("Skipping creation due to MaintenanceStopMode")
+						return nil
+					}
 
-						if err = r.Job.Reconcile(stepCtx, cluster, &desired); err != nil {
-							stepLogger.Error(err, "Failed to reconcile")
-							return errors.Wrap(err, "reconciling Populate jail Job")
-						}
-						stepLogger.Info("Reconciled")
+					renderedDesired, err := populate_jail.RenderPopulateJailJob(
+						clusterValues.Namespace,
+						clusterValues.Name,
+						clusterValues.ClusterType,
+						clusterValues.NodeFilters,
+						clusterValues.VolumeSources,
+						&clusterValues.PopulateJail,
+					)
+					if err != nil {
+						stepLogger.Error(err, "Failed to render")
+						return errors.Wrap(err, "rendering Populate jail Job")
+					}
+					desired = *renderedDesired.DeepCopy()
+
+					stepLogger = stepLogger.WithValues(logfield.ResourceKV(&desired)...)
+					stepLogger.Info("Rendered")
+
+					if err = r.Job.Reconcile(stepCtx, cluster, &desired); err != nil {
+						stepLogger.Error(err, "Failed to reconcile")
+						return errors.Wrap(err, "reconciling Populate jail Job")
 					}
+					stepLogger.Info("Reconciled")
 
 					if pollErr := wait.PollUntilContextCancel(stepCtx,
 						10*time.Second,

internal/controller/clustercontroller/reconcile.go

@@ -226,8 +226,10 @@ func (r *SlurmClusterReconciler) reconcile(ctx context.Context, cluster *slurmv1
 	res, err := r.runWithPhase(ctx, cluster,
 		ptr.To(slurmv1.PhaseClusterReconciling),
 		func() (ctrl.Result, error) {
-			if err = r.ReconcilePopulateJail(ctx, clusterValues, cluster); err != nil {
-				return ctrl.Result{}, err
+			if !check.IsModeSkipPopulateJail(clusterValues.PopulateJail.Maintenance) {
+				if err = r.ReconcilePopulateJail(ctx, clusterValues, cluster); err != nil {
+					return ctrl.Result{}, err
+				}
 			}
 			if err = r.ReconcileCommon(ctx, cluster, clusterValues); err != nil {
 				return ctrl.Result{}, err

internal/controller/clustercontroller/worker.go

@@ -47,6 +47,7 @@ func (r SlurmClusterReconciler) ReconcileWorkers(
 						clusterValues.Name,
 						clusterValues.NodeWorker.K8sNodeFilterName,
 						clusterValues.NodeFilters,
+						clusterValues.NodeWorker.Maintenance,
 					)
 					stepLogger = stepLogger.WithValues(logfield.ResourceKV(&desired)...)
 					stepLogger.Info("Rendered")

internal/render/accounting/deployment.go

@@ -3,8 +3,10 @@ package accounting
 import (
 	appsv1 "k8s.io/api/apps/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/utils/ptr"
 
 	slurmv1 "nebius.ai/slurm-operator/api/v1"
+	"nebius.ai/slurm-operator/internal/check"
 	"nebius.ai/slurm-operator/internal/consts"
 	"nebius.ai/slurm-operator/internal/naming"
 	"nebius.ai/slurm-operator/internal/render/common"
@@ -32,6 +34,12 @@ func RenderDeployment(
 		return nil, err
 	}
 
+	replicas := &accounting.Deployment.Replicas
+
+	if check.IsMaintenanceActive(accounting.Maintenance) {
+		replicas = ptr.To(consts.ZeroReplicas)
+	}
+
 	return &appsv1.Deployment{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      naming.BuildDeploymentName(consts.ComponentTypeAccounting),
@@ -41,7 +49,7 @@ func RenderDeployment(
 		Spec: appsv1.DeploymentSpec{
 			// in Deployment mode replicas should be 1.
 			// Because of accounting requires a single instance.
-			Replicas: &accounting.Deployment.Replicas,
+			Replicas: replicas,
 			Strategy: appsv1.DeploymentStrategy{
 				Type: appsv1.RecreateDeploymentStrategyType,
 			},

internal/render/accounting/mariadb.go

@@ -10,6 +10,7 @@ import (
 	"k8s.io/utils/ptr"
 
 	slurmv1 "nebius.ai/slurm-operator/api/v1"
+	"nebius.ai/slurm-operator/internal/check"
 	"nebius.ai/slurm-operator/internal/consts"
 	"nebius.ai/slurm-operator/internal/naming"
 	"nebius.ai/slurm-operator/internal/render/common"
@@ -32,6 +33,10 @@ func RenderMariaDb(
 	labels := common.RenderLabels(consts.ComponentTypeMariaDbOperator, clusterName)
 	port, replicas, antiAffinityEnabled := getMariaDbConfig(mariaDb)
 
+	if check.IsMaintenanceActive(accounting.Maintenance) {
+		replicas = consts.ZeroReplicas
+	}
+
 	nodeFilter, err := utils.GetBy(
 		nodeFilters,
 		accounting.K8sNodeFilterName,

internal/render/benchmark/cronjob.go

@@ -45,7 +45,7 @@ func RenderNCCLBenchmarkCronJob(
 				Spec: batchv1.JobSpec{
 					Parallelism:  ptr.To(int32(1)),
 					Completions:  ptr.To(int32(1)),
-					BackoffLimit: ptr.To(int32(0)),
+					BackoffLimit: ptr.To(consts.ZeroReplicas),
 					Template: corev1.PodTemplateSpec{
 						ObjectMeta: metav1.ObjectMeta{
 							Labels: labels,