Bug 2279992: csi: add a new flag to disable csi driver

Documentation/Helm-Charts/operator-chart.md

@@ -76,6 +76,7 @@ The following table lists the configurable parameters of the rook-operator chart
 | `csi.csiRBDPluginVolume` | The volume of the CephCSI RBD plugin DaemonSet | `nil` |
 | `csi.csiRBDPluginVolumeMount` | The volume mounts of the CephCSI RBD plugin DaemonSet | `nil` |
 | `csi.csiRBDProvisionerResource` | CEPH CSI RBD provisioner resource requirement list csi-omap-generator resources will be applied only if `enableOMAPGenerator` is set to `true` | see values.yaml |
+| `csi.disableCsiDriver` | Disable the CSI driver. | `"false"` |
 | `csi.enableCSIEncryption` | Enable Ceph CSI PVC encryption support | `false` |
 | `csi.enableCSIHostNetwork` | Enable host networking for CSI CephFS and RBD nodeplugins. This may be necessary in some network configurations where the SDN does not provide access to an external cluster or there is significant drop in read/write performance | `true` |
 | `csi.enableCephfsDriver` | Enable Ceph CSI CephFS driver | `true` |

deploy/charts/rook-ceph/templates/configmap.yaml

@@ -17,6 +17,7 @@ data:
 {{- if .Values.csi }}
   ROOK_CSI_ENABLE_RBD: {{ .Values.csi.enableRbdDriver | quote }}
   ROOK_CSI_ENABLE_CEPHFS: {{ .Values.csi.enableCephfsDriver | quote }}
+  ROOK_CSI_DISABLE_DRIVER: {{ .Values.csi.disableCsiDriver | quote }}
   CSI_ENABLE_CEPHFS_SNAPSHOTTER: {{ .Values.csi.enableCephfsSnapshotter | quote }}
   CSI_ENABLE_NFS_SNAPSHOTTER: {{ .Values.csi.enableNFSSnapshotter | quote }}
   CSI_ENABLE_RBD_SNAPSHOTTER: {{ .Values.csi.enableRBDSnapshotter | quote }}

deploy/charts/rook-ceph/values.yaml

@@ -82,6 +82,9 @@ csi:
   enableRbdDriver: true
   # -- Enable Ceph CSI CephFS driver
   enableCephfsDriver: true
+  # -- Disable the CSI driver.
+  disableCsiDriver: "false"
+
   # -- Enable host networking for CSI CephFS and RBD nodeplugins. This may be necessary
   # in some network configurations where the SDN does not provide access to an external cluster or
   # there is significant drop in read/write performance

deploy/examples/operator-openshift.yaml

@@ -121,6 +121,8 @@ data:
   ROOK_CSI_ENABLE_RBD: "true"
   # Enable the CSI NFS driver. To start another version of the CSI driver, see image properties below.
   ROOK_CSI_ENABLE_NFS: "false"
+  # Disable the CSI driver.
+  ROOK_CSI_DISABLE_DRIVER: "false"
 
   # Set to true to enable Ceph CSI pvc encryption support.
   CSI_ENABLE_ENCRYPTION: "false"

deploy/examples/operator.yaml

@@ -35,6 +35,8 @@ data:
   ROOK_CSI_ENABLE_RBD: "true"
   # Enable the CSI NFS driver. To start another version of the CSI driver, see image properties below.
   ROOK_CSI_ENABLE_NFS: "false"
+  # Disable the CSI driver.
+  ROOK_CSI_DISABLE_DRIVER: "false"
 
   # Set to true to enable Ceph CSI pvc encryption support.
   CSI_ENABLE_ENCRYPTION: "false"

pkg/operator/ceph/csi/controller.go

@@ -134,6 +134,34 @@ func (r *ReconcileCSI) reconcile(request reconcile.Request) (reconcile.Result, e
 	// reconcileResult is used to communicate the result of the reconciliation back to the caller
 	var reconcileResult reconcile.Result
 
+	// Fetch the operator's configmap. We force the NamespaceName to the operator since the request
+	// could be a CephCluster. If so the NamespaceName will be the one from the cluster and thus the
+	// CM won't be found
+	opNamespaceName := types.NamespacedName{Name: opcontroller.OperatorSettingConfigMapName, Namespace: r.opConfig.OperatorNamespace}
+	opConfig := &v1.ConfigMap{}
+	err := r.client.Get(r.opManagerContext, opNamespaceName, opConfig)
+	if err != nil {
+		if kerrors.IsNotFound(err) {
+			logger.Debug("operator's configmap resource not found. will use default value or env var.")
+			r.opConfig.Parameters = make(map[string]string)
+		} else {
+			// Error reading the object - requeue the request.
+			return opcontroller.ImmediateRetryResult, errors.Wrap(err, "failed to get operator's configmap")
+		}
+	} else {
+		// Populate the operator's config
+		r.opConfig.Parameters = opConfig.Data
+	}
+
+	// do not recocnile if csi driver is disabled
+	disableCSI, err := strconv.ParseBool(k8sutil.GetValue(r.opConfig.Parameters, "ROOK_CSI_DISABLE_DRIVER", "false"))
+	if err != nil {
+		return reconcile.Result{}, errors.Wrap(err, "unable to parse value for 'ROOK_CSI_DISABLE_DRIVER")
+	} else if disableCSI {
+		logger.Info("ceph csi driver is disabled")
+		return reconcile.Result{}, nil
+	}
+
 	serverVersion, err := r.context.Clientset.Discovery().ServerVersion()
 	if err != nil {
 		return opcontroller.ImmediateRetryResult, errors.Wrap(err, "failed to get server version")
@@ -168,24 +196,6 @@ func (r *ReconcileCSI) reconcile(request reconcile.Request) (reconcile.Result, e
 
 		return reconcile.Result{}, nil
 	}
-	// Fetch the operator's configmap. We force the NamespaceName to the operator since the request
-	// could be a CephCluster. If so the NamespaceName will be the one from the cluster and thus the
-	// CM won't be found
-	opNamespaceName := types.NamespacedName{Name: opcontroller.OperatorSettingConfigMapName, Namespace: r.opConfig.OperatorNamespace}
-	opConfig := &v1.ConfigMap{}
-	err = r.client.Get(r.opManagerContext, opNamespaceName, opConfig)
-	if err != nil {
-		if kerrors.IsNotFound(err) {
-			logger.Debug("operator's configmap resource not found. will use default value or env var.")
-			r.opConfig.Parameters = make(map[string]string)
-		} else {
-			// Error reading the object - requeue the request.
-			return opcontroller.ImmediateRetryResult, errors.Wrap(err, "failed to get operator's configmap")
-		}
-	} else {
-		// Populate the operator's config
-		r.opConfig.Parameters = opConfig.Data
-	}
 
 	csiHostNetworkEnabled, err := strconv.ParseBool(k8sutil.GetValue(r.opConfig.Parameters, "CSI_ENABLE_HOST_NETWORK", "true"))
 	if err != nil {