storage-operator: add stub PersistentVolume creation

Author: NicolasT

storage-operator/deploy/crds/storage_v1alpha1_volume_cr.yaml

@@ -3,5 +3,5 @@ kind: Volume
 metadata:
   name: example-volume
 spec:
-  # Add fields here
-  size: 3
+  nodeName: bootstrap
+  storageClassName: default

storage-operator/deploy/crds/storage_v1alpha1_volume_crd.yaml

@@ -28,6 +28,16 @@ spec:
         metadata:
           type: object
         spec:
+          properties:
+            nodeName:
+              description: Name of the node on which the volume is available
+              type: string
+            storageClassName:
+              description: Name of the StorageClass that gets assigned to the volume
+              type: string
+          required:
+          - nodeName
+          - storageClassName
           type: object
         status:
           type: object

storage-operator/go.sum

@@ -35,7 +35,9 @@ github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
 github.com/emicklei/go-restful v2.8.1+incompatible h1:AyDqLHbJ1quqbWr/OWDw+PlIP8ZFoTmYrGYaxzrLbNg=
 github.com/emicklei/go-restful v2.8.1+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
+github.com/evanphx/json-patch v4.0.0+incompatible h1:xregGRMLBeuRcwiOTHRCsPPuzCQlqhxUPbqdw+zNkLc=
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+github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
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 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
@@ -74,6 +76,7 @@ github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c h1:964Od4U6p2jUkFxvCydnIczKteheJEzHRToSGK3Bnlw=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
+github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
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@@ -92,6 +95,7 @@ github.com/grpc-ecosystem/grpc-gateway v1.8.5 h1:2+KSC78XiO6Qy0hIjfc1OD9H+hsaJdJ
 github.com/grpc-ecosystem/grpc-gateway v1.8.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
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 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
+github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
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@@ -105,9 +109,11 @@ github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvW
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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@@ -121,7 +127,9 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
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+github.com/onsi/ginkgo v1.7.0 h1:WSHQ+IS43OoUrWtD1/bbclrwK8TTH5hzp+umCiuxHgs=
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
+github.com/onsi/gomega v1.4.3 h1:RE1xgDvH7imwFD45h+u2SgIfERHlS2yNG4DObb5BSKU=
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@@ -135,6 +143,7 @@ github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
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+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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 github.com/prometheus/client_golang v0.9.3-0.20190127221311-3c4408c8b829 h1:D+CiwcpGTW6pL6bv6KI3KbyEyCKyS+1JWS2h8PNDnGA=
@@ -152,7 +161,6 @@ github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6So
 github.com/rogpeppe/go-internal v1.1.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rogpeppe/go-internal v1.2.2 h1:J7U/N7eRtzjhs26d6GqMh2HBuXP8/Z64Densiiieafo=
 github.com/rogpeppe/go-internal v1.2.2/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
-github.com/scality/metalk8s v0.0.0-20190529070749-28eb23447f4b h1:CYnX8hV/u/XQ1iEsfjamcZCX6itt8GUFtaj8YyoWvPU=
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@@ -162,6 +170,7 @@ github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnIn
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+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
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 go.opencensus.io v0.19.1/go.mod h1:gug0GbSHa8Pafr0d2urOSgoXHZ6x/RUlaiT0d9pqb4A=
 go.opencensus.io v0.19.2 h1:ZZpq6xI6kv/LuE/5s5UQvBU5vMjvRnPb8PvJrIntAnc=
@@ -244,12 +253,15 @@ google.golang.org/grpc v1.19.1 h1:TrBcJ1yqAl1G++wO39nD/qtgpsW9/1+QGrluyMGEYgM=
 google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
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+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
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@@ -278,6 +290,7 @@ sigs.k8s.io/controller-runtime v0.1.10 h1:amLOmcekVdnsD1uIpmgRqfTbQWJ2qxvQkcdeFh
 sigs.k8s.io/controller-runtime v0.1.10/go.mod h1:HFAYoOh6XMV+jKF1UjFwrknPbowfyHEHHRdJMf2jMX8=
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+sigs.k8s.io/testing_frameworks v0.1.0 h1:2hBE1sDhKWALoqvhi2i/mnQOFZVfWtQFtsfH0QBTI0U=
 sigs.k8s.io/testing_frameworks v0.1.0/go.mod h1:VVBKrHmJ6Ekkfz284YKhQePcdycOzNH9qL6ht1zEr/U=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
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storage-operator/pkg/apis/storage/v1alpha1/volume_types.go

@@ -2,6 +2,7 @@ package v1alpha1
 
 import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
 )
 
 // EDIT THIS FILE!  THIS IS SCAFFOLDING FOR YOU TO OWN!
@@ -13,6 +14,12 @@ type VolumeSpec struct {
 	// INSERT ADDITIONAL SPEC FIELDS - desired state of cluster
 	// Important: Run "operator-sdk generate k8s" to regenerate code after modifying this file
 	// Add custom validation using kubebuilder tags: https://book.kubebuilder.io/beyond_basics/generating_crd.html
+
+	// Name of the node on which the volume is available
+	NodeName types.NodeName `json:"nodeName"`
+
+	// Name of the StorageClass that gets assigned to the volume
+	StorageClassName string `json:"storageClassName"`
 }
 
 // VolumeStatus defines the observed state of Volume

storage-operator/pkg/apis/storage/v1alpha1/zz_generated.openapi.go

@@ -6,9 +6,13 @@ import (
 	storagev1alpha1 "github.com/scality/metalk8s/storage-operator/pkg/apis/storage/v1alpha1"
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/api/resource"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
 	"sigs.k8s.io/controller-runtime/pkg/handler"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
@@ -18,11 +22,6 @@ import (
 
 var log = logf.Log.WithName("controller_volume")
 
-/**
-* USER ACTION REQUIRED: This is a scaffold file intended for the user to modify with their own Controller
-* business logic.  Delete these comments after modifying this file.*
- */
-
 // Add creates a new Volume Controller and adds it to the Manager. The Manager will set fields on the Controller
 // and Start it when the Manager is Started.
 func Add(mgr manager.Manager) error {
@@ -48,9 +47,8 @@ func add(mgr manager.Manager, r reconcile.Reconciler) error {
 		return err
 	}
 
-	// TODO(user): Modify this to be the types you create that are owned by the primary resource
 	// Watch for changes to secondary resource Pods and requeue the owner Volume
-	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForOwner{
+	err = c.Watch(&source.Kind{Type: &corev1.PersistentVolume{}}, &handler.EnqueueRequestForOwner{
 		IsController: true,
 		OwnerType:    &storagev1alpha1.Volume{},
 	})
@@ -91,11 +89,92 @@ func (r *ReconcileVolume) Reconcile(request reconcile.Request) (reconcile.Result
 			// Request object not found, could have been deleted after reconcile request.
 			// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
 			// Return and don't requeue
+                        // TODO Remove the finalizer from the generated PV, if exists
 			return reconcile.Result{}, nil
 		}
 		// Error reading the object - requeue the request.
 		return reconcile.Result{}, err
 	}
 
+	pv := newPersistentVolumeForCR(instance)
+
+	// Set Volume instance as the owner and controller
+	if err := controllerutil.SetControllerReference(instance, pv, r.scheme); err != nil {
+		return reconcile.Result{}, err
+	}
+
+	// Check if this PV already exists
+	found := &corev1.PersistentVolume{}
+	err = r.client.Get(context.TODO(), types.NamespacedName{Namespace: "", Name: pv.Name}, found)
+	if err != nil && errors.IsNotFound(err) {
+		reqLogger.Info("Creating a new PersistentVolume", "PersistentVolume.Name", pv.Name)
+		err = r.client.Create(context.TODO(), pv)
+		if err != nil {
+			return reconcile.Result{}, err
+		}
+
+		// PV created successfully - don't requeue
+		return reconcile.Result{}, nil
+	} else if err != nil {
+		return reconcile.Result{}, err
+	}
+
+	// PV already exists - don't requeue
+	reqLogger.Info("Skip reconcile: PersistentVolume already exists", "PersistentVolume.Name", found.Name)
+
 	return reconcile.Result{}, nil
 }
+
+func newPersistentVolumeForCR(cr *storagev1alpha1.Volume) *corev1.PersistentVolume {
+	return &corev1.PersistentVolume{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:   cr.Name,
+                        Labels: map[string]string{},
+                        Finalizers: []string{
+                                "storage.metalk8s.scality.com/volume-protection",
+                        },
+		},
+		Spec: corev1.PersistentVolumeSpec{
+			AccessModes: []corev1.PersistentVolumeAccessMode{corev1.ReadWriteOnce},
+			Capacity: map[corev1.ResourceName]resource.Quantity{
+				corev1.ResourceStorage: resource.MustParse("1Gi"),
+			},
+			PersistentVolumeSource: corev1.PersistentVolumeSource{
+				Local: &corev1.LocalVolumeSource{
+					Path: "/tmp/foo",
+				},
+			},
+			PersistentVolumeReclaimPolicy: "Retain",
+			StorageClassName:              cr.Spec.StorageClassName,
+                        NodeAffinity:                  nodeAffinity(cr.Spec.NodeName),
+		},
+	}
+}
+
+func nodeAffinity(node types.NodeName) *corev1.VolumeNodeAffinity {
+	selector := corev1.NodeSelector{
+		NodeSelectorTerms: []corev1.NodeSelectorTerm{
+			{
+                                MatchExpressions: []corev1.NodeSelectorRequirement{
+                                        {
+                                                Key: "kubernetes.io/hostname",
+                                                Operator: corev1.NodeSelectorOpIn,
+                                                Values: []string{string(node)},
+                                        },
+                                },
+				MatchFields: []corev1.NodeSelectorRequirement{
+					{
+						Key:      "metadata.name",
+						Operator: corev1.NodeSelectorOpIn,
+						Values:   []string{string(node)},
+					},
+				},
+			},
+		},
+	}
+	affinity := corev1.VolumeNodeAffinity{
+		Required: &selector,
+	}
+	return &affinity
+
+}