Replace StatefulSets with a customized controller

Based on the original [PR](etcd-io#363 (comment))

Signed-off-by: Nont <9658731+nwnt@users.noreply.github.com>

Author: ahrtr

api/v1alpha1/etcdcluster_types.go

@@ -143,13 +143,11 @@ type EtcdClusterStatus struct {
 	// +optional
 	ObservedGeneration int64 `json:"observedGeneration,omitempty"`
 
-	// CurrentReplicas is the number of etcd pods managed by the StatefulSet for this cluster.
-	// This reflects the .spec.replicas of the underlying StatefulSet.
+	// CurrentReplicas is the number of etcd member pods currently owned by this cluster.
 	// +optional
 	CurrentReplicas int32 `json:"currentReplicas,omitempty"`
 
-	// ReadyReplicas is the number of etcd pods managed by the StatefulSet that are currently ready.
-	// This reflects the .status.readyReplicas of the underlying StatefulSet.
+	// ReadyReplicas is the number of etcd member pods that are currently Ready.
 	// +optional
 	ReadyReplicas int32 `json:"readyReplicas,omitempty"`
 

api/v1alpha1/zz_generated.deepcopy.go

@@ -3,7 +3,7 @@ apiVersion: apiextensions.k8s.io/v1
 kind: CustomResourceDefinition
 metadata:
   annotations:
-    controller-gen.kubebuilder.io/version: v0.20.1
+    controller-gen.kubebuilder.io/version: v0.21.0
   name: etcdclusters.operator.etcd.io
 spec:
   group: operator.etcd.io
@@ -1256,9 +1256,8 @@ spec:
                 - type
                 x-kubernetes-list-type: map
               currentReplicas:
-                description: |-
-                  CurrentReplicas is the number of etcd pods managed by the StatefulSet for this cluster.
-                  This reflects the .spec.replicas of the underlying StatefulSet.
+                description: CurrentReplicas is the number of etcd member pods currently
+                  owned by this cluster.
                 format: int32
                 type: integer
               currentVersion:
@@ -1327,9 +1326,8 @@ spec:
                 format: int64
                 type: integer
               readyReplicas:
-                description: |-
-                  ReadyReplicas is the number of etcd pods managed by the StatefulSet that are currently ready.
-                  This reflects the .status.readyReplicas of the underlying StatefulSet.
+                description: ReadyReplicas is the number of etcd member pods that
+                  are currently Ready.
                 format: int32
                 type: integer
             type: object

config/crd/bases/operator.etcd.io_etcdclusters.yaml

@@ -4,20 +4,6 @@ kind: ClusterRole
 metadata:
   name: manager-role
 rules:
-- apiGroups:
-  - ""
-  resources:
-  - configmaps
-  - secrets
-  - services
-  verbs:
-  - create
-  - delete
-  - get
-  - list
-  - patch
-  - update
-  - watch
 - apiGroups:
   - ""
   resources:
@@ -29,9 +15,12 @@ rules:
   - patch
   - update
 - apiGroups:
-  - apps
+  - ""
   resources:
-  - statefulsets
+  - persistentvolumeclaims
+  - pods
+  - secrets
+  - services
   verbs:
   - create
   - delete