feat(resource limits): add resource limits and request on NFS Provisioner (#89)

This PR adds resources requests and limits values after
monitoring nfs-provisioner behavior during the idle and busy time.

Steps performed to monitor:
Noted the values of CPU & memory usage after applying nfs-provisioner
YAML. Provisioned 50 NFS-PVCs, 100 NFS-PVCs at a time and collected the
memory & CPU usage of the nfs-provisioner periodically.

Signed-off-by: mittachaitu <[email protected]>

Author: sai chaithanya

deploy/helm/charts/Chart.yaml

@@ -4,7 +4,7 @@ description: Helm chart for OpenEBS Dynamic NFS PV. For instructions to install
 type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
-version: 0.5.1
+version: 0.5.2
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application.
 appVersion: 0.5.0

deploy/helm/charts/values.yaml

@@ -52,12 +52,16 @@ nfsProvisioner:
   # choice for the user. This also increases chances charts run on environments with little
   # resources, such as Minikube. If you do want to specify resources, uncomment the following
   # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+  #   ## Normal cases CPU and memory usage are around ~10 millicores and
+  #   ## memory usage is around ~16Mb(after provisioing 70 volumes)
   #   requests:
-  #     cpu: 100m
-  #     memory: 128Mi
+  #     cpu: 50m
+  #     memory: 50M
+  #   ## During provisioning(large no.of pvcs at a time) time CPU and memory usage
+  #   ## are around ~67 millicores(6.7% of cpu) and memory usage is around ~34Mb
   #   limits:
-  #     cpu: 100m
-  #     memory: 128Mi
+  #     cpu: 200m
+  #     memory: 200Mi
   # If set to false, containers created by the nfs provisioner will run without extra privileges.
   privileged: true
   nodeSelector: {}

deploy/kubectl/openebs-nfs-provisioner.yaml

@@ -160,6 +160,21 @@ spec:
             - test `pgrep "^provisioner-nfs.*"` = 1
           initialDelaySeconds: 30
           periodSeconds: 60
+        resources:
+        # We usually recommend not to specify default resources and to leave this as a conscious
+        # choice for the user. This also increases chances charts run on environments with little
+        # resources, such as Minikube. If you do want to specify resources, uncomment the following
+        # lines, adjust them as necessary, and remove the curly braces after 'resources:'.
+        # ## Normal cases CPU and memory usage are around ~10 millicores and
+        # ## memory usage is around ~16Mb(after provisioing 70 volumes)
+          requests:
+            cpu: 50m
+            memory: 50M
+          ## During provisioning(large no.of pvcs at a time) time CPU and memory usage
+          ## are around ~67 millicores(6.7% of cpu) and memory usage is around ~34Mb
+          limits:
+            cpu: 200m
+            memory: 200M
 ---
 #Sample storage classes for OpenEBS Local PV
 apiVersion: storage.k8s.io/v1