feat: propagate default host configuration files to csi node

Author: vlboiko

charts/README.md

@@ -47,6 +47,7 @@ The following table lists the configurable parameters of the latest NFS CSI Driv
 | `driver.mountPermissions`                         | default mounted folder permissions                             | `0`
 | `feature.enableFSGroupPolicy`                     | enable [`fsGroupPolicy`](https://kubernetes.io/blog/2020/12/14/kubernetes-release-1.20-fsgroupchangepolicy-fsgrouppolicy/#allow-csi-drivers-to-declare-support-for-fsgroup-based-permissions) on a k8s 1.20+ cluster              | `true`                      |
 | `feature.enableInlineVolume`                      | enable inline volume                     | `false`                      |
+| `feature.propagateHostMountOptions`               | use the default host NFS mount configuration file [`/etc/nfsmount.conf`](https://man7.org/linux/man-pages/man5/nfsmount.conf.5.html) and/or the default host `/etc/nfsmount.d` mount configuration directory as source for mount options | `false`                      |
 | `kubeletDir`                                      | alternative kubelet directory                              | `/var/lib/kubelet`                                                  |
 | `image.nfs.repository`                            | csi-driver-nfs image                                       | `registry.k8s.io/sig-storage/nfsplugin`                          |
 | `image.nfs.tag`                                   | csi-driver-nfs image tag                                   | `latest`                                                |

charts/latest/csi-driver-nfs-v0.0.0.tgz

@@ -125,6 +125,12 @@ spec:
             - name: pods-mount-dir
               mountPath: {{ .Values.kubeletDir }}/pods
               mountPropagation: "Bidirectional"
+            {{- if .Values.feature.propagateHostMountOptions }}
+            - name: host-nfsmount-conf
+              mountPath: /etc/nfsmount.conf
+            - name: host-nfsmount-conf-d
+              mountPath: /etc/nfsmount.conf.d
+            {{- end }}
           resources: {{- toYaml .Values.node.resources.nfs | nindent 12 }}
       volumes:
         - name: socket-dir
@@ -139,3 +145,13 @@ spec:
             path: {{ .Values.kubeletDir }}/plugins_registry
             type: Directory
           name: registration-dir
+        {{- if .Values.feature.propagateHostMountOptions }}
+        - hostPath:
+            path: /etc/nfsmount.conf
+            type: FileOrCreate
+          name: host-nfsmount-conf
+        - hostPath:
+            path: /etc/nfsmount.conf.d
+            type: DirectoryOrCreate
+          name: host-nfsmount-conf-d
+        {{- end }}

charts/latest/csi-driver-nfs/templates/csi-nfs-node.yaml

@@ -41,6 +41,7 @@ driver:
 feature:
   enableFSGroupPolicy: true
   enableInlineVolume: false
+  propagateHostMountOptions: false
 
 kubeletDir: /var/lib/kubelet