fix: krb5CacheDirectory mount path issue

charts/README.md

@@ -102,8 +102,8 @@ The following table lists the configurable parameters of the latest SMB CSI Driv
 | `linux.dsName`                                          | name of driver daemonset on linux                                                                          | `csi-smb-node`                                          |
 | `linux.dnsPolicy`                                       | dnsPolicy of driver node daemonset, available values: `Default`, `ClusterFirstWithHostNet`, `ClusterFirst` | `ClusterFirstWithHostNet`                               |
 | `linux.kubelet`                                         | configure kubelet directory path on Linux agent node node                                                  | `/var/lib/kubelet`                                      |
-| `linux.krb5CacheDirectory`                              | directory for kerberos cache on Linux agent node node                                                  | `/var/lib/kubelet/kerberos/`                                      |
-| `linux.krb5Prefix`                                      | prefix for kerberos cache on Linux agent node node                                                  | `krb5cc_`                                      |
+| `linux.krb5CacheDirectory`                              | directory for kerberos cache on Linux agent node node, empty string means default                          | `/var/lib/kubelet/kerberos/`                            |
+| `linux.krb5Prefix`                                      | prefix for kerberos cache on Linux agent node node, empty string means default                             | `krb5cc_`                                               |
 | `linux.resources.livenessProbe.limits.memory`           | liveness-probe memory limits                                                                               | `100Mi`                                                 |
 | `linux.resources.livenessProbe.requests.cpu`            | liveness-probe cpu requests limits                                                                         | `10m`                                                   |
 | `linux.resources.livenessProbe.requests.memory`         | liveness-probe memory requests limits                                                                      | `20Mi`                                                  |

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

@@ -139,6 +139,11 @@ spec:
             - mountPath: /var/lib/kubelet/
               mountPropagation: Bidirectional
               name: mountpoint-dir
+{{- if ne .Values.linux.krb5CacheDirectory "" }}
+            - mountPath: {{ .Values.linux.krb5CacheDirectory }}
+              mountPropagation: Bidirectional
+              name: krb5Cache-dir
+{{- end }}
           resources: {{- toYaml .Values.linux.resources.smb | nindent 12 }}
       volumes:
         - hostPath:
@@ -153,4 +158,10 @@ spec:
             path: {{ .Values.linux.kubelet }}/plugins_registry/
             type: DirectoryOrCreate
           name: registration-dir
+{{- if ne .Values.linux.krb5CacheDirectory "" }}
+        - hostPath:
+            path: {{ .Values.linux.krb5CacheDirectory }}
+            type: DirectoryOrCreate
+          name: krb5Cache-dir
+{{- end }}
 {{- end -}}

charts/latest/csi-driver-smb/values.yaml

@@ -92,8 +92,8 @@ linux:
   dsName: csi-smb-node # daemonset name
   dnsPolicy: ClusterFirstWithHostNet  # available values: Default, ClusterFirstWithHostNet, ClusterFirst
   kubelet: /var/lib/kubelet
-  krb5CacheDirectory: /var/lib/kubelet/kerberos/ # directory for kerberos credential cache
-  krb5Prefix: "krb5cc_" # prefix for kerberos credential cache
+  krb5CacheDirectory: "" # directory for kerberos credential cache, empty string means default(/var/lib/kubelet/kerberos/)
+  krb5Prefix: "" # prefix for kerberos credential cache, empty string means default(krb5cc_)
   tolerations:
     - operator: "Exists"
   resources:

cmd/smbplugin/main.go

@@ -45,8 +45,8 @@ var (
 	removeSMBMappingDuringUnmount = flag.Bool("remove-smb-mapping-during-unmount", true, "remove SMBMapping during unmount on Windows node")
 	workingMountDir               = flag.String("working-mount-dir", "/tmp", "working directory for provisioner to mount smb shares temporarily")
 	volStatsCacheExpireInMinutes  = flag.Int("vol-stats-cache-expire-in-minutes", 10, "The cache expire time in minutes for volume stats cache")
-	krb5CacheDirectory            = flag.String("krb5-cache-directory", "/var/lib/kubelet/kerberos/", "The directory for kerberos cache")
-	krb5Prefix                    = flag.String("krb5-prefix", "krb5cc_", "The prefix for kerberos cache")
+	krb5CacheDirectory            = flag.String("krb5-cache-directory", smb.DefaultKrb5CacheDirectory, "The directory for kerberos cache")
+	krb5Prefix                    = flag.String("krb5-prefix", smb.DefaultKrb5CCName, "The prefix for kerberos cache")
 )
 
 func main() {

pkg/smb/smb.go

@@ -32,20 +32,22 @@ import (
 )
 
 const (
-	DefaultDriverName    = "smb.csi.k8s.io"
-	usernameField        = "username"
-	passwordField        = "password"
-	sourceField          = "source"
-	subDirField          = "subdir"
-	domainField          = "domain"
-	mountOptionsField    = "mountoptions"
-	defaultDomainName    = "AZURE"
-	pvcNameKey           = "csi.storage.k8s.io/pvc/name"
-	pvcNamespaceKey      = "csi.storage.k8s.io/pvc/namespace"
-	pvNameKey            = "csi.storage.k8s.io/pv/name"
-	pvcNameMetadata      = "${pvc.metadata.name}"
-	pvcNamespaceMetadata = "${pvc.metadata.namespace}"
-	pvNameMetadata       = "${pv.metadata.name}"
+	DefaultDriverName         = "smb.csi.k8s.io"
+	usernameField             = "username"
+	passwordField             = "password"
+	sourceField               = "source"
+	subDirField               = "subdir"
+	domainField               = "domain"
+	mountOptionsField         = "mountoptions"
+	defaultDomainName         = "AZURE"
+	pvcNameKey                = "csi.storage.k8s.io/pvc/name"
+	pvcNamespaceKey           = "csi.storage.k8s.io/pvc/namespace"
+	pvNameKey                 = "csi.storage.k8s.io/pv/name"
+	pvcNameMetadata           = "${pvc.metadata.name}"
+	pvcNamespaceMetadata      = "${pvc.metadata.namespace}"
+	pvNameMetadata            = "${pv.metadata.name}"
+	DefaultKrb5CCName         = "krb5cc_"
+	DefaultKrb5CacheDirectory = "/var/lib/kubelet/kerberos/"
 )
 
 // DriverOptions defines driver parameters specified in driver deployment
@@ -88,9 +90,16 @@ func NewDriver(options *DriverOptions) *Driver {
 	driver.enableGetVolumeStats = options.EnableGetVolumeStats
 	driver.removeSMBMappingDuringUnmount = options.RemoveSMBMappingDuringUnmount
 	driver.workingMountDir = options.WorkingMountDir
+	driver.volumeLocks = newVolumeLocks()
+
 	driver.krb5CacheDirectory = options.Krb5CacheDirectory
+	if driver.krb5CacheDirectory == "" {
+		driver.krb5CacheDirectory = DefaultKrb5CacheDirectory
+	}
 	driver.krb5Prefix = options.Krb5Prefix
-	driver.volumeLocks = newVolumeLocks()
+	if driver.krb5Prefix == "" {
+		driver.krb5Prefix = DefaultKrb5CCName
+	}
 
 	if options.VolStatsCacheExpireInMinutes <= 0 {
 		options.VolStatsCacheExpireInMinutes = 10 // default expire in 10 minutes