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YAML script gets NFSv4 access denied because OpenShift is using AUTH_NULL to access NTFS security style root volume

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Category:
ontap-9
Specialty:
NAS
Last Updated:

Applies to

  • ONTAP 9
  • NFSv4
  • YAML
  • OpenShift
  • K8s

Issue

  • application-prod.yml file scripts an automated job that creates an OpenShift or K8s container which uses NFSv4 to create a file foo.bar in an ONTAP volume that has junction path /vol1/vol2
  • Job fails due to a permission denial
    • Unable to copy file foo.bar: /vol1
    • Caused by: java.nio.file.AccessDeniedException
  • Packet trace shows that
    • Client sends V4 Call SECINFO_NO_NAME
    • ONTAP sends V4 Reply SECINFO_NO_NAME which contains flavor: AUTH_NULL (0) as the first entry in the Flavors Info list
    • Client sends V4 Call ACCESS with Flavor: AUTH_NULL (0) for the SVM's root volume
    • ONTAP sends V4 Reply ACCESS Status: NFS4ERR_ACCESS
    • Client sends V4 Call DESTROY_SESSION
  • Within the OpenShift container, grep nfs /proc/mounts shows that server:/vol1/vol2 is mounted at /mount_point with sec=sys
  • application-prod.yml contains
    • nfs:
          path: /vol1/vol2
  • The SVM's root volume's export policy squashes anonymous users to the Unix user account with UIDnumber 65534 and username pcuser  because User ID To Which Anonymous Users Are Mapped: 65534
    • vserver export-policy rule show -vserver svm1 -policyname root_vol_export_policy -instance
  • The SVM's root volume with junction path / has NTFS security style
    • file-directory show -vserver svm1 -path /

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