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Intermittent NFS access denials due to negative netgroup lookups from NIS in ONTAP 9

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • NFS
  • Netgroups
  • NIS

Issue

  • Intermittent Permission Denied or Access Denied when mounting or accessing files
  • Relevant export-policy uses netgroups to validate hosts
  • vserver export-policy netgroup check-membership command intermittently returns incorrect results
  • Hostname is confirmed to exist in the relevant netgroup on the NIS server
  • In MGWD we can see where no rules are matched in this scenario: 
    Fri Jul 30 2020 11:28:45 -04:00 [kern_mgwd:info:1670] | [0.332.939]  info :  Authoritatively returning zero rules: CliAddr=10.10.10.10, vsid=12, rulesetid=25869803777, isRefresh=true, ruleCount=0, Result=0(no error)  { in mgwd_export_check_1_svc() at src/mgmtgwd/nfs/mgwd_exports.cc:1824 }

 

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