** Description changed: - In a previous Ubuntu upgrade to 13.10, there was a problem with AUTH_GSS + In a previous Ubuntu upgrade to 13.10, there was a problem with rpc.gssd timeouts on NFS v3 mount attempts slowing down NFSv3 mounting. Several workarounds existed, one of which was to explicitly list "sec=sys" as an /etc/fstab mount option. The NFS server in this case is a NetGear ReadyNAS PRO running Debian, kernel: 2.6.37.6.RNx86_64.2.4 The NFS server is not involved in this problem, it is purely client side. changing squash settings on the server side was tested and had no impact on the problem. - It appears there is a kernel fix somewhere around 3.12.7-2 for the - original AUTH_GSS timeout problem causing the workaround. - - On upgrade from from 13.04 to 13.10, NFSv3 mounts stop working if + On upgrade from from 13.10 to 14.04, NFSv3 mounts stop working if sec=sys is specified in /etc/fstab. Specifically, the mount works, but access to files receive client side permission denial. Investigation showed that if the directory was mounted 777 and a test file was created, then the file had uid/gid nobody/nogroup instead of the expected client side UID/GID. wireshark clearly showed that with sec=sys on the fstab options, the RPC credentials were AUTH_NULL. If sec=sys is removed from the fstab options, then RPC credentials are now AUTH_UNIX. Repeat by: - create /c/tmp directory mode 777 on NFS file server where /etc/passwd & group are coordinated with the client - export /c/tmp as insecure,insecure_locks,rw,sync - add directory to /etc/fstab, options auto,sec=sys,nfsvers=3: nas:/c/tmp /mnt nfs auto,sec=sys,nfsvers=3 0 0 - execute the following while conducting dumpcap: sudo mount /mnt touch /mnt/test ls -l /mnt/test - observe file is nobody/nogroup - observe RPC credentials are AUTH_NULL in wireshark - remove sys=sec from fstab and repeat above. - result will be correct uid/gid & RPC credentials of AUTH_UNIX ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: nfs-common 1:1.2.8-6ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 CurrentDesktop: Unity Date: Sun May 4 21:23:26 2014 InstallationDate: Installed on 2012-11-20 (530 days ago) InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5) SourcePackage: nfs-utils UpgradeStatus: Upgraded to trusty on 2014-04-19 (15 days ago)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315974 Title: NFS v3 fstab option sec=sys results in RPC AUTH_NULL credentials instead of expected AUTH_UNIX To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nfs-utils/+bug/1315974/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
