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I have an NFS mount in fstab:

10.0.12.10:/share1    /net/share1    nfs    rw    0    0

which defaults to root as owner and group and 777 permissions. How do I specify another owner and different permissions? I can use chown and chmod, but it certainly should be possible straight from the mount command?

The system OS is Ubuntu Server 14.04.

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It isn't possible from the mount command, because mount has to handle a variety of different filesystem types - including ones that might not support 'classic' ugo unix style permissions.

You are "stuck with" chown/chgrp/chmod. (Where applicable).

Bear in mind the server has permissions on its own filesystem. It may well be doing some manner of mapping - more commonly you'll see root -> nobody, but NFSv4 and idmap opens a whole new can of worms there. (It doesn't apply direct uid/gid ownership, but rather maps userids against a common directory.)

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