How to specify owner and permissions for an NFS mount

fstabgroupmountnfspermissions

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.

Best Answer

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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User permissions in NFS mounted directory

NFS checks access permissions against user ids (UIDs). The UID of the user on your local machine needs to match the UID of the owner of the files you are trying to access on the server.

I would suggest to go to the server and look at the file permissions. Which UID (find out with id username) do they belong to and which permissions are set?

And if you are the only one accessing the files on the server, you can make the server pretend that all request come from the proper UID. For that, NFS has the option all_squash. It tells the server to map all request to the anonymous user, specified by anonuid,anongid.

Add these options: all_squash,anonuid=1026,anongid=100 to the export in /etc/exports.

Be warned though, that this will make anyone mounting the export effectively the owner of those files.

Nfs mount failed: reason given by server: No such file or directory

Does not apply to NFSv4:

Why did you not include the folder before /backup/?

It should be :
server:/export/backup/system/pc1 /backup/system nfs4 auto,noatime        0 0
You need to mount it according to your export file.

Edit :

Could it be that you are exporting the file pc1 only to the IP address 192.168.1.8 and your client does not have that IP.

Try changing the IP address :

/export/backup/system/pc1 192.168.1.0/24(rw,sync,no_root_squash,no_subtree_check)

Best Answer

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User permissions in NFS mounted directory

Nfs mount failed: reason given by server: No such file or directory

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