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Accepted
Mike Purcell
Asked: 2015-12-25 07:45:34 +0800 CST

NFS4 - Mounting multiple subdirs

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I'm trying to setup 2 different mount points on an NFS4 server but can't get it working as desired.

/etc/exports (on server)

/mnt/raid/nas                   10.1.0.0/18(rw,fsid=0,sync)
/mnt/raid/nas/file/perm         10.1.0.0/18(rw,sync,all_squash,no_subtree_check,anonuid=501,anongid=503)
/mnt/raid/nas/mail              10.1.0.0/18(rw,sync,all_squash,no_subtree_check,anonuid=5555,anongid=5555)

With the above mount points, in theory I should be able to mount the subdirs, separately, like: 

$ -> mount -v -t nfs4 nas.vpc1.j1n.us:/mnt/raid/nas/file/perm /mnt/nas/store/file/perm/

But I keep getting these errors: ... failed, reason given by server: No such file or directory, but if I mount like this:

$ -> mount -v -t nfs4 nas.vpc1.j1n.us:/ /mnt/nas/

It works. But there are other dirs in the /mnt/raid/nas folder on the NFS server which I do not want to expose to NFS clients, so this option really doesn't help.

What can I do to use NFS4, but specify mount points so I don't end up sharing everything in /mnt/raid/nas?

linux

1 Answers

  1. Best Answer

    Figured out the problem. Because I set /mnt/nas as fsid=0, that means that clients mounting subdirectories no longer need to reference the entire path, only the child subdirs (relative pathing).

    Change this:

    $ -> mount -v -t nfs4 nas.vpc1.j1n.us:/mnt/raid/nas/file/perm /mnt/nas/store/file/perm/
$ -> mount -v -t nfs4 nas.vpc1.j1n.us:/mnt/raid/nas/mail /mnt/nas/mail/

    To this

    $ -> mount -v -t nfs4 nas.vpc1.j1n.us:/file/perm /mnt/nas/store/file/perm/
$ -> mount -v -t nfs4 nas.vpc1.j1n.us:/mail /mnt/nas/mail/

    Notice that in the 2nd set of commands the parent path /mnt/raid/nas is missing from the server:/path section of each command.

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