Thursday, February 3, 2011

mount multiple folders with nfs4 on centos

I'm trying to get nfs4 working here.

Machine 1 (server) I have a folder and in it 2 other folders I'm trying to share independently. /shared/folder1 /shared/folder2

Problem is, I can't seem to figure out how to mount the folders independently on the client.

(Machine 1 - server) /etc/exports:

/var/shared/folder1 192.168.200.101(rw,fsid=0,sync)
/var/shared/folder2 192.168.200.101(rw,fsid=0,sync)

...

exportfs -ra

...

exportfs

/var/shared/folder1
                   192.168.200.101
/var/shared/folder2
                   192.168.200.101

(Machine 2 - client) /etc/fstab:

192.168.200.201:/folder1/ /home/nfsmnt/folder1 nfs4 rw 0 0

...

mount /home/nfsmnt/folder1
mount.nfs4: 192.168.200.201:/folder1/ failed, reason given by server: No such file or directory

The folder is there. I'm positive. I think there is something simple I'm missing, but I'm totally missing it.

It seems like there should be a way in fstab to tell nfs which folder on the server I want to mount. But I can only find references to what looks like a root mount point (e.g. 192.168.1.1:/) which I assume is handled by exports on the server. But even with the folders set up in exports, there doesn't seem to be an apparent way to pich and choose which gets mounted.

Is it not possible to mount separate folders from the same server to different mount points on the client?

Any help appreciated.


edit:

The error log on the server is showing the following:

/var/shared/folder1 and /var/shared/folder2 have same filehandle for 192.168.200.101, using first

Not sure what that means or how to change it. Googling only seems ti bring up info about nfs security.

  • in /etc/fstab, either of the 2 syntaxes should do

    192.168.200.201:/var/shared/folder1 /home/nfsmnt/folder1 nfs4 rw,defaults 0 0 192.168.200.201:/var/shared/folder1 /home/nfsmnt/folder1 nfs rw,nfsvers=4,defaults 0 0

    microchasm : I still get a folder not found error.`mount.nfs4: 192.168.200.201:/var/shared/folder1 failed, reason given by server: No such file or directory` Also get: `'vers=4' is not supported. Use '-t nfs4' instead.` Thanks!
    Jmarki : apologies, mixed up with the Solaris command. `vers=4` should be nfsvers=4.
    Jmarki : I think you should not have `fsid=0` in your `/etc/exports` lines. Both folders are forced to be the same export handler, causing the `same filehandler` error log. See `man exports` for details on `fsid`
    microchasm : Nope. I tried both changing each line of exports to fsid=1, fsid=2 respectively and fsid=0, fsid=1 respectively and I get Operation not permitted errors.
    From Jmarki
  • In order to share the subdirectories, I had to share the parent folder first with fsid=0. So on the server /etc/exports looks like this:

    /var/shared 192.168.200.101(rw,fsid=0,sync)
    /var/shared/folder1 192.168.200.101(rw,sync)
    /var/shared/folder2 192.168.200.101(rw,sync)
    

    then on the client /etc/fstab looks like:

    192.168.200.201:/folder1 /home/nfsmnt/folder1 nfs4 rw 0 0
    192.168.200.201:/folder2 /home/nfsmnt/folder2 nfs4 rw 0 0
    

    I can then mount the folders as expected:

    mount /home/nfsmnt/folder1
    
    From microchasm

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