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ajdecon
Asked: 2011-03-17 15:22:09 +0800 CST

NFS denies mount, even though the client is listed in exports

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We have a couple of servers (part of an HPC cluster) in which we're currently seeing some NFS behavior which is not making sense to me. node1 exports its /lscratch directory via NFS to node2, mounted at /scratch/node1. node2 also exports its own lscratch, which is correspondingly mounted at /scratch/node2 on node1.

Unfortunately, whenever I attempt to mount either NFS export on the opposite node, I get the following error:

mount: node1:/lscratch failed, reason given by server: Permission denied

This despite the fact that I have included first the IP range (10.6.0.0) and then the specific IPs (10.6.7.1, 10.6.7.2) in /etc/exports.

Any suggestions?

Edit to remove ambiguity: I've made sure that exports only contains either the range, or the specific IPs, not both at the same time.

nfs permissions hpc

2 Answers

  1. A couple (perhaps silly) questions:

    What's the export line?

    What user is trying to mount the export?

    root may not be allowed to mount...check into no root squash if this turns out to be the case.

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    1. try putting the client's IP address in /etc/hosts.allow (tcp wrappers, see man page)

    2. from the client try telnet SERVER-IP 2049.... until that works, (for opening a connection) the mount won't work. (assuming default recent linux nfs setup,i.e. tcp also or only).

    3. between making any changes like above, tell the nfs server about the changes with:

    sudo exportfs -v -a

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