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I have a machine that I need to bridge NFS files to. Can I mount an NFS directory on machine2 from machine1 and then mount the mounted NFS directory on machine2 on machine3 via NFS? Do you see any problems with that? I am basically bridging some subnet domains this way, in a certain fashion. My development machine is on a different and separate (unbridged) than where I would like to use the files, and I would like this machine1(dev machine) -> machine2(passthrough machine) -> machine3(test machine) connection. And no there is no way to move the test machine as it's a chassis :) and it's two buildings away.

5 Answers5

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You CAN re-export an NFS mount.

It is a really REALLY BAD IDEA™. If the first server's export fails, the second machine's export will suddenly lose its contents, and show an empty directory.

warren
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hrm. My kneejerk reaction is that it sounds like a bad idea, but I can't think of any technical reason that it wouldn't work.

So you're doing this because machine3 is unable to talk to machine1?

Matt Simmons
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I have tried this a long time ago and this does not work. I believe that this is some type of security issue as this could violate the restriction of hosts placed on the exported filesystem.

mdpc
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Last I looked (NFS v2,3) pass-through mounts like this are specifically disallowed by the NFS Protocol for security and performance reasons.

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You can not reexport an nfs mount over nfs. You could export the nfs mount via smb if that works for you.