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I have a large NFS share with a variety of software ISOs on it.

I've only tried this on Red Hat Enterprise Linux, but when trying to do the following, the mount comes back with an error indicating no permissions to mount. Why would this be happening?

NFS is mounted thusly:

mediaserver:path/to/isos /media/nfs

This is the mount call that fails

mount -o loop /media/nfs/product.iso /tmp/product

If I copy the ISO, there is no issue. The NFS share is mounted rw.

How can I loop mount the ISO from the NFS share without copying it first?

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up vote 5 down vote accepted

I don't think you can mount an ISO as read-write.

Try mounting the iso with -o loop,ro,noexec.

You can also modify the NFS /etc/exports as to add no_root_squash. For more info see here.

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thanks, harrymc - I knew it had to be simple :) – warren Sep 10 '10 at 13:59
How come the bounty for this hasn't been awarded? – imoatama Sep 15 '10 at 3:29
@imoatama - my guess is that it will auto-award at the end of the bounty period... but I don't know for sure – warren Sep 15 '10 at 13:28
Accept and Bounty are not holding hands any more. - If the bounty isn't manually awarded, only half is given at the end by the auto-bountifier. – random Sep 16 '10 at 21:25
@warren: Not your fault. The FAQ states accepting is only from the 2nd day. But it should either have stopped you from accepting, or awarded the full bounty. What happened is that you lost 50 reps, I got 25, and 25 simply evaporated. – harrymc Sep 17 '10 at 19:06

For the sake of presenting all alternatives for any future viewers the following works also:

mount -o loop -t iso9660 /media/nfs/product.iso /tmp/product

I've found it easier to remember to simply specify the filesystem, in this case ISO using the -t option.

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