On 3/29/19 12:56 PM, James Pearson wrote:

Frank Thommen wrote:

...

I would like to use the NFSv4 ability to create a "root" filesystem with fsid=0, so that I don't have to refer to the whole path of the exported filesystem when I mount it.  However I do *not* want this root filesystem to be mountable by any host.  Is that possible and how?

E.g Filesystem:   /exports/data1   /exports/data2   /exports/data3

/etc/exports:   /exports         *(ro,no_subtree_check,fsid=0)   /exports/data1   host1(rw)   /exports/data2   host1(rw)   /exports/data3   host2(rw)

host1 and host2 can mount fileserver:/ and access any of the dataN directories at least read-only.  That is unwanted.  I'd like /exports/data1 and /exports/data2 to be exclusively accessible by host1 and /exports/data3 by host2.  But I'd still like to be able to mount e.f. as fileserver:/data1 instead of fileserver:/exports/data1.

I've search around a lot and I have found the question several times, but no solution yet.

It appears to work for me ... host1 will still see data3 under the mount point - but its contents will be empty - similarly, host2 will see data1 and data2 under the mount point, but their contents will be empty

Or have I missed something ?

James Pearson

[better late then never...]

You haven't missed anything and /we/ made a mistake: We hadn't realized, that "fsid" relates to "real" filesystems and not just directories. We had this

/storage /exports none bind 0 0

in /etc/fstab, which made all individual shares (subdirectories of /storage) members of the same fsid and hence they had the same export settings applied. After changing the bind mounts to

/storage/data1 /exports/data1 none bind 0 0 /storage/data2 /exports/data2 none bind 0 0

all exports now work as expected.

Cheers frank