Hi,
On a Debian server I have mounted several snapshots daily that I export
with NFS.
At the end of the day the nfs-kernel-server service is shut down, the
snapshots are renewed, remounted, and the server is brought online
again.
In the beginning (I haven't been doing this for long) it all worked fine
and I could mount the shares on the client, which is an older NAS unit,
running an old kernel as 2.6.32.
Yet one of the shares now refuses to get mounted and I don't know why.
The only thing I haven't tried is actually renaming the mount points.
mount: mounting island.vpn:/srv/root on /mnt/remote/root failed: Stale
NFS file handle
This "island.vpn" simply translates to 10.8.20.25, in this case.
This is one of 5 mounts and one of 5 snapshots. The other snapshots
simply succeed.
I have rebooted both servers.
I have removed the mount points on both places: the mount points for the
snapshots, and the mount points for the shares on the client.
I have run exportfs -r and exportfs -f.
Oh, apologies, I see the issue, or at least part of it.
Dec 24 02:45:35 island rpc.mountd[3217]: / and /srv/root have same
filehandle for diskstation.vpn, using first
I really wanted to find out if it uses nfs3 or nfs4, but I think it uses
nfs 4.
The above message does not always repeat itself:
Dec 24 02:56:35 island rpc.mountd[3217]: authenticated mount request
from 10.8.20.1:944 for /srv/root (/srv/root)
Dec 24 02:58:09 island rpc.mountd[3217]: authenticated mount request
from 10.8.20.1:638 for /srv/boot (/srv/boot)
The site uses LVM snapshots, root (and boot) are regular, non-thin
snapshots.
These are my exports:
/srv/home diskstation(ro,no_subtree_check,no_root_squash)
/srv/data diskstation(ro,no_subtree_check,no_root_squash)
/srv/sites diskstation(ro,no_subtree_check,no_root_squash)
/srv/boot diskstation(ro,no_subtree_check,no_root_squash)
/srv/root diskstation(ro,no_subtree_check,no_root_squash)
All other mounts succeed without issue. Root did fine at first as well.
Edit: adding fsid=22 to the root line fixed it:
/srv/home diskstation(ro,no_subtree_check,no_root_squash)
/srv/data diskstation(ro,no_subtree_check,no_root_squash)
/srv/sites diskstation(ro,no_subtree_check,no_root_squash)
/srv/boot diskstation(ro,no_subtree_check,no_root_squash)
/srv/root diskstation(ro,fsid=22,no_subtree_check,no_root_squash)
All snapshots are independently mounted and hence do not contain other
mounts on them.
Well I'm glad that's sorted. I don't know why the NFS server would pick
a filesystem to export that wasn't even mentioned. Of course the
snapshot and the root (original) will have the same UUID.
Not its partition, but its filesystem will.
So I apologize for this message ;-).
Regards.
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