NFS "mount system call failed"

[Rick Macklem]

Mark Owen wrote:
> Hi everyone,
> 
> I'm using FreeBSD 10.1 to share a ZFS pool (mounted at
> /media/storage)
> through NFS to Linux clients (Debian 7). I don't seem to get any
> errors
> when the nfs services start on FreeBSD but I can't mount the shares
> on
> the clients, all I get is: mount.nfs4: mount system call failed
> (Tried
> as NFSv3 and NFSv4, same result).
> 
> I'm really frustrated here since It worked barely an hour ago and I
> have absolutely no idea why I getting this error now.
> 
Well, here's a couple of comments:
1 - Look in /var/log/messages for any errors generated by mountd or nfsd
    on the FreeBSD server.
2 - Make sure the daemons (mountd and nfsd) are running, via "ps axHl".
3 - It appears you have exported the file system "read-only", but are
    trying to mount it read/write. (I'm not sure this would produce an
    error at mount time or just if/when the client tries to write to
    the file server?)
4 - If nothing above helps, use "tcpdump -s 0 -w xxx.pcap host <client.host>"
    on the server to capture packets during a mount attempt and then look at
    xxx.pcap in wireshark (since it understands NFS). This will show you what
    interaction is going on between client<->server and may give you the hint
    as to what is broken.

rick

> Anyway, here are my /etc/rc.conf and /etc/exports files from the
> server:
> 
> /etc/rc.conf
> 	...
> 	## ZFS
> 	zfs_enable="YES"
> 	## NFSv4 Server
> 	nfs_server_enable="YES"
> 	nfsv4_server_enable="YES"
> 	rpcbind_enable="YES"
> 	mountd_enable="YES"
> 	mountd_flags="-r"
> 	#rpc_lockd_enable="YES"
> 	#rpc_statd_enable="YES"
> 
> /etc/exports (I tried both as NFSv3 and NFSv4, here are the two
> options)
> -NFSv3:
> 	/media/storage/data -ro -alldirs -network 192.168.1.0 -mask
> 	255.255.255.0
> 
> -NFSv4:
> 	V4:/media/storage -network 192.168.1.0 -mask 255.255.255.0
> 	/media/storage/data -ro -alldirs -network 192.168.1.0 -mask
> 	255.255.255.0
> 
> 
> On the clients I use the following commands to try to mount the
> share:
> - NFSv3: mount -t nfs -o nolock server-ip:/media/storage/data
> /mnt/tmp
> - NFSv4: mount -t nfs4 server-ip:/data /mnt/tmp
> 
> Thank you for reading and I hope that someone will be able to help
> me.
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