Hi, Phil,
Thank you very much for your help. I have retried the procedure according to
your comments. I do find "authenticated mount request from ***" message even
when nfs failed. Does it mean that it is caused by the server problem? The EVM
I use is DM6467EVM.
I will try to trace NFS to see what happen when NFS fails. Thanks a lot.
Regards,
Peng
--- 08年12月17日，周三, Phil Quiney <[email protected]> 写道：
发件人: Phil Quiney <[email protected]>
主题: Re: nfs mount problem
收件人: [email protected]
抄送: [email protected]
日期: 2008,1217,周三,8:59下午
Hi,
Looking at the log doesn't show any reason for the failure. I am a little
confused by the 'Caught signal 15' lines as this suggests to me that
something is restarting the NFS server. I assume this is your doing rather than
something happening on the server?
I would try restarting the target at a known time and check that there is a
corresponding "authenticated mount request" in the server log. If the
NFS boot fails and there is an "authenticated mount request" then it
could be server related. If the "authenticated mount request" does not
appear then the server never saw the target. I would suspect the DM355 ethernet
problem as the cause here - that is the link failed to come up so the NFS mount
will fail from the target's point of view (and also the reason why the
server never saw anything).
It may be worth installing wireshark on the server and tracing the NFS
connection. This does assume your server has GUI capability - you can always
resort to 'tcpdump' if not.
Regards
Phil Q
peng zhu wrote:
> Hi, Phil,
> Thank you very much for your kind help. My nfs mount sometimes work and
sometimes fail.
> The error log message is as the following. Could you help me analyse what
is the problem? Thank you very much for your help.
> Dec 8 11:25:31 localhost syslogd 1.4.1: restart.
> Dec 8 12:02:04 localhost xinetd[3063]: START: tftp pid=14278
from=192.168.1.234
> Dec 8 12:02:31 localhost mountd[3148]: authenticated mount request from
192.168.1.234:800 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:03:11 localhost last message repeated 2 times
> Dec 8 12:15:36 localhost mountd[3148]: authenticated mount request from
192.168.1.234:821 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:16:16 localhost last message repeated 2 times
> Dec 8 12:17:36 localhost last message repeated 4 times
> Dec 8 12:21:47 localhost mountd[3148]: authenticated mount request from
192.168.1.234:826 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:21:51 localhost mountd[3148]: Caught signal 15, un-registering
and exiting.
> Dec 8 12:21:52 localhost kernel: nfsd: last server has exited
> Dec 8 12:21:52 localhost kernel: nfsd: unexporting all filesystems
> Dec 8 12:21:53 localhost kernel: NFSD: Using /var/lib/nfs/v4recovery as
the NFSv4 state recovery directory
> Dec 8 12:21:53 localhost kernel: NFSD: starting 90-second grace period
> Dec 8 12:22:16 localhost mountd[14959]: authenticated mount request from
192.168.1.234:827 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:22:56 localhost last message repeated 2 times
> Dec 8 12:24:16 localhost last message repeated 4 times
> Dec 8 12:25:04 localhost mountd[14959]: authenticated mount request from
192.168.1.234:829 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:25:44 localhost last message repeated 2 times
> Dec 8 12:26:04 localhost mountd[14959]: authenticated mount request from
192.168.1.234:829 for /home/hitachi/workdir/filesys
(/home/hitachi/workdir/filesys)
> Dec 8 12:26:18 localhost mountd[14959]: Caught signal 15, un-registering
and exiting.
> Dec 8 12:26:18 localhost kernel: nfsd: last server has exited
> Dec 8 12:26:18 localhost kernel: nfsd: unexporting all filesystems
> Dec 8 12:26:18 localhost kernel: RPC: failed to contact portmap (errno
-5).
> Dec 8 12:26:19 localhost kernel: NFSD: Using /var/lib/nfs/v4recovery as
the NFSv4 state recovery directory
> Best regards,
> Peng
>
>
> --- *08年12月10日，周三, Phil Quiney
/<[email protected]>/* 写道：
>
> 发件人: Phil Quiney <[email protected]>
> 主题: Re: nfs mount problem
> 收件人: [email protected]
> 抄送: [email protected]
> 日期: 2008,1210,周三,10:02下午
>
> Hi,
>
> Check the NFS server log file (/var/log/messages) to find out what is
going on.
> This should have an entry each time the mount request is seen by the
server - it
> should say something like 'Authenticated mount request for.....'.
If it
> fails to authenticate it should give a reason..
>
> Failing that can you try swapping network cables just in case you have a
faulty
> one. The error (-5) is EIO which you could take to indicate a problem in
the
> data transfer - although you may get the same error if the NFS server
denies the
> mount request (from the NFS client's point of view).
>
> Can you also check that the NFS server has no firewall. A quick
'iptables
> -L'
>
> Chain INPUT (policy ACCEPT)
> target prot opt source destination
>
> Chain FORWARD (policy ACCEPT)
> target prot opt source destination
>
> Chain OUTPUT (policy ACCEPT)
> target prot opt source destination
>
> The above is the output on my machine - there are no rules.
>
> Also make sure that the NFS server itself is not shifting IP addresses via
> DHCP. It is 'tradition' to make servers have static IP addresses,
either
> by setting them as a static on the server itself or getting the DHCP
server to
> issue a static address (based on the server MAC address).
>
> Finally check permissions on /home/**** (the target root file system
should all
> be owned by root except for files under rootfs/home). Also confirm that
> /etc/exports has 'no_root_squash' for the export. This will allow
any
> files written by the target as root to maintain the permissions on the NFS
> server (rather than being written as 'nobody' or whatever).
>
> Regards
>
> Phil Q
>
> peng zhu wrote:
>
>> Hi. I am a user of DM6467 EVM.
>> When booting the board, I make the board mount the nfs system in one
> Linux host PC. Sometimes it succeeds, but sometimes it fails. The error
msg is
> like this:
>> mount: server ******** not responding, timed out
>> Root-NFS: Server returned error -5 while mounting /home/*******
>> *********************
>> Could you tell me what's the problem and how to solve it? Thank
you
> very much.
>> Best regards,
>> Peng
>>
>>
>>
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