Re: file :"/var/lib/nfs/rmtab"

[James Pearson <james-p@moving-picture.com>]

'/etc/init.d/nfs stop' on Redhat/Fedora boxes kills mountd

What order does exportfs, nfsd and mountd get started or your system?

On my box it is:

exportfs
nfsd
mountd

However, if I run exportfs after mountd, then I get a stale NFS file handle

James Pearson

mehta kiran wrote:
> Hi James , 
>         I am working on suse box.(2.6 kernel).
>         You mounted nfsd filesystem and then
>         you ran a script /etc/init.d/nfs.
> 
>         Does this script starts and kills all nfs
>         daemons.? Can u verify whether it kills
>         mountd or not.?
>        
>         If mountd is not killed everthing works fine.
>         because it is mountd which reads rmtab.If it
>         is not restarted , it has all its data intact
>         and hence wont read rmtab.Thus , removing
>         entry from rmtab wont cause any problem.
> 
> thanks,
>   --kiran
> 
> 
> --- James Pearson <james-p@moving-picture.com> wrote:
> 
> 
>>What version of nfs-utils are you running?
>>
>>I've just tried (on a 2.6 kernel Fedora box):
>>
>>mount -t nfsd nfsd /proc/fs/nfsd
>>/etc/init.d/nfs start
>>
>>mount an exported file system on a client
>>
>>edit /var/lib/nfs/rmtab and removed the line
>>corresponding to the client
>>
>>/etc/init.d/nfs stop
>>/etc/init.d/nfs start
>>
>>Accessed the mount point on the client - no stale
>>handle ...
>>
>>... and the deleted line 'magically' reappears in
>>/var/lib/nfs/rmtab
>>
>>James Pearson
>>
>>mehta kiran wrote:
>>
>>>hi James , 
>>>        it did not help.
>>>        Enmtry in rmtab file is still used.
>>>thanks for ur reply,
>>>      kiran
>>>
>>>--- James Pearson <james-p@moving-picture.com>
>>
>>wrote:
>>
>>>
>>>>Did you do 'mount -t nfsd nfsd /proc/fs/nfsd'
>>
>>before
>>
>>>>starting all the 
>>>>nfs daemons?
>>>>
>>>>James Pearson
>>>>
>>>>mehta kiran wrote:
>>>>
>>>>
>>>>>I am using 2.6 kernel
>>>>>--- mehta kiran <kiranmehta1981@yahoo.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Hi , 
>>>>>>       if handle supplied by client is
>>>>
>>>>sufficient
>>>>
>>>>
>>>>>>,
>>>>>>then why does the problem given below exists.
>>>>>>
>>>>>>1. export filesystem to client.
>>>>>>2. let client allow to mount it.
>>>>>>3. remove all entries from rmtab on server.
>>>>>>4. restart all nfs daemons.
>>>>>>5. Now if client access filesystem , it gets
>>>>>> permission denied error.Client can access
>>>>>> filesystem only after remounting it.
>>>>>>6. This show that mountd still uses rmtab to
>>>>>> check if client had mounted filesystem or not.
>>>>>> No entry in rmtab for a client means it has
>>
>>not
>>
>>>>>> mounted filesystem.
>>>>>>
>>>>>>thanks,
>>>>>>--kiran
>>>>>>
>>>>>>--- Paul Clements <paul.clements@steeleye.com>
>>>>>>wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>>mehta kiran wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Isn't handle supplied by client
>>>>>>>>        enough to verify clients access to
>>>>>>>>        filesystem.?
>>>>>>>
>>>>>>>Yes, it should be. That's why in 2.6, the rmtab
>>>>>>
>>>>>>file
>>>>>>
>>>>>>
>>>>>>
>>>>>>>is no longer relied 
>>>>>>>upon. Instead, there is a special filesystem,
>>>>>>>/proc/fs/nfsd, that allows 
>>>>>>>the kernel to communicate with mountd in order
>>
>>to
>>
>>>>>>>authenticate 
>>>>>>>unrecognized clients automatically.
>>>>>>>
>>>>>>>--
>>>>>>>Paul
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
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