permission denied under load

permission denied under load

[Michael Haverkamp]

I have a system running Gentoo Linux with a 2.6.9 kernel that is acting 
as an NFS server for several Solaris 7,8,9 systems.  Everything appears 
to work fine for a while, but at seemingly random times the clients get 
"Permission denied" when trying to access a file or directory that they 
are normally able to access.  This problem may persist for a few 
minutes, but then everything returns to normal again.  This happens 
multiple times a day.

I believe that the problem is more likely to occur under when the server 
is under a heavy load.  By intentionally stressing the nfs server, I can 
usually cause the problem to happen.  Also, the problem occurs to all 
clients at the same time when it occurs.

Does anyone know what might be causing my problem or know what can be 
done about it?


-- 
Michael Haverkamp


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Re: permission denied under load

[Jan Kasprzak]

Michael Haverkamp wrote:
: I have a system running Gentoo Linux with a 2.6.9 kernel that is acting 
: as an NFS server for several Solaris 7,8,9 systems.  Everything appears 
: to work fine for a while, but at seemingly random times the clients get 
: "Permission denied" when trying to access a file or directory that they 
: are normally able to access.  This problem may persist for a few 
: minutes, but then everything returns to normal again.  This happens 
: multiple times a day.
: 
	See the list archive from the last week or so - I think this
is an "out of privileged ports" problem. Does by any chance the server
(rpc.mountd in particular) complain about unprivileged ports?

-Yenya

-- 
| Jan "Yenya" Kasprzak  <kas at {fi.muni.cz - work | yenya.net - private}> |
| GPG: ID 1024/D3498839      Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E |
| http://www.fi.muni.cz/~kas/   Czech Linux Homepage: http://www.linux.cz/ |
> Whatever the Java applications and desktop dances may lead to, Unix will <
> still be pushing the packets around for a quite a while.      --Rob Pike <


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Re: permission denied under load

[Michael Haverkamp]

There is nothing in the logs about privileged ports or unprivileged ports.

Also, in case I wasn't clear in my first email, the problem happens to 
clients that already have the filesystem mounted.  Does that mean that 
mountd is no longer involved?

Example:

$ mount | grep fmt
/usr/fmt on nfs:/usr/fmt remote/read 
only/setuid/bg/timeo=200/proto=udp/xattr/dev=46400fd on Thu Nov 11 
05:13:15 2004
$ ls -ld /usr/fmt/coreutils
ls: /usr/fmt/coreutils: Permission denied
$

Wait a while

$ ls -ld /usr/fmt/coreutils
drwxr-xr-x    6 root     root          144 May  7  2003 /usr/fmt/coreutils


Jan Kasprzak wrote:
> Michael Haverkamp wrote:
> : I have a system running Gentoo Linux with a 2.6.9 kernel that is acting 
> : as an NFS server for several Solaris 7,8,9 systems.  Everything appears 
> : to work fine for a while, but at seemingly random times the clients get 
> : "Permission denied" when trying to access a file or directory that they 
> : are normally able to access.  This problem may persist for a few 
> : minutes, but then everything returns to normal again.  This happens 
> : multiple times a day.
> : 
> 	See the list archive from the last week or so - I think this
> is an "out of privileged ports" problem. Does by any chance the server
> (rpc.mountd in particular) complain about unprivileged ports?
> 
> -Yenya
> 

-- 
Michael Haverkamp


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