NFS problems

NFS problems

[Yves Dorfsman]

I built my virtual machines on KVM version 28 back in july. One of them 
runs gentoo x86_64 (as guest) and a small web server with apache 2, 
serving pages from an NFS directory. Never had a problem with it.

This week I upgraded KVM to version 57. Everything looked like it worked, 
but I run into the following problem: after serving a few pages (< 20) the 
machine gets into 0% user, 0% idle 100% wait and apache stop serving any 
page. I can kill most apache processes except two. "ls" and "df" on the 
nfs filesystem still works. I reboot the virtual box and try to run 
"emerge" (gentoo package management) that uses NFS heavily, and it hangs, 
and the machine is the state describe above.

Shutting down the virtual box and replacing kvm v57 by kvm v28 fixes the 
problem.

Anybody run into a comparable problem ?

Thanks.


Yves.
----
Yves Dorfsman                                             yves-Qq95MN99UUsAvxtiuMwx3w@public.gmane.org
                                                    http://www.SollerS.ca


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Re: NFS problems

[Avi Kivity]

Yves Dorfsman wrote:
> I built my virtual machines on KVM version 28 back in july. One of them 
> runs gentoo x86_64 (as guest) and a small web server with apache 2, 
> serving pages from an NFS directory. Never had a problem with it.
>
> This week I upgraded KVM to version 57. Everything looked like it worked, 
> but I run into the following problem: after serving a few pages (< 20) the 
> machine gets into 0% user, 0% idle 100% wait and apache stop serving any 
> page. I can kill most apache processes except two. "ls" and "df" on the 
> nfs filesystem still works. I reboot the virtual box and try to run 
> "emerge" (gentoo package management) that uses NFS heavily, and it hangs, 
> and the machine is the state describe above.
>
> Shutting down the virtual box and replacing kvm v57 by kvm v28 fixes the 
> problem.
>
> Anybody run into a comparable problem ?
>   

What virtual nic are you using?  ne2k is broken; try rtl8139 (which 
gives better performance anyway).

-- 
error compiling committee.c: too many arguments to function


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Re: NFS problems

[Yves Dorfsman]

On Wed, 26 Dec 2007, Avi Kivity wrote:

> Yves Dorfsman wrote:
>>
>>  This week I upgraded KVM to version 57. Everything looked like it worked,
>>  but I run into the following problem: after serving a few pages (< 20) the
>>  machine gets into 0% user, 0% idle 100% wait and apache stop serving any
>>  page. I can kill most apache processes except two. "ls" and "df" on the

> What virtual nic are you using?  ne2k is broken; try rtl8139 (which gives 
> better performance anyway).

I was usign rtl8020 (I think), anyway, not ne2k. I am now using rtl8139 
and have the same problem. I am using the linux 8139too though, which I 
understand is old, I am trying to replace it with the newer one 8139cp, 
but have shoot myself in the foot by doing so on one of my vm :-)

Anyway, same nfs issue with 8139cp and kvm 58.


Yves.


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Re: NFS problems

[Yves Dorfsman]

On Wed, 26 Dec 2007, Yves Dorfsman wrote:

> I was usign rtl8020 (I think), anyway, not ne2k. I am now using rtl8139 and 
> have the same problem. I am using the linux 8139too though, which I 
> understand is old, I am trying to replace it with the newer one 8139cp, but 
> have shoot myself in the foot by doing so on one of my vm :-)
>
> Anyway, same nfs issue with 8139cp and kvm 58.

Sorry I meant 8139too.

I got my vm back up, and added 8139cp (had to select experimental driver), 
and nfs is working fine with kvm 58. I'm not sure what the usual (*buntu, 
fedorea, etc...) distros ship with, but I suspect 8139too, so it might be 
a good idea to add this one to the FAQ.


Thanks.

Yves.
----
Yves Dorfsman                                             yves-Qq95MN99UUsAvxtiuMwx3w@public.gmane.org
                                                    http://www.SollerS.ca


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NFS problems..

[Anders Widman]

   Hello!

   Running  RedHat  7.3  I  am  trying  to  use NFS to export root. It
   doesn't  work.  Exporting any subfolder works... This is my exports
   file:

       /usr/src/       192.168.0.100(rw,no_root_squash,insecure)
       /               192.168.0.100(rw,no_root_squash,insecure)

   When using "exportfs -a" I get an error:

       192.168.0.100:/: Invalid argument

   Then, when I am trying to mount from the client:

       mount -tnfs 192.168.0.101:/mnt/root/ /mnt/server/
       mount: 192.168.0.101:/mnt/root/ failed, reason given by server: Permission denied

   And the server syslog contains this:

       rpc.mountd: authenticated mount request from 192.168.0.100:752 for / (/)
       rpc.mountd: getfh failed: Operation not permitted
   
   What am I doing wrong?

    - Anders      



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Re: NFS problems..

[Bernd Schubert]

Hi,

I'm afraid exporting subfolders of an already exported directory doesn't work, 
and so it doesn't when you try to export vice versa.

Regards, Bernd

On Tuesday 03 September 2002 18:01, Anders Widman wrote:
>    Hello!
>
>    Running  RedHat  7.3  I  am  trying  to  use NFS to export root. It
>    doesn't  work.  Exporting any subfolder works... This is my exports
>    file:
>
>        /usr/src/       192.168.0.100(rw,no_root_squash,insecure)
>        /               192.168.0.100(rw,no_root_squash,insecure)
>
>    When using "exportfs -a" I get an error:
>
>        192.168.0.100:/: Invalid argument
>
>    Then, when I am trying to mount from the client:
>
>        mount -tnfs 192.168.0.101:/mnt/root/ /mnt/server/
>        mount: 192.168.0.101:/mnt/root/ failed, reason given by server:
> Permission denied
>
>    And the server syslog contains this:
>
>        rpc.mountd: authenticated mount request from 192.168.0.100:752 for /
> (/) rpc.mountd: getfh failed: Operation not permitted
>
>    What am I doing wrong?
>
>     - Anders
>
>
>
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-- 
Bernd Schubert
Physikalisch Chemisches Institut
Abt. Theoretische Chemie
INF 229, 69120 Heidelberg
Tel.: 06221/54-5210
e-mail: 	bernd (dot) schubert (at) pci (dot) uni-heidelberg (dot) de 


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Re: NFS problems..

[Anders Widman]

> Hi,

> I'm afraid exporting subfolders of an already exported directory doesn't work, 
> and so it doesn't when you try to export vice versa.

I  read  that  also.. but only exporting / (root) doesn't work either.
That is my real problem.

//Anders

> Regards, Bernd

> On Tuesday 03 September 2002 18:01, Anders Widman wrote:
>>    Hello!
>>
>>    Running  RedHat  7.3  I  am  trying  to  use NFS to export root. It
>>    doesn't  work.  Exporting any subfolder works... This is my exports
>>    file:
>>
>>        /usr/src/       192.168.0.100(rw,no_root_squash,insecure)
>>        /               192.168.0.100(rw,no_root_squash,insecure)
>>
>>    When using "exportfs -a" I get an error:
>>
>>        192.168.0.100:/: Invalid argument
>>
>>    Then, when I am trying to mount from the client:
>>
>>        mount -tnfs 192.168.0.101:/mnt/root/ /mnt/server/
>>        mount: 192.168.0.101:/mnt/root/ failed, reason given by server:
>> Permission denied
>>
>>    And the server syslog contains this:
>>
>>        rpc.mountd: authenticated mount request from 192.168.0.100:752 for /
>> (/) rpc.mountd: getfh failed: Operation not permitted
>>
>>    What am I doing wrong?
>>
>>     - Anders
>>
>>
>>
>> -------------------------------------------------------
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>> cell phone?  Get a new here for FREE!
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Re: NFS problems..

[Bernd Schubert]

On Tuesday 03 September 2002 18:33, Anders Widman wrote:
> > Hi,
> >
> > I'm afraid exporting subfolders of an already exported directory doesn't
> > work, and so it doesn't when you try to export vice versa.
>
> I  read  that  also.. but only exporting / (root) doesn't work either.
> That is my real problem.
>
> //Anders
>

Ah, now I understand. 

> /                192.168.0.100(rw,no_root_squash,insecure)

Is '/' perhaps already an imported directory? 


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Re: NFS problems..

[Anders Widman]

> On Tuesday 03 September 2002 18:33, Anders Widman wrote:
>> > Hi,
>> >
>> > I'm afraid exporting subfolders of an already exported directory doesn't
>> > work, and so it doesn't when you try to export vice versa.
>>
>> I  read  that  also.. but only exporting / (root) doesn't work either.
>> That is my real problem.
>>
>> //Anders
>>

> Ah, now I understand. 

>> /                192.168.0.100(rw,no_root_squash,insecure)

> Is '/' perhaps already an imported directory? 


What  do  you  mean by "imported directory".. This is my FSTAB file on
the server:

/dev/hde2       /                      reiserfs defaults        1 1
/dev/hde1       /boot                  ext3     defaults        1 2
none            /dev/pts               devpts   gid=5,mode=620  0 0
none            /proc                  proc     defaults        0 0
none            /dev/shm               tmpfs    defaults        0 0
/dev/hde3       swap                   swap     defaults        0 0



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Re: NFS problems..

[Bernd Schubert]

On Tuesday 03 September 2002 21:11, Anders Widman wrote:
> > On Tuesday 03 September 2002 18:33, Anders Widman wrote:
> >> > Hi,
> >> >
> >> > I'm afraid exporting subfolders of an already exported directory
> >> > doesn't work, and so it doesn't when you try to export vice versa.
> >>
> >> I  read  that  also.. but only exporting / (root) doesn't work either.
> >> That is my real problem.
> >>
> >> //Anders
> >
> > Ah, now I understand.
> >
> >> /                192.168.0.100(rw,no_root_squash,insecure)
> >
> > Is '/' perhaps already an imported directory?
>
> What  do  you  mean by "imported directory".. This is my FSTAB file on
> the server:

I meant imported e.g. via nfs.

>
> /dev/hde2       /                      reiserfs defaults        1 1
> /dev/hde1       /boot                  ext3     defaults        1 2
> none            /dev/pts               devpts   gid=5,mode=620  0 0
> none            /proc                  proc     defaults        0 0
> none            /dev/shm               tmpfs    defaults        0 0
> /dev/hde3       swap                   swap     defaults        0 0
>

Hmm, very strange, I can reproduce your error message on our clients, where / 
is imported via nfs, but the server exports its / and I can't get this 
message there.

Sorry but now I'm out of ideas.




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