[gentoo-user] nfs error: "permission denied" when executing a command

[gentoo-user] nfs error: "permission denied" when executing a command

[Marco Calviani]

Hi,
  i have a problem with NFS. A partition mounted on machine gentoo1 is
correctly exported and mounted in gentoo2 (that is, it is possible to
read and write on it). However whenever i try to execute a program
from gentoo2 that it is stored on the exports of gentoo1, i get the
"Permission denied" error. What can be the cause of this?

This is my /etc/exports located on gentoo1.

/pippo0  gentoo1(sync,no_subtree_check,rw)
/pippo1  gentoo1(sync,no_subtree_check,rw)

and this is the gentoo2 /etc/fstab relevant part:

gentoo1:/pippo0  /pippo0    nfs          rw,user,auto            0    0
gentoo1:/pippo1  /pippo1    nfs          rw,user,auto            0    0

Any help would be appreciated,
thanks in advance,
marco
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Re: [gentoo-user] nfs error: "permission denied" when executing a command

[Glenn Sieb]

Marco Calviani wrote:
> Hi,
>  i have a problem with NFS. A partition mounted on machine gentoo1 is
> correctly exported and mounted in gentoo2 (that is, it is possible to
> read and write on it). However whenever i try to execute a program
> from gentoo2 that it is stored on the exports of gentoo1, i get the
> "Permission denied" error. What can be the cause of this?
>
> This is my /etc/exports located on gentoo1.
>
> /pippo0  gentoo1(sync,no_subtree_check,rw)
> /pippo1  gentoo1(sync,no_subtree_check,rw)
>
> and this is the gentoo2 /etc/fstab relevant part:
>
> gentoo1:/pippo0  /pippo0    nfs          rw,user,auto            0    0
> gentoo1:/pippo1  /pippo1    nfs          rw,user,auto            0    0

First, obvious questions: Have you checked to make sure your PATH is set
correctly, or are you giving the full path to the executable? Do you
actually have the authority to run the program in question?

Another gotcha could be: Are you trying to run a program that needs to
be run as root? NFS won't let you do many rootly things over NFS unless
you add a no_root_squash to the share options in /etc/exports.

Anywho.. I hope that helps, if not solve your problem, get you on the
right track.. :)

Best,
--Glenn

-- 
Glenn E. Sieb
MTS - Software Applications Specialist
Yangtze Project, ALV
+1 732 949 5453
sieb@bell-labs.com

Don't forget System Administrator Day! July 27, 2007!
http://www.sysadminday.com/

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Re: [gentoo-user] nfs error: "permission denied" when executing a command

[James Ausmus]

On 7/18/07, Marco Calviani <marco.calviani@gmail.com> wrote:
> Hi,
>   i have a problem with NFS. A partition mounted on machine gentoo1 is
> correctly exported and mounted in gentoo2 (that is, it is possible to
> read and write on it). However whenever i try to execute a program
> from gentoo2 that it is stored on the exports of gentoo1, i get the
> "Permission denied" error. What can be the cause of this?
>
> This is my /etc/exports located on gentoo1.
>
> /pippo0  gentoo1(sync,no_subtree_check,rw)
> /pippo1  gentoo1(sync,no_subtree_check,rw)
>
> and this is the gentoo2 /etc/fstab relevant part:
>
> gentoo1:/pippo0  /pippo0    nfs          rw,user,auto            0    0
> gentoo1:/pippo1  /pippo1    nfs          rw,user,auto            0    0

man mount
/user
gets you (*'s added by me for easy find):

user   Allow an ordinary user to mount the file system.  The
                     name of the mounting user is written to mtab so that he
                     can unmount the file system again.  ****This option implies
                     the options noexec****, nosuid, and nodev (unless
overridden
                     by subsequent options, as in the option line
                     user,exec,dev,suid)

So, short answer, add "exec" to your mount options...


HTH-

James



>
> Any help would be appreciated,
> thanks in advance,
> marco
> --
> gentoo-user@gentoo.org mailing list
>
>
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Re: [gentoo-user] nfs error: "permission denied" when executing a command

[Marco Calviani]

Hi James and the others,
   thank you very much, this option made the trick.

Regards,
marco

On 7/19/07, James Ausmus <james.ausmus@gmail.com> wrote:

> man mount
> /user
> gets you (*'s added by me for easy find):
>
> user   Allow an ordinary user to mount the file system.  The
>                      name of the mounting user is written to mtab so that he
>                      can unmount the file system again.  ****This option implies
>                      the options noexec****, nosuid, and nodev (unless
> overridden
>                      by subsequent options, as in the option line
>                      user,exec,dev,suid)
>
> So, short answer, add "exec" to your mount options...
>
>
> HTH-
>
> James
>
>
>
> >
> > Any help would be appreciated,
> > thanks in advance,
> > marco
> > --
> > gentoo-user@gentoo.org mailing list
> >
> >
> --
> gentoo-user@gentoo.org mailing list
>
>
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Re: [gentoo-user] nfs error: "permission denied" when executing a command

[Alan McKinnon]

On Wednesday 18 July 2007, Marco Calviani wrote:
> Hi,
>   i have a problem with NFS. A partition mounted on machine gentoo1
> is correctly exported and mounted in gentoo2 (that is, it is possible
> to read and write on it). However whenever i try to execute a program
> from gentoo2 that it is stored on the exports of gentoo1, i get the
> "Permission denied" error. What can be the cause of this?
>
> This is my /etc/exports located on gentoo1.
>
> /pippo0  gentoo1(sync,no_subtree_check,rw)
> /pippo1  gentoo1(sync,no_subtree_check,rw)
>
> and this is the gentoo2 /etc/fstab relevant part:
>
> gentoo1:/pippo0  /pippo0    nfs          rw,user,auto            0   
> 0 gentoo1:/pippo1  /pippo1    nfs          rw,user,auto            0 
>   0

I find the usual cause of this is either:

- trying to run programs as root, in which case the nfs server will 
squash the gentoo2 request from root to user nobody (uid 65533 or 
such). Solution is no_root_squash option in /etc/exports, usual 
warnings about running as untrusted root apply
- mismatched uids between the two machines. You may well have a user joe 
on both machines but that doesn't mean they have the same uid. You'll 
need to have some kind of centralised user management system in place 
for this (such as NIS), or dream up some scheme using groups, or 
manually sync the /etc/passwd files on both machines

alan


-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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