Subject: Re: Problem with sharing /home
From: Daniel Stodden <daniel.stodden@citrix.com>
To: Mahmood Naderan <nt_mahmood@yahoo.com>
Cc: "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
In-Reply-To: <965737.12090.qm@web111718.mail.gq1.yahoo.com>
References: <965737.12090.qm@web111718.mail.gq1.yahoo.com>
Content-Type: text/plain; charset="UTF-8"
Date: Sun, 09 Jan 2011 01:33:27 -0800
Message-ID: <1294565607.30270.14.camel@ramone>
Sender: linux-nfs-owner@vger.kernel.org
MIME-Version: 1.0


User names are meaningless to the filesystem. Numbers matter. Make sure
that the name->uid map is identical in all passwd files.

In the case below, user1 can't write to /home/user1 because on worker
she's got a different uid than on server. Likewise, user3 there appears
to own /home/user1 because the uid in question was given to user3.

Try the 'id' and 'ls -n' commands to figure it out. Edit passwd and
group to fix it.

Daniel

On Sun, 2011-01-09 at 02:41 -0500, Mahmood Naderan wrote:
> Hi,
> I have a server (192.168.1.1) and worker (192.168.1.2) stations and want to 
> share /home which is belong to the server. This is the content of my 
> /etc/exports:
> /home                192.168.1.2(rw,sync,no_root_squash)
> 
> Before sharing, the list of users on both stations are:
> server: root, mahmood, user1, user2
> worker: root, mahmood, user3, user4
> 
> As you can see two users are common. Then I opened /etc/fstab on worker and 
> commnet the original /home line and added this line:
> server:/home  /home  nfs defaults 0 0
>  
> Then I ran "sudo exportfs -a" on server and "sudo mount -a" on the worker. 
> Please look at the output of "ls -l" command on both server and worker:
> mahmood@server:home$ ls -l
> total 36
> drwxr-xr-x 28 user1       users    4096 2011-01-08 21:49 user1
> drwxr-xr-x  4 user2        users    4096 2011-01-08 21:55 user2
> drwx------  2 root       root    16384 2010-10-24 17:23 lost+found
> drwxr-xr-x 26 mahmood    mahmood  4096 2011-01-09 10:49 mahmood
> 
> mahmood@worker:home$ ls -l
> total 36
> drwxr-xr-x  4 user3  users    4096 2011-01-08 21:55 user1
> drwxr-xr-x  9 user4 users    4096 2011-01-08 23:05 user2
> drwx------  2 root    root    16384 2010-10-24 17:23 lost+found
> drwxr-xr-x 26 mahmood mahmood  4096 2011-01-09 10:49 mahmood
> drwxrwxrwx  5 root    root     4096 2011-01-05 21:27 shared
> 
> As you can see, the permission of user1 and user2 home direcoties are granted to 
> user3 and user4. But since "mahmood" and "root" have separate account on both 
> stations, there is no problem with their access. 
> 
>  
> The effect of this anomaly is that when user1 want to ssh from server to wroker, 
> he can not write anything in his home direcotry:
> user1@server:~$ mkdir a
> user1@server:~$ ssh worker
> enter password....
> user1@worker:~$ mkdir b
> mkdir: cannot create directory `b': Permission denied
> user1@worker:~$
> 
> How can I fix that?
> 
> Thanks,
> // Naderan *Mahmood;
> 
> 
>       
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