Problem with sharing /home

Problem with sharing /home

[Mahmood Naderan]

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;


      

Re: Problem with sharing /home

[Daniel Stodden]

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;
> 
> 
>       
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Problem with sharing /home

[Mahmood Naderan]

>Make sure that the name->uid map is identical in all passwd files.
> Try the 'id' and 'ls -n' commands to figure it out. Edit passwd andgroup to fix 
>it.

Can you explain more? "id" shows the UID for each user and "ls -n" shows which 
UID grant the /home/direcotry.  Which sections of passwd and group have to be 
changed?


// Naderan *Mahmood;



----- Original Message ----
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>
Sent: Sun, January 9, 2011 1:03:27 PM
Subject: Re: Problem with sharing /home


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;
> 
> 
>      
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


      

Re: Problem with sharing /home

[Mahmood Naderan]

>Edit passwd andgroup to fix it.
I forgot to ask should I edit those files on server or worker?

 
// Naderan *Mahmood;



----- Original Message ----
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>
Sent: Sun, January 9, 2011 1:03:27 PM
Subject: Re: Problem with sharing /home


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;
> 
> 
>      
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


      

Re: Problem with sharing /home

[Daniel Stodden]

On Sun, 2011-01-09 at 04:43 -0500, Mahmood Naderan wrote:
> >Make sure that the name->uid map is identical in all passwd files.
> > Try the 'id' and 'ls -n' commands to figure it out. Edit passwd andgroup to fix 
> >it.
> 
> Can you explain more? "id" shows the UID for each user and "ls -n" shows which 
> UID grant the /home/direcotry.  Which sections of passwd and group have to be 
> changed?

$ man 5 passwd

Re: Problem with sharing /home

[Daniel Stodden]

On Sun, 2011-01-09 at 04:46 -0500, Mahmood Naderan wrote:
> >Edit passwd andgroup to fix it.
> I forgot to ask should I edit those files on server or worker?

Ideally on the worker.

The reason is that wherever you have to change the user account on the
server, you will need to recursively fix the permissions on her home
directory. That's more work. If necessary, check your favorite unix
manual for details.

See 'man 5 passwd' for info on the passwd file.

Daniel

> // Naderan *Mahmood;
> 
> 
> 
> ----- Original Message ----
> 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>
> Sent: Sun, January 9, 2011 1:03:27 PM
> Subject: Re: Problem with sharing /home
> 
> 
> 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;
> > 
> > 
> >      
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 
>       
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: Problem with sharing /home

[Mahmood Naderan]

Thanks for that. I changed the UID and GID for users who have conflict with each 
other. 

One more question. If I add a new user on server, can he ssh to the worker 
without problem?

Thanks, 
// Naderan *Mahmood;



----- Original Message ----
From: Daniel Stodden <daniel.stodden@citrix.com>
To: Mahmood Naderan <nt_mahmood@yahoo.com>
Cc: nfs <linux-nfs@vger.kernel.org>
Sent: Sun, January 9, 2011 3:11:14 PM
Subject: Re: Problem with sharing /home

On Sun, 2011-01-09 at 04:46 -0500, Mahmood Naderan wrote:
> >Edit passwd andgroup to fix it.
> I forgot to ask should I edit those files on server or worker?

Ideally on the worker.

The reason is that wherever you have to change the user account on the
server, you will need to recursively fix the permissions on her home
directory. That's more work. If necessary, check your favorite unix
manual for details.

See 'man 5 passwd' for info on the passwd file.

Daniel

> // Naderan *Mahmood;
> 
> 
> 
> ----- Original Message ----
> 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>
> Sent: Sun, January 9, 2011 1:03:27 PM
> Subject: Re: Problem with sharing /home
> 
> 
> 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;
> > 
> > 
> >      
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 
>      
> --
> To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html