Re: Problem NFS mounting Centos 7 file systems from vxWorks 5.5

[Ralph Lange <ralph.lange@gmx.de>]

Hi Mark,

You do recall that VxWorks 5.5 only has an NFS 2 implementation, right?

(See http://www.vxdev.com/docs/vx55man/vxworks/netguide/c-remAccApps.html#87831)

Are you sure that your CentOS 7 box exports the file system also as NFS 2?

Cheers,
~Ralph

On Thu, Jan 19, 2017 at 1:51 PM, Mark Rivers <rivers@cars.uchicago.edu> wrote:

> But one observation I made is that Centos 7 uses NFS 4.
> To my understanding NFS 4 does not map the numerical user/group id
> "1:1", by default, but wants to translate the remote user id into a local one in some way.
> And this is a security improvement.

> Can you mount Centos 7 -> Centos 7 ?

Yes, we have successfully NFS mounted Centos 7 file systems from the following systems:

Centos 7
RHEL 6
Fedora 9
Fedora 15
Fedora 23
vxWorks 6.9.4

The only one that does not seem to work is vxWorks 5.5.

Han wrote:
>   Do you enable firewall service?

No, firewalld is not running.

Mark


________________________________________
From: Torsten Bögershausen [torsten.bogershausen@esss.se]
Sent: Thursday, January 19, 2017 12:37 AM
To: Mark Rivers; tech-talk@aps.anl.gov
Subject: Re: Problem NFS mounting Centos 7 file systems from vxWorks 5.5

>Is anyone running vxWorks 5.5 with a Centos 7/ RHEL 7, etc. modern NFS server?
Not me.

But one observation I made is that Centos 7 uses NFS 4.
To my understanding NFS 4 does not map the numerical user/group id
"1:1", by default, but wants to translate the remote user id into a local one
in some way.
And this is a security improvement.

In short: We needed to tweak a file called /etc/idmapd.conf.
I can dig out the details later.

Can you mount Centos 7 -> Centos 7 ?



On 19/01/17 02:00, Mark Rivers wrote:
> Folks,
>
>
>
> We are mostly running VxWorks 6.9.4 now, and with that we have no problem NFS
> mounting file systems on Centos 7.
>
>
>
> However, we have a few IOCs that still need to run VxWorks 5.5.  These can
> mount file systems on Centos 5 servers fine.  However, on Centos 7 we see the
> following:
>
>
>
> -          The NFS mount command from vxWorks succeeds with no error
>
> -          showmount on the Centos 7 system shows that the vxWorks system has
> mounted the file system OK
>
> -          However, the vxWorks system cannot actually read or write any files
> on the file system.
>
>
>
> If I type the “ls” command in a valid directory I get
>
>
>
> Cant’ open “null”.
>
> Value=-1
>
>
>
> The problem is not file permissions, it works fine if we are running the
> identical IOC with vxWorks 6.9.4, and we have tried setting the files in that
> directory to mode 755.
>
>
>
> Is anyone running vxWorks 5.5 with a Centos 7/ RHEL 7, etc. modern NFS server?
> If so, how does one get it to work?
>
>
>
> Thanks,
>
> Mark
>
>
>
>
>
>
>