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

[Torsten Bögershausen <torsten.bogershausen@esss.se>]

Search for
RPCMOUNTDOPTS

in
/etc/sysconfig/networking/nfs
and
/etc/init.d/nfs

But I am afraid that NFS 2 is no longer supported:
<https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Storage_Administration_Guide/index.html#ch-nfs>

OK, this is RHEL and not Centos, I guess that they only support V3 and V4,
or am I wrong ?




On 19/01/17 15:05, Mark Rivers wrote:
> > Are you sure that your CentOS 7 box exports the file system also as NFS 2?
> That is probably the problem.  Do you know how to enable that?
>
> Thanks,
> Mark
>
>
> ________________________________
> From: Ralph Lange [ralph.lange@gmx.de]
> Sent: Thursday, January 19, 2017 7:08 AM
> To: Mark Rivers
> Cc: EPICS Tech Talk
> Subject: Re: Problem NFS mounting Centos 7 file systems from vxWorks 5.5
>
> 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<mailto: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<mailto:torsten.bogershausen@esss.se>]
> Sent: Thursday, January 19, 2017 12:37 AM
> To: Mark Rivers; tech-talk@aps.anl.gov<mailto: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