[K12OSN] NFS Install

Peter Scheie peter at scheie.homedns.org
Wed Jan 21 03:29:46 UTC 2009

For doing installs via NFS, it is not necessary to mount the ISOs nor copy all 
the files within the ISOs to the exported directory.  It is only necessary to 
export the directory containing the ISO files.  This only applies to installing 
via NFS.  If the server-to-be is installed via http or ftp, then all the files 
contained in the ISOs must be copied to the directory served by the http or ftp 

Another thing to try would be booting a live CD or USB on the server and seeing 
if you can mount the share(s) from the NFS server.


David L. Willson wrote:
> I don't think it works to export the ISO as a file.  I think you have to mount the ISO, or the CD, or copy all the files, and export the actual files from the ISO to do an NFS install.  But, that's not what's preventing the NFS mount.
> You've tested mounting this export from other NFS clients.  Can you list the contents of the export from a successfully connected NFS client?
> For example:
>   # mount spiff:/mnt/iso /mnt
>   # ls -al /mnt
> What's that get?
> And when you do your mount from the installer, what information are you providing in the NFS dialog?
> David L. Willson
> Network Engineer
> MCT, MCSE, Linux+
> tel://720.333.LANS
> ----- Original Message -----
> From: "j.w. thomas" <jthomas at bittware.com>
> To: "K12OSN" <k12osn at redhat.com>
> Sent: Tuesday, January 20, 2009 11:05:21 AM GMT -07:00 US/Canada Mountain
> Subject: [K12OSN] NFS Install
> I'm trying to do an NFS install of the
> I've followed the instructions for setting up the nfs server as per 
> http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-steps-network-installs-x86.html
> And then proceeded to the instructions for the install at
> http://www.centos.org/docs/5/html/Installation_Guide-en-US/s1-begininstall-nfs-x86.html
> I can mount the NFS export from another Linux box, so I am convinced the 
> NFS server is correctly configured.  When I get to the prompt to enter 
> the IP address of the NFS server and the mount point, I enter the 
> correct (I'm sure) info, and then hit enter.  I am greeted with this:
> Error
> That directory could not be
> mounted from the server
> OK
> mount: RPC: Authentication error; why = Failed (unspecified error)
> I have copied the iso to the exported directory:
> cp ~jthomas/Download/K12LTSP-5.0.0EL-64bit-dvd.iso /mnt/iso/
> Here's my /etc/exports
> # cat /etc/exports
> /mnt/iso *(ro,no_root_squash)
> I restarted the nfs server after creating /etc/exports, and everything 
> there looks OK:
> # service nfs restart
> Shutting down NFS mountd:                                  [  OK  ]
> Shutting down NFS daemon:                                  [  OK  ]
> Shutting down NFS quotas:                                  [  OK  ]
> Shutting down NFS services:                                [  OK  ]
> Starting NFS services:                                     [  OK  ]
> Starting NFS quotas:                                       [  OK  ]
> Starting NFS daemon:                                       [  OK  ]
> Starting NFS mountd:                                       [  OK  ]
> When I try to mount from the installtion scripts, /var/log/messages 
> tells me this:
> Jan 20 13:04:17 spiff mountd[20920]: connect from to proc 
> (1) in mountd: request from unauthorized host
> Any help here would be very much appreciated!

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