Sharing ISO images over NFS Post: 90149

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Special Forums Hardware Filesystems, Disks and Memory Sharing ISO images over NFS Post 90149 by deckard on Saturday 19th of November 2005 02:41:39 AM

11-19-2005

Registered User

Sharing ISO images over NFS

I've got a bunch of application CDs that I use here at home under Wine. They are Windows applications and as such, some of them want to see the volume label in order for the application to run. So... just copying the CD-ROM contents to a directory doesn't work. With that in mind, what I've done in the past is make ISO images of the CD-ROMs on my hard drives and mount them locally. The mounted device is then mapped to "Drive D:" in Wine. This has always worked well. But I wanted to prevent wasting HD space on my clients, so I centralized the ISOs on a server. Until now, I've been using Samba to share those ISOs but seeing that I no longer have any Windows boxes, I've been moving away from Samba and onto NFS. However, I now have a problem. If I mount 'server:/mnt/data/cdserv' on /mnt/data/cdserv on the client, I can see my ISO images. No problem. But when I try to mount one of those ISO images to /mnt/cdrom1. I get a "permission denied" error.

While testing, I tried to manually associate /dev/loop0 with /mnt/data/cdserv/abh12.iso and I got the same "permission denied" error. So it sounds like the process fails when setting up a loop device. What is odd is that iso9660 is a read only file system. I have the NFS server exporting 'ro' and the export is mounted 'ro'. So my guess is that the "permission denied" error is being caused by the loop set up and nothing else. Any ideas why? Do I need to use a special option with losetup if I set the loop device up manually? Or is it an NFS export or mount issue? Is there some aspect of the ISO image that's not getting carried over NFS? This worked very well for me under Samba, but I really don't need Samba anymore and would hate to keep it around for just this one application.

One more thing I just discovered. I created a looped ext2 filesystem image and put it in the same location that my ISOs are. I tried to mount it via nfs as a loop device and got the same "permission denied" error. So it definitely seems that losetup/loop devs don't like to be exported via NFS. I'm still not sure why though since NFS seems to act like a normal filesystem in every other regard. Still searching for an answer...

Last edited by deckard; 11-19-2005 at 04:08 AM..

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LEARN ABOUT OSX

mount.nfs

MOUNT.NFS(8)						      System Manager's Manual						      MOUNT.NFS(8)

NAME

       mount.nfs, mount.nfs4 - mount a Network File System

SYNOPSIS

       mount.nfs remotetarget dir [-rvVwfnsh ] [-o options]

DESCRIPTION

       mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality.

       mount.nfs  is  meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone
       command with limited functionality.

       remotetarget is a server share usually in the form of servername:/path/to/share.  dir is the directory on which the file system	is  to	be
       mounted.

       Under  Linux  2.6.32  and  later  kernel  versions, mount.nfs can mount all NFS file system versions.  Under earlier Linux kernel versions,
       mount.nfs4 must be used for mounting NFSv4 file systems while mount.nfs must be used for NFSv3 and v2.

OPTIONS

       -r     Mount file system readonly.

       -v     Be verbose.

       -V     Print version.

       -w     Mount file system read-write.

       -f     Fake mount. Don't actually call the mount system call.

       -n     Do not update /etc/mtab.	By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making
	      an entry.

       -s     Tolerate sloppy mount options rather than fail.

       -h     Print help message.

       nfsoptions
	      Refer to nfs(5) or mount(8) manual pages.

NOTE

       For further information please refer nfs(5) and mount(8) manual pages.

FILES

       /etc/fstab	 file system table

       /etc/mtab	 table of mounted file systems

SEE ALSO

       nfs(5), mount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

								    5 Jun 2006							      MOUNT.NFS(8)