[virt-tools-list] Failed to create VM with iso on an NFS mount

Cole Robinson crobinso at redhat.com
Tue Dec 22 15:21:29 UTC 2009

On 12/22/2009 06:04 AM, Dan Bar Dov wrote:
> Using Fedora 12, virt-manager-0.8.0, I tried to create a VM
> and specify installation from iso.
> The iso happens to be located on a NFS mount (that has root_squash)
> Looks like virt-manager tries to set something on the iso file.

libvirt in F12 runs the qemu binary as a non-root user (qemu:qemu) for
security reasons. This is a change from F11. In order for this to work,
libvirtd (running as root) attempts to temporarily change the user:group
of all files being used by the qemu binary.

Since the root user can't change your ISO perms due to root_squash, this
is failing. I would recommend moving your ISO out of your root_squash'ed
directory. See [1] for more info:

[1] https://bugzilla.redhat.com/show_bug.cgi?id=517304

- Cole

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