ISO image from OVS Repository as yum repository for guest.

Hi,

normally when I install a oracle Linux on machine, I mount same iso file as a repository as below.

1. #mv /etc/yum.repos.d/public-yum-ol6.repo public-yum-ol6repo

2. create new repository as below

# cat OL.repo

[OL]

name=Oracle Linux x86_64

baseurl=file:///var/OSimage/OL

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY

gpgcheck=1

enabled=1

3. #mount -o loop /ISOs/OraLin.iso /var/OSimage/OL

Now I am configuring OVM (Oracle Virtual Server) and I already have ISO image in one of the repository, can I use this ISO file on all my guest VM as repository(without coping).
if yes please suggest the steps. (one I could think of is NFS, but I don't know the steps for NFS - (sharing nfs mount point to all VMs as RO)