For NFS installation it is not necessary to mount the iso image. It is sufficient to make the iso image itself available via NFS. You can do this by moving the iso image or images to the NFS exported directory:

Ensure that the /publicly/available/directory directory is exported via NFS via an entry in /etc/exports.

To export to a specific system:

/publicly/available/directory client.ip.address(ro,no_root_squash)

To export to all systems use an entry such as:

/publicly/available/directory *(ro,no_root_squash)

Start the NFS daemon (on a Fedora system, use /sbin/service nfs start). If NFS is already running, reload the configuration file (on a Fedora system use /sbin/service nfs reload).