[nbd-disk]
exportname=/data/srv/nbd/nbd-16gb
listenaddress=192.168.11.121

-sysrescd
# /etc/nbd-server/config
[generic]
   user = nbd
   group = nbd
   listenaddr = 192.168.1.1
[partimage]
   exportname = /mnt/cdrom/sysrcd.dat
   port = 2000
And here is an NBD server command:
nbd-server 2000 /mnt/cdrom/sysrcd.dat

-sharing a CD
sudo nbd-server 2000 /dev/sr0
Mounting the CD
sudo nbd-client greeneggs 2000 /dev/nbd0

-EXAMPLES
       A simple nbd-server configuration file would look like this:
             [generic]
             [export]
                 exportname = /export/blkdev

       For increased security, one might want to create an authorization file,
       and set the UID and GID to run as:
             [generic]
                 user = nbd
                 group = nbd
             [export]
                 exportname = /export/blkdev
                 authfile = /etc/nbd-server/allow

       With /etc/nbd-server/allow containing the following:
             127.0.0.1
             192.168.0.0/8
             192.168.1.1

-mount .vdi files
Example
If you want to mount .vdi file use the following syntax
    sudo vdfuse -f /path/to/file.vdi /path/to/mountpoint

/path/to/mountpoint will now contain files like ‘EntireDisk', ‘Partition1', etc.
If there's only one partition showing, you probably want that one.
So to mount the filesystem, just type:
    mount /path/to/mountpoint/Partition1 /path/to/someother/mountpoint

The filesystem should now be mounted on /path/to/someother/mountpoint.