adding NFS to Oracle VM Server

After setting up OVS, I wanted to install some software in one of my guest (11g database). But I didn't have any access to shares/mounts with all the ISO's and software trees in Dom0 from my guests! The first solution is to actually copy (scp) the software from Dom0 to the guest. This ofcourse works, but is tedious and as again unnecessary.
Why not expose the mountpoints to my guests with NFS! We need to setup Dom0 as an NFS server and the guest as clients.

NFS Server configuration

• What to make available through NFS:
  
  create the file: /etc/exports
  format: directory client-ip(options)
  directory=Which directory to export
  client-ip=hostname/range,ip-address/range
  (options)
  -ro=readonly for client
  -rw=read/write for client
  -no_root_squash=client as root gets root access to nfs aswell, instead of as nobody
  -sync
  
  example
  /OVS/remote *.vanesch.nl(rw,sync,no_root_squash)
  /mnt/share/software *.vanesch.nl(ro,sync)
  
  
• How to make NFS available
  We need to activate two services: portmapper and nfs(which start several daemons)
  
  service nfs start
  service portmap start
  
  Let's make sure these services are started across reboots:
  chkconfig --level 35 nfs on
  chkconfig --level 35 portmap on
  

NFS client configuration

• What to have availableWe need to edit: /etc/fstab
  format: source mountpoint nsf options 0 0
  Options: rw,bg,intr,hard,timeo=600,wsize=32768,rsize=32768,nfsvers=3,tcp
  
  
  I will add both exports from my NFS Server (dom0.vanesch.nl) to this guest:
  
  dom0.vanesch.nl:/OVS/remote /mnt/nfs nfs rw,bg,intr,hard,timeo=600,wsize=32768,rsize=32768,nfsvers=3,tcp 0 0
  
  dom0.vanesch.nl:/mnt/share/software /mnt/software nfs ro,bg,intr,hard,timeo=600,wsize=32768,rsize=32768,nfsvers=3,tcp 0 0
  
  
• How to make NFS available
  Again we need to start the same two services
  
  service nfs start
  service portmap start
  
  Let's make sure these services are started across reboots:
  chkconfig --level 35 nfs on
  chkconfig --level 35 portmap on

One other thing is important! Turn off the firewalls in Dom0 and your guests.

service iptables stop
chkconfig iptables off

Now you can run installations (or mount ISO's) from your NFS shares.