You need to know how to manually start NFS.
All RightImages contain the packages to start NFS on the instance. You can do this via the following commands:
service portmap start service nfslock start rpc.idmapd start service nfs start
You are responsible for properly configuring NFS and add directories to be exported to /etc/exports. You can find more information on NFS here: http://nfs.sourceforge.net/.
Note that RightScale also provides ServerTemplates for NFS servers:
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