NFSv4 not able to set any sockets for nfsd without running rpcbind

This was a bug in NFS server kernel module. It was patched in December 2013.

Starting with kernel 3.14, rpcbind is no longer required to run in-kernel NFS server.

(assuming that server is configured to use only NFSv4 and higher)

http://lxr.free-electrons.com/source/net/sunrpc/svc.c?v=3.14#L966

You can find more information about that change in this thread:

http://www.spinics.net/lists/linux-nfs/msg41053.html

Therefore, your configuration:

MOUNTD_NFS_V2="no"
MOUNTD_NFS_V3="no"
RPCNFSDARGS="-N 2 -N 3"

should now work without rpcbind.

When you use only NFSv4, none of these services are required:

/etc/rc.d/init.d/nfslock
/etc/rc.d/init.d/rpcgssd
/etc/rc.d/init.d/rpcidmapd
/etc/rc.d/init.d/rpcsvcgssd

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