nfs mount failed:
mount 10.10.2.20:/tmp/nfsmount /mnt/nfs/
mount: wrong fs type, bad option, bad superblock on 10.10.2.20:/tmp/nfsmount,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount.<type> helper program)
In some cases useful info is found in syslog - try
dmesg | tail or so
In this case the client machine didn't have nfs-utils installed! You would think that when trying to mount that the error would indicate this!
yum -y install nfs-utils
So make sure you have nfs client utilities installed on the machine you are trying to mount the nfs share from!