Based on nfsv4-on-centos-53-and-fedora-11

How to setup NFS4 (and refusing NFS 1, 2 or 3 requests):

• Install package portmap and nfs-utils
• Modify /etc/idmapd.conf
• Stop and remove unnecessary services
• Start services portmap and rpcidmapd

yum install portmap nfs-utils
 
vi /etc/idmapd.conf
# (...)
# change Nobody-{User,Group} to nfsnobody
# change Domain to <your.fully.qualified.domain.name>
# (...)
 
chkconfig nfslock off
chkconfig rpcgssd off
chkconfig rpcsvcgssd off
service nfslock stop
service rpcgssd stop
service rpcsvcgssd stop
 
chkconfig portmap on
chkconfig rpcidmapd on
service portmap start
service rpcidmapd start

• Stop nfs service (in case the installation of package started it)
• Create the root directory for exports (this is specific to NFS v4), eg: /nfs4exports
• Create a directory you will export on the behalf of the real directory to be exported, eg: /nfs4exports/share1
• Edit /etc/fstab to bind the nfs share directory to the real directory to be exported
• Edit /etc/exports to export your directory
• Mount and bind the directory to export
• Edit /etc/sysconfig/nfs to activate NFS v4, disable nfs v3 services and <3 compatibility
• (re)Start and activate NFS service
• (re)Exports all NFS shared folders

service nfs stop
 
mkdir -p /nfs4exports/share1
 
vi /etc/fstab
# (...)
/somedirectory/youwanttoshare  /nfs4exports/share1    none    bind    0 0
 
mount /nfs4exports/share1
ls /nfs4exports/share1      # Just check
 
vi /etc/fstab
# Replace IP or network by your values
# There is no space between host or IP and export parameters in parenthesis, see the big "Caution" at [[http://www.redhat.com/docs/manuals/enterprise/RHEL-4-Manual/en-US/System_Administration_Guide_/Exporting_NFS_File_Systems-Command_Line_Configuration.html|RHEL4 System Administration Guide - NFS chapter]]
/nfs4exports 192.168.0.0/255.255.255.0(rw,insecure,no_subtree_check,nohide,fsid=0)
/nfs4exports/share 192.168.0.0/255.255.255.0(rw,insecure,no_subtree_check,nohide)
 
vi /etc/sysconfig/nfs
# Add or modify  following settings :
MOUNTD_NFS_V1="no"
MOUNTD_NFS_V2="no"
RPCNFSDARGS="-N 2 -N 3 -U"
 
chkconfig nfs on
service nfs restart
 
exportfs -ar

• Stop and remove unnecessary services
• Create the mountpoint directory, eg. /mnt/share1
• Edit /etc/fstab to add the mount
• Mount and enjoy

chkconfig nfs off
service nfs stop

mkdir -p /mnt/share1

vi /etc/fstab
# (...)
<NFS_server_host>:/share1   /mnt/share1   nfs4    rsize=8192,wsize=8192,timeo=14,intr,user