NFS Server setup on LINUX and Mounting NFS on another server

http://tldp.org/HOWTO/NFS-HOWTO/server.html
http://www.cyberciti.biz/tips/ubuntu-linux-nfs-client-configuration-to-mount-nfs-share.html
http://nfs.sourceforge.net/

Troubleshoot at packet level using the following command
#tcpdump -ieth0 -vv -nn -X host 10.9.1.1

1. Add entry to /etc/exports file (ON NFS SERVER01)
   
   
   # <NFSshare dir> <ip address to allow (optional parameters)>
   /archive 10.9.1.0/24(no_wdelay,rw,async)
   /archive/shareHL7 10.9.1.9(rw,sync) 10.9.1.11(rw,sync) 10.9.1.12(rw,sync) 10.9.1.0/24(ro,async) 10.9.1.8(rw,sync)
   
   
   
2. Test if the share is active on the server
   
   Client01:# showmount -e server01
   
   
3. On NFS Client01 (Open /etc/fstab file)
   
   # Server:/<dir>/ <mountpoint> <type> <optional parameters>
   NFSSERVER01:/archive/shareHL7 /archive nfs rw,hard,bg,tcp,nfsvers=3,rsize=32768,wsize=32768 0 0
   
   
   
4. Allow hosts access TCP (/etc/hosts.allow)
   Add following line
   
   portmap: 10.9.1.8 , 10.9.1.9 , 10.9.1.11 , 10.9.1.12
   
   
   
   
5. Re-read exports file
   You should run the command exportfs -ra to force nfsd to re-read the /etc/exports file
   

ISSUES: mount to NFS Server failed: RPC Error: Program/version mismatch (retrying).

Test your nfs version by typing
#man nfs
#yum --version nfs
#rpm -qa | grep -i nfs

List all the readily available versions
#rpcinfo -u localhost nfs

• NFS Versions 2, 3, and 4 are supported on 2.6 and later kernels.
• NFS over UDP and TCP on IPv4 are supported on the latest 2.4 and 2.6 kernels.