I am using NFS server version 4.x on a CentOS/RHEL based system. I’m mounting my shared /var/www/ directory on five Apache based nodes using the following syntax:

mount -t nfs4 -o rw,intr,hard,proto=tcp rocknas02:/httproot/www /var/www/

I noticed that due to bug in my app user can sometime upload executable or other device files to get out of chrooted Apache server. How can I prevent such security issues on a CentOS or RHEL based NFS client and sever setup?
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How do I install and configure NFS version 4 server under Debian or Ubuntu Linux server operating systems using host-based authentication?
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I‘ve netapp NFS server with /data3 as shared directory. I type the following command at Ubuntu Linux to mount the NFS server:

mount fs2:/data3 /nfs/
OR
mount 192.168.1.100:/data3 /nfs/

But I’m getting an error which read as follows:

mount: wrong fs type, bad option, bad superblock on fs2:/data3,
missing codepage or helper program, or other error
(for several filesystems (e.g. nfs, cifs) you might
need a /sbin/mount. helper program)
In some cases useful info is found in syslog – try
dmesg | tail or so

How do I fix this problem?
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How do I setup NFS v4.0 distributed file system access server under CentOS / RHEL v5.x for sharing files with UNIX and Linux workstations? How to export a directory with NFSv4? How to mount a directory with NFSv4?
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The portmapper assigns each NFS service to a port dynamically at service startup time. How do I allow legitimate NFS clients to access the NFS server using RHEL / Fedora / CentOS Linux 5.x iptables firewall?
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