using NFS server with RHEL 6

[Kevin Thomas <axel2078@gmail.com>]

If you are planning on using NFS (server) with RHEL 6 or a derivative 
(SL6 or CentOS 6 whenever it comes out), you may run into some 
problems.  I tried this tonight in my new SL6 installation and it took 
me about 3 hours of troubleshooting and googling to get it working.  I 
tested it earlier today using CentOS 5.5 and it worked without a hitch 
with minimal effort.  I was able to create a nfs share like this in my 
/etc/exports:

/nfs    192.168.10.0/24(sync,ro)

Then i just had to restart nfs (sudo service nfs restart) and I was able 
to mount it from a RHEL 5.3 server just by doing mount centos:/nfs 
/temp.  Simple enough.  It's not that simple starting in RHEL6. First of 
all, iptables blocks the ports needed for nfs clients to connect to the 
nfs server, so you will either have to turn off iptables or figure out 
how to add the necessary ports and then restart all the affected 
services. Secondly, if you don't use the "insecure" parameter when you 
create your share, you'll get an "operation not permitted" error when 
you try to mount it.  An example would look like this:

/nfs 192.168.10.0/24(sync,ro,insecure) <-----notice the spacing....it 
makes a difference

If anyone has an interest in setting this up, I wrote a detailed how-to 
for this based on various sources I found online.

Kevin



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