HOW TO CONFIGURE NFS SERVER IN RHEL5 (LINUX)

NFS (Network file System)SERVER SIDE CONFIGURATION

The Network File system is one of the most widely used network services.NFS is based on the
Remote procedure call or Portmap Service.It allows the client to mount,automount and therefore,transparently
access the remote file systems on the network.

Portnumber use:-

Port: 2049 {udp,tcp} by nfs
port: 111 {udp,tcp,sunrpc} by portmap

So, NFS daemon should be listening on both standard ports 2049 and portmap on port 111.

You can Check the portnumber of any protocol or service using following command:-

#cat /etc/services | grep 111 (here 111 is portnumber of portmap service)

#cat/etc/services | grep 2049 (here 2049 is portnumber of nfs)


We can also check the functioning of NFS by rpcinfo command.

#rpcinfo -p

after this we need to define all export folder or directories (all directories u want to share)
in /etc/exports file.


#vim /etc/exports

/home/directoryname 10.0.0.1(rw,sync,no_root_squash)
/home/dir1 10.0.0.0/24(ro,sync)


sync=synchronized mode
no_root_squash= by using this the remote client root user will be treated as a root and will
be able to change any file and directory and work as a root for that directory



Then after this restart the nfs service :-


# /etc/init.d/nfs restart or service nfs restart



If you later add some more exports in the /etc/exports file you can restart the nfs service
or run the exportfs command:

#exportfs -ra

SUDO Configuration Linux (RHEL5)

Sudo is actually stands for SuperUserDO.

Now the question is what is the need of Sudo command in linux.Actually if you have some users in your organization who want to execute some commands or access some files or directories which can be access only by super user i.e root user. So now what will u do ?
You have to give root password to every users who want to run those commands or access those directories or files.

But Guys and Gals this is not the correct solution for this scenario.

You need to implement SUDO .

In SUDO you need not to provide root password to users just to run those commands or access the database. You need to define priviledges for those users on particular command or group of command or more.After that user need to run the same command but the command should start with "sudo".

Syntax of Sudo command:-

sudo

here is your full command including options and arguments.

for example:-

sudo ls -l /root