NFS

[Ping problem]

Please send me the procedure for NFS configure in linux .

[~sesh]

There are many HOW-TOs for NFS configuration. If you search for "NFS configuration" in Google, you will find many relevant results. I found this (independent of which Linux Distro you are using):

http://nfs.sourceforge.net/nfs-howto/

Good Luck!

[sandeep mathur]

An NFS server on linux requires 3 services to be running in order to share files:


/etc/rc.d/init.d/portmap
/etc/rc.d/init.d/nfslock
/etc/rc.d/init.d/nfs

You can start/stop/restart these services by issues the above lines with the corresponding arguments: start, stop or restart. You can also use the shortcut 'service' command, as in:

# service portmap start

You need to ensure that these 3 services start up when the system does.

First, verify the default runlevel of the computer. Check the line in /etc/inittab that starts with "id:". The next number will be the default runlevel (usually 3 for non-gui, 5 for gui). You can manage the startup scripts manually by creating symlinks in the corresponding /etc/rc.d/rcX.d directory (where X is the default runlevel) or you can use redhat's "chkconfig" command. Assuming the default runlevel is 3, these 3 commands will ensure that the services necessary for an nfs server start at boot time (these all must run as root):

# chkconfig --level 3 portmap on
# chkconfig --level 3 nfslock on
# chkconfig --level 3 nfs on

Now either reboot the box or issue these commands to start the nfs server:

# service nfs stop
# service nfslock stop
# service portmap stop
# service portmap start
# service nfslock start
# service nfs start

Order is important. Portmap must start first, followed by nfslock, followed by nfs.

The file that defines what directories are shared is /etc/exports. 'man exports' will give you the full overview of all options available for this file. Here is an example line:

/public *(rw,no_root_squash)

This says share the folder /public, allow any IP access, give read/write access, and allow the root user to connect as root.

The * wildcard can be a list or range of IP addresses. For example, if we wanted to restrict this access to the 192.168.1.0/24 Class C subnet, the line would look like this:

/public 192.168.1.0/255.255.255.0(rw,no_root_squash)

rw means read/write. no_root_squash is a setting that allows nfs clients to connect as root. Without this setting, the root user on clients that connect has the permissions of the user 'nfsnobody', uid 65534.

Anytime you make any changes to the /etc/exports file, run the command:

# exportfs -avr
on the server to update the nfs server.