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Old 02-21-2010, 08:43 AM   #1
Registered: Dec 2009
Posts: 200

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nfs share for linux installation

dear gurus,

i build a machine which has nfs shared all network. now i want to install from there, i boot cd centos and ask method where i select nfs, i did not recongnize

advise me few things

the share is soft copy folder of cd inside harddisk
/share/centos54 *(rw,sync)

where, nfs services r working fine from server and client. but question if fstab need to edit such case,it not accessable from boot linux installation. advise

i check commands
rpcinfo -p
exprtfs -v
showmount -e
exportfs -r

on client also i test it(another linux machine)
rpcinfo -p

the os,dns,nfs services restarted already

Old 02-22-2010, 04:22 AM   #2
Registered: Feb 2008
Distribution: Fedora,RHEL,Ubuntu
Posts: 661

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What path you mention for nfs installation tree on installing client ?
Old 02-22-2010, 07:47 AM   #3
Registered: Jan 2005
Location: Summer Midwest USA, Central Illinois, Winter Central Florida
Distribution: SlackwareŽ
Posts: 13,692
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You might want to use the 'r' or 'a' options when you 'exportfs'. That is if things are correct in the '/etc/exports' file.

excerpt 'man exportfs';

The exportfs command is used to maintain the current table of exported file systems for NFS. This
list is kept in a separate file named /var/lib/nfs/etab which is read by mountd when a remote host
requests access to mount a file tree, and parts of the list which are active are kept in the ker-
nel's export table.

Normally this etab file is initialized with the list of all file systems named in /etc/exports by
invoking exportfs -a.

However, administrators can choose to add and delete individual file systems without modifying
/etc/exports using exportfs.

exportfs and it's partner program mountd work in one of two modes, a legacy mode which applies to
2.4 and earlier versions of the Linux kernel, and a new mode which applies to 2.6 and later ver-
sions providing the nfsd virtual filesystem has been mounted at /proc/fs/nfsd or /proc/fs/nfs. If
this filesystem is not mounted in 2.6, the legacy mode is used.

In the new mode, exportfs does not give any information to the kernel but only provides it to
mountd through the /var/lib/nfs/etab file. mountd will listen to requests from the kernel and will
provide information as needed.

In the legacy mode, any export requests which identify a specific host (rather than a subnet or
netgroup etc) are entered directly into the kernel's export table as well as being written to
/var/lib/nfs/etab. Further, any mount points listed in /var/lib/nfs/rmtab which match a non host-
specific export request will cause an appropriate export entry for the host given in rmtab to be
entered into the kernel's export table.

-a Export or unexport all directories.

-o options,...
Specify a list of export options in the same manner as in exports(5).

-i Ignore the /etc/exports file, so that only default options and options given on the command
line are used.

-r Reexport all directories. It synchronizes /var/lib/nfs/etab with /etc/exports. It removes
entries in /var/lib/nfs/etab which are deleted from /etc/exports, and remove any entries
from the kernel export table which are no longer valid.

-u Unexport one or more directories.

-f In 'new' mode, flush everything out of the kernels export table. Any clients that are active
will get new entries added by mountd when they make their next request.

-v Be verbose. When exporting or unexporting, show what's going on. When displaying the current
export list, also display the list of export options.
Look at 'Linux NFS' to gain some insight from additional links.

Just a few more links to aid you;

Linux Documentation Project
Rute Tutorial & Exposition
Linux Command Guide
Utimate Linux Newbie Guide
Getting Started with Linux
Advanced Bash-Scripting Guide
Linux Home Networking

The above links and others can be found at 'Slackware-Links'. More than just SlackwareŽ links!


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