Installation of NFS (server side)

System Requirements & Prerequisites

On our server (IP :10.10.13.58), we define a place (a folder) which will be reserved for NFS.
In our case, the whole /backup directory is reserved for NFS. We plan to have several shared folders, one by server.
So, in order to do that, we create each of them : /backup/srv01-136 ; /backup/srv01-137 ; /backup/srv01-138 …

If we want to have these servers which are NFS clients, allowed to add files to those locations, we must modify the permissions of each folder of backup.

# chown -R nobody.nogroup backup/

 

Installation and configuration of NFS

On our server, we install NFS with the following commend:

# apt-get install nfs-kernel-server nfs-common portmap

Once it is done, we edit the configuration file /etc/exports in order to allow incomming connections from NFS clients (IP : 10.10.13.16 for exemple) and we define for each NFS clients, a specific folder (those one which we had created in the previous step (/backup/srv01-136).

# nano /etc/exports

# /etc/exports: the access control list for filesystems which may be exported
#               to NFS clients.  See exports(5).
#
# Example for NFSv2 and NFSv3:
# /srv/homes       hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check)
#
# Example for NFSv4:
# /srv/nfs4        gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check)
# /srv/nfs4/homes  gss/krb5i(rw,sync,no_subtree_check)
#

/backup/srv01-136 10.10.13.16/32(rw)

We add the red line to the config file and we save and close the file.

If we want to confirm our configuration, we can execute the next command line:

# exportfs -a

 

Installation of NFS (client side)

System Requirements & Prerequisites

On our client, before installing the NFS package, we need to create and mount a new folder.

We create it at the root of our client:

# mkdir backup

 

Installation and configuration of NFS

Installation of NFS

On our client, we install NFS with the following command line:

Debian :

# apt-get install nfs-common portmap

Ou

# apt-get install nfs-common rpcbind

RedHat :

# yum install nfs

 

Mounting a remote folder

Once it is done, we can mount our new remote folder and make it available from our new local folder created earlier.

So we mount our folder with the argument –t NFS, and with the permission argument –o Read and Write.
/backup points to 10.10.13.58:/backup/srv01-136

Debian :

# mount -t nfs -o rw 10.10.13.58:/backup/srv-136 /backup

RedHat :

# mount -t nfs -o rw 10.10.13.58:/backup/nuwebdev01-05 /backup

 

Mounting at boot

Now, we add a line in the /etc/fstab file so everytime the server is reboot, the mounting will be fine, it will be done automatically.

# nano /etc/fstab

# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
# /dev/sda4
UUID=d434dcfb-56d1-45d7-9a86-28e56813e32e /               ext3    relatime,errors=remount-ro 0       1
# /dev/sda1
UUID=d773cafb-6b4c-455a-88d1-243584a65872 /boot           ext3    relatime        0       2
# /dev/sda8
UUID=5c40d3de-6071-4e63-8461-e5da40c46d36 /home           ext3    relatime        0       2
# /dev/sda7
UUID=02ffccd5-0882-48ee-a5b8-8942b3be74f1 /tmp            ext3    relatime        0       2
# /dev/sda5
UUID=9d5faabc-3df1-4ef7-9968-3dcfa3bfdc6e /usr            ext3    relatime        0       2
# /dev/sda6
UUID=e3d58648-b324-326c-b84e-daf912fefcc2 /var            ext3    relatime        0       2
# /dev/sda3
UUID=b9553074-5eb9-4a5a-2ac3-ef96ac525c09 none            swap    sw              0       0
/dev/scd0       /media/cdrom0   udf,iso9660 user,noauto,exec,utf8 0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto,exec,utf8 0       0

#Debian
10.10.13.58:/backup/srv01-136 /backup nfs rw 0 0

#RedHat
10.10.13.58:/backup/srv01-136 /backup nfs rw 0 0

 

Backup’s script

Now, the backup’s path must point to: /backup

Example of our swtich on srv01-136 :

#!/bin/sh
for DIR in $(ls /home/www/sites); do
        tar -czf /backup/$DIR.tgz -C /home/www/sites $DIR
done

We add our backup’s script to crontab. It will be executed every night at 03h00.

 

NFS Status checking commands

root@srv01-136:/# rpcinfo -p
   program vers proto   port  service
    100000    4   tcp    111  portmapper
    100000    3   tcp    111  portmapper
    100000    2   tcp    111  portmapper
    100000    4   udp    111  portmapper
    100000    3   udp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp  41682  status
    100024    1   tcp  40394  status

Info sur NFS
   $  nfsstat -1
   $  nfsstat -2
   $  nfsstat -3
   $  nfsstat -4