Monday, August 25, 2014

Mounting the NFS shared folder from Net Gear ReadNAS Device

This document illustrate how to create a shared folder in Netgear ReadyNAS device and mount it to virtual host or physical host.

We can create either shared folder in NAS or a new volume, in my case I have created a shared folder coz creating multiple volume option was not available on the NAS device which I was using
Go to NAS device admin page and crate a folder, and enable NSF protocol to access that folder.


Make sure you have given proper access and allowed all the IPs address from which you want to access the NAS device shared folder using NAS admin page under NFS protocol 


Once creation of folder, protocol enabling and security provisioning is done, then we can login to putty session for a host where we want to map this NAS folder.

There must be two service up and running on the host e.g. ‘rpcbind’ and ‘nfs’, check these service using below command given in snap –

If the service are not running, then install ‘nfs-utils’ package.

Check the service ‘rpcbind’ and ‘nfs’ service status now, it’s must be available but stopped now

Start ‘rpcbind’ and ‘nfs’ service 


Once the services started then we can use below command to mount the folder which we have created initially.

Create ‘u02’ folder in host using this command ‘mkdir ‘u02’
“mount -t nfs 192.168.1.XXX:/data/soa_repo /u02”

Explanation of above command –

Mount – its OS command to use to mount a folder, for more details say ‘man mount’

‘-t’ option for indicating type of file system. In this case its ‘nfs’
192.168.1.XXX – Is the IP the NAS 

Data- is the volume name on NAS under which shared folder been created. 

‘soa_repo’ is the shared folder name which we have created. 

/u02 – the local folder under which we want to mount shared NAS folder.

verify the mounted folder using ‘df –h’ option

Configuration related to auto mount a device during restart of machine/server/vServer

In most of OS there is file located under /etc directory called ‘fstab’. This file contains descriptive information about file system. ‘fstab’ file get utilized when we run mount, umount and fsck utility.
For Auto mount configuration, also this file has a parameter which need to be setup. Please add below line considering mounting ‘nfs’ file system.

fpnas:/data/soa_repos                                 /u02       nfs          defaults               0              0

In above syntax ‘default’ is the parameter which will help to auto mount.

Default represent these option - rw,suid,dev,noexec,auto,user,async

For more details check ‘man fstab’

Of this blog have detail info about fstab file.

Points to consider while uploading data from iSCSI volume to NAS volume

The points which I am going to describe here does vary from NAS drive to NAS drive. For NetGearReady NAs I have observed below –

When I copied data from local mount point to NAS mount point e.g. ‘cp –R --preserve /Local /NAS’, by mistake I did via root OS user, once data got copied into NAS drive, the ownership of all the files and folders was set to ‘nobody’ user. Now this nobody ownership if we try to change using command e.g. ‘chown –R oracle:oinstall /u02’ then it does not allow to change even from root user.

This has happened because I have copied data into NAS using root user, if you run copy command using different OS user e.g. ‘oracle’ user then the file which get transferred on NAS does maintain existing ownership but if you do via root user its change the ownership to ‘nobody’ irrespective of what parameter you are using with ‘cp’ command. If you use argument ‘--preserve’ even then also its does change ownership of the files once it get copied to NAS.

NAS has provision to create user and groups but in our case I don’t find any relation between OS user group to NAS user groups, they both are isolated to each other. 

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