NFS, or Network File System,
is a server-client protocol for sharing files between computers on a
common network. NFS enables you to mount a file system on a remote
computer as if it were local to your own system. You can then directly
access any of the files on that remote file system. The server and
client do not have to use the same operating system. The client system
just needs to be running an NFS client compatible with the NFS server.
For example NFS server
could be a Linux system and Unix could be a client. But it can’t be a
window system because window is not NFS compatible. The NFS server
exports one or more directories to the client systems, and the client
systems mount one or more of the shared directories to local directories
called mount points. After the share is mounted, all I/O operations are
written back to the server, and all clients notice the change as if it
occurred on the local filesystem.
A manual refresh is not needed
because the client accesses the remote filesystem as if it were
local.because access is granted by IP address, a username and password
are not required. However, there are security risks to consider because
the NFS server knows nothing about the users on the client system.
Exam question 1 Some users home directory is shared from your system. Using showmount -e localhost command, the shared directory is not shown. Make access the shared users home directory
Exam question 2 The System you are using is for NFS (Network File Services). Some important data are shared from your system. Make automatically start the nfs and portmap services at boot time
Exam question 3 Share /data directory using NFS only to 192.168.0.0/24 members. These hosts should get read and write access on shared directory.
Configure NFS Server
In this example we will configure a nfs server and will mount shared directory from client side.For this example we are using two systems one linux server one linux clients . To complete these per quest of nfs server Follow this link
Network configuration in Linux
- A linux server with ip address 192.168.0.254 and hostname Server
- A linux client with ip address 192.168.0.1 and hostname Client1
- Updated /etc/hosts file on both linux system
- Running portmap and xinetd services
- Firewall should be off on server
Now check nfs, portmap, xinetd service in system service it should be on
#setup
Select System service
from list
[*]portmap [*]xinetd [*]nfs
To keep on these services after reboot on then via chkconfig command
After reboot verify their status. It must be in running condition
now create a /data directory and grant full permission to it
now open /etc/exports file
share data folder for the network of 192.168.0.254/24 with read and write access
save file with :wq and exit
now restart the nfs service and also on it with chkconfig
also restart nfs daemons with expotfs
verify with showmount command that you have successfully shared data folder
Configure Client System
ping form nfs server and check the share folder
now mount this share folder on mnt mount point. To test this share folder change directory to mnt and create a test file
After use you should always unmount from mnt mount point
In this way you can use shared folder. But this share folder will be available till system is up. It will not be available after reboot. To keep it available after reboot make its entry in fstab
create a mount point, by making a directory
now open /etc/fstab file
make entry for nfs shared directory and define /temp to mount point
save the with :wq and exit reboot the system with reboot -f command
#reboot -f
No comments:
Post a Comment