Connecting Clients Via NFS
Setting
up a client to use NFS is relatively simple when you have the NFS server in place.
Let’s set up the Client01 system to use a share on the RHEL01 NFS server.
Sallar
RedhatEnterpriseLinux Blog
Installing and configring nfs-server step by step part 3
NFSD Firewall and SELinux
Configuration
NFS
is one of the many Red Hat services that can take advantage of TCP Wrappers as
well as firewall rules for security. We don’t use TCP Wrappers here, but should
you run into trouble on the exam with the NFS service not working, don’t forget
to check to see whether anything is being filtered by TCP Wrappers. Because you
are using NFS version 4 here, you need to create only a single firewall rule.
Installing and configring nfs-server step by step part 2
Now export the file to network
If
you already started the services before creating an /etc/exports file, you can
also use the exportfs command to manually export any new resources added to the
/etc/exports file.
Syntax:
exportfs [options]
Options:
Installing and Configring NFS Server step by step Part 1
Installing and Configring NFS Server step by
step
Follow
these steps to install an NFS server.
Step 1. To begin the NFS server setup, install the required packages:
#
yum install -y nfs-utils nfs4-acl-tools
Step 2. Verify the package installation:
#
rpm -qa | grep nfs
nfs4-acl-tools-0.3.3-5.el6.x86_64
nfs-utils-1.2.2-7.el6.x86_64
nfs-utils-lib-1.1.5-1.el6.x86_64
Samba Server Configuration
Samba File Sharing
Samba
is the file-sharing protocol used by the Microsoft Windows operating system. Because
some network environments include more than one operating system, Red Hat Enterprise
Linux provides a way to use alternative file-sharing methods. If only sharing between
Linux and other UNIX variants, it is recommended that NFS be used instead. For
additional information on Samba, refer to the
/usr/share/doc/samba-<version>/ directory.
Connecting & Mounting to the NFS Share Folders
Connecting to the NFS Share
Folders
There
are three ways to mount an NFS export on a client system, assuming the server
has given the client permission to do so:
1.
Use the mount
command along with the server name, exported directory, and local mount point.
2.
Add the
export to /etc/fstab so it is automatically mounted at boot time or is Available
to be mounted.
3.
Use the
autofs service to mount the share when a user attempts to access it from a client.
Configuring the NFS Server on the Command Line
To
configure a Red Hat Enterprise Linux system as an NFS server via the command
line, make sure the nfs-utils RPM package is installed.
The
server configuration file, /etc/exports, uses the following format:
shared_directory
allowed_hosts(options)
where
shared_directory is the name of the directory to be shared, allowed_hosts is
the IP address range of the allowed clients, and options is a list of NFS
options for the exported directory. Obviously, the exported directory must
exist. You must be root to modify this file.
NFS and SELinux Configuration
NFS and SELinux
In
Red Hat Enterprise Linux 5 & 6, NFS is protected by the default
Security-Enhanced Linux (SELinux) policy, known as the targeted policy. By
default, this targeted policy allows NFS connections to the server by setting
the nfs_export_all_ro and nfs_export_all_rw SELinux booleans to 1.
If
you are sharing home directories over NFS while using SELinux, you must set
use_nfs_home_dirs
boolean to 1 on each client connecting to the NFS server sharing the home
directories. Execute the following command as root:
What is NFS server
Network File Sharing
In
an enterprise computing environment, it is common to share files between
computers or allow several users to access the same set of files on a central
server and have all changes be visible to all users immediately. In a pure UNIX
environment, including those consisting solely of Red Hat Enterprise Linux
systems, this can be achieved via Network File System (NFS). If sharing files
between Red Hat Enterprise Linux and Microsoft Windows systems is desired,
Samba can be used to achieve connectivity.
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