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NOTE: CentOS Enterprise Linux 5 is built from the Red Hat Enterprise Linux source code. Other than logo and name changes CentOS Enterprise Linux 5 is compatible with the equivalent Red Hat version. This document applies equally to both Red Hat and CentOS Enterprise Linux 5.

18.2. NFS Client Configuration

NFS shares are mounted on the client side using the mount command. The format of the command is as follows:

mount -t <nfs-type> -o <options> <host>:</remote/export> </local/directory>

Replace <nfs-type> with either nfs for NFSv2 or NFSv3 servers, or nfs4 for NFSv4 servers. Replace <options> with a comma separated list of options for the NFS file system (refer to Section 18.4, “Common NFS Mount Options” for details). Replace <host> with the remote host, </remote/export> with the remote directory being mounted, and </local/directory> with the local directory where the remote file system is to be mounted.

Refer to the mount man page for more details.

If accessing an NFS share by manually issuing the mount command, the file system must be remounted manually after the system is rebooted. Red Hat Enterprise Linux offers two methods for mounting remote file systems automatically at boot time: the /etc/fstab file or the autofs service.

18.2.1. Mounting NFS File Systems using /etc/fstab

An alternate way to mount an NFS share from another machine is to add a line to the /etc/fstab file. The line must state the hostname of the NFS server, the directory on the server being exported, and the directory on the local machine where the NFS share is to be mounted. You must be root to modify the /etc/fstab file.

The general syntax for the line in /etc/fstab is as follows:

server:/usr/local/pub    /pub   nfs    rsize=8192,wsize=8192,timeo=14,intr

The mount point /pub must exist on the client machine before this command can be executed. After adding this line to /etc/fstab on the client system, type the command mount /pub at a shell prompt, and the mount point /pub is mounted from the server.

The /etc/fstab file is referenced by the netfs service at boot time, so lines referencing NFS shares have the same effect as manually typing the mount command during the boot process.

A sample /etc/fstab line to mount an NFS export looks like the following example:

<server>:</remote/export> </local/directory> <nfs-type> <options> 0 0

Replace <server> with the hostname, IP address, or fully qualified domain name of the server exporting the file system.

Replace </remote/export> with the path to the exported directory.

Replace </local/directory> with the local file system on which the exported directory is mounted. This mount point must exist before /etc/fstab is read or the mount fails.

Replace <nfs-type> with either nfs for NFSv2 or NFSv3 servers, or nfs4 for NFSv4 servers.

Replace <options> with a comma separated list of options for the NFS file system (refer to Section 18.4, “Common NFS Mount Options” for details). Refer to the fstab man page for additional information.


 
 
  Published under the terms of the GNU General Public License Design by Interspire