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10.2. NFS Client Configuration

The mount command mounts NFS shares on the client side. Its format is as follows:
mount -t nfs -o options host:/remote/export /local/directory
This command uses the following variables:
options
A comma-delimited list of mount options; refer to Section 10.4, “Common NFS Mount Options” for details on valid NFS mount options.
server
The hostname, IP address, or fully qualified domain name of the server exporting the file system you wish to mount
/remote/export
The file system / directory being exported from server, i.e. the directory you wish to mount
/local/directory
The client location where /remote/export should be mounted
The NFS protocol version used in Red Hat Enterprise Linux 6 is identified by the mount options nfsvers or vers. By default, mount will use NFSv4 with mount -t nfs. If the server does not support NFSv4, the client will automatically step down to a version supported by the server. If you use the nfsvers/vers option to pass a particular version not supported by the server, the mount will fail. The file system type nfs4 is also available for legacy reasons; this is equivalent to running mount -t nfs -o nfsvers=4 host:/remote/export /local/directory.
Refer to man mount for more details.
If an NFS share was mounted manually, the share will not be automatically mounted upon reboot. Red Hat Enterprise Linux offers two methods for mounting remote file systems automatically at boot time: the /etc/fstab file and the autofs service. Refer to Section 10.2.1, “Mounting NFS File Systems using /etc/fstab and Section 10.3, “autofs for more information.

10.2.1. 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, use the command mount /pub, 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 valid /etc/fstab entry to mount an NFS export should contain the following information:
server:/remote/export /local/directory nfs options 0 0
The variables server, /remote/export, /local/directory, and options are the same ones used when manually mounting an NFS share. Refer to Section 10.2, “NFS Client Configuration” for a definition of each variable.

Note

The mount point /local/directory must exist on the client before /etc/fstab is read. Otherwise, the mount will fail.
For more information about /etc/fstab, refer to man fstab.

 
 
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