Red Hat ENTERPRISE LINUX 4.5.0 Reference Manual page 161

• — Causes the NFS server to delay writing to the disk if it suspects another write
wdelay
request is imminent. This can improve performance by reducing the number of times the disk
must be accessed by separate write commands, reducing write overhead. The
option turns off this feature, but is only available when using the
• — Prevents root users connected remotely from having root privileges and
root_squash
assigns them the user ID for the user
remote root user to the lowest local user, preventing unauthorized alteration of files on the
remote server. Alternatively, the
every remote user, including root, use the
IDs to use with remote users from a particular host, use the
respectively. In this case, a special user account can be created for remote NFS users to
share and specify
(anonuid=<uid-value>,anongid=<gid-value>)
the user ID number and
Important
By default, access control lists (ACLs) are supported by NFS under Red Hat
Enterprise Linux. To disable this feature, specify the
exporting the file system. For more about this feature, refer to the chapter titled
Network File System (NFS) in the Red Hat Enterprise Linux System
Administration Guide.
Each default for every exported file system must be explicitly overridden. For example, if the
option is not specified, then the exported file system is shared as read-only. The following is a
sample line from
/etc/exports
/another/exported/directory 192.168.0.3(rw,sync)
In this example
192.168.0.3
transfers to disk are committed to the disk before the write request by the client is completed.
Additionally, other options are available where no default value is specified. These include the
ability to disable sub-tree checking, allow access from insecure ports, and allow insecure file
locks (necessary for certain early NFS client implementations). Refer to the
for details on these lesser used options.
Warning
The format of the
of the space character. Remember to always separate exported file systems
from hosts and hosts from one another with a space character. However, there
should be no other space characters in the file except on comment lines.
nfsnobody
no_root_squash
all_squash
is the group ID number.
<gid-value>
which overrides two default options:
can mount
/another/exported/directory/
file is very precise, particularly in regards to use
/etc/exports
The
/etc/exports
option.
sync
. This effectively "squashes" the power of the
option turns off root squashing. To squash
option. To specify the user and group
and
anonuid
, where
no_acl
Configuration File
no_wdelay
options,
anongid
is
<uid-value>
option when
rw
read/write and all
man page
exports
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