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Commands Reference, Volume 2
Exports and unexports directories
to NFS clients.
/usr/sbin/exportfs [ -a ] [
-v ] [ -u
] [ -i ] [ -fFile ] [ -oOption [
,Option ... ] ] [
Directory ]
The exportfs command
makes local directories available for Network File System (NFS) clients to
mount. This command is normally invoked during system startup by the
/etc/rc.nfsfile and uses information in the /etc/exports file to export one or more directories,
which must be specified with full path names.
The /etc/xtab file
lists directories that are currently exported. To display this file,
enter the exportfs command without flags or arguments. To
alter the file or to alter the characteristics of one of its directories, root
users can edit the /etc/exports file and run the
exportfs command. Such alterations can be done at any
time. Never edit the /etc/xtab file directly.
Note: You cannot export a directory that is either a parent
directory or a subdirectory of one that is currently exported and within the
same file system.
-a
| Exports all directories listed in the /etc/exports
file.
|
-v
| Prints the name of each directory as it is exported or unexported.
|
-u
| Unexports the directories you specify. When used with the
-a flag, unexports all directories listed in the
/etc/exports file.
|
-i
| Allows the exporting of directories not specified in the exports file or
ignores the options in the /etc/exports file. Normally the
exportfscommand consults the /etc/exports file for the
options associated with the exported directory.
|
-f File
| Specifies an export file, other than the /etc/exports file,
that contains a list of directories that you can export. This file
should follow the same format as the /etc/exports file.
NOTE: This alternate file will not be used for exporting directories
automatically when the system and NFS is started. The
/etc/exports file is the only file that is supported for specifying
directories to export at system start.
|
-oOptions
| Specifies optional characteristics for the exported directory. You
can enter more than one variable by separating them with commas. Choose
from the following options:
- ro
- Exports the directory with read-only permission. Otherwise, if not
specified, the directory is exported with read-write permission.
- rw = Client
[:Client]
- Exports the directory with read-write permission to the machines specified
by the Client parameter and read-only to all others. The
Client parameter can be either the host name or the network
name. If a rw host name is not specified, the directory is
exported with read-write permission to all.
- anon = UID
- Uses the UID value as the effective user ID, if a request comes
from a root user.
The default value for this option is -2. Setting the value of the
anon option to -1 disables anonymous access. Thus, by
default, secure NFS accepts nonsecure requests as anonymous, and users who
want more security can disable this feature by setting anon to a
value of -1.
- root =
HostName[:HostName,...]
- Gives root access only to the root users from the specified
HostName. The default is for no hosts to be granted root
access.
- access =
Client[:Client,...]
- Gives mount access to each client listed. A client can be either a
host name or a net group name. Each client in the list is first checked
for in the /etc/netgroup database and then in the
/etc/hosts database. The default value allows any machine to
mount the given directory.
- secure
- Requires clients to use a more secure protocol when accessing the
directory.
- public
- Specifies a directory as the NFS Server public directory. This
option only applies to AIX 4.2.1.
|
- To export all directories in
the /etc/exports file, enter:
exportfs -a
- To export one directory from
the /etc/exports file, enter:
exportfs /home/notes
In this example, the /home/notes directory is exported.
Note: For this
command to work, the /home/notes directory must be specified in the
/etc/exports file.
- To unexport a directory,
enter:
exportfs -u /home/notes
In this example, the /home/notes directory is unexported.
- To display the name of the
directory currently being exported, enter:
exportfs -v
- To export a directory that
is not specified in the /etc/exports file, enter:
exportfs -i /home/zeus
In this example, the /home/zeus directory is exported without
restrictions.
- To export a directory and
give netgroup members permission to access this directory, enter:
exportfs access=cowboys:oilers /home/notes -o
In this example, the /home/notes directory is exported and
permits users of cowboys and oilers host machines to
have access.
- To export a directory with
different options from the /etc/exports file, enter:
exports -i -o -root=zorro:silver /directory
In this example, the /directory directory is exported and allows
root user access to zorro and silver host machines,
regardless of the access permissions specified in the /etc/exports
file.
/etc/exports
| Lists the directories that the server can export.
|
/etc/xtab
| Lists currently exported directories.
|
/etc/hosts
| Contains an entry for each host on the network.
|
/etc/netgroup
| Contains information about each user group on the network.
|
/etc/rc.nfs
| Contains the startup script for the NFS and NIS daemons.
|
The chnfsexp command, mknfsexp command, rmnfsexp command, showmount command.
How to Export a
File System Using Secure NFS in AIX 5L Version 5.1 System
Management Guide: Communications and Networks.
List of NFS Commands and List of
NFS Files.
Network File
System (NFS) Overview for System Management in AIX 5L Version
5.1 System Management Guide: Communications and
Networks.
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