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.\" Copyright (C) 1995 Olaf Kirch <okir@monad.swb.de>
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.\" Modifications 1999-2003 Neil Brown <neilb@cse.unsw.edu.au>
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.TH exportfs 8 "18 July 2003"
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exportfs \- maintain list of NFS exported file systems
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.BI "/usr/sbin/exportfs [-avi] [-o " "options,.." "] [" "client:/path" " ..]
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.BI "/usr/sbin/exportfs -r [-v]"
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.BI "/usr/sbin/exportfs [-av] -u [" "client:/path" " ..]
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.BI "/usr/sbin/exportfs [-v]
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.BI "/usr/sbin/exportfs -f"
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command is used to maintain the current table of exported file systems for
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NFS. This list is kept in a separate file named
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when a remote host requests access to mount a file tree, and parts of
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the list which are active are kept in the kernel's export table.
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file is initialized with the list of all file systems named in
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However, administrators can choose to add and delete individual file systems
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and it's partner program
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work in one of two modes, a legacy mode which applies to 2.4 and
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earlier versions of the Linux kernel, and a new mode which applies to
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2.6 and later versions providing the
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virtual filesystem has been mounted at
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If this filesystem is not mounted in 2.6, the legacy mode is used.
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does not give any information to the kernel but only provides it to
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will listen to requests from the kernel and will provide information
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any export requests which identify a specific host (rather than a
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subnet or netgroup etc) are entered directly into the kernel's export
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table as well as being written to
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.BR /var/lib/nfs/xtab .
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Further, any mount points listed in
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which match a non host-specific export request will cause an
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appropriate export entry for the host given in
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into the kernel's export table.
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Export or unexport all directories.
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Specify a list of export options in the same manner as in
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file, so that only default options and options given on the command
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Reexport all directories. It synchronizes /var/lib/nfs/xtab
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with /etc/exports. It removes entries in /var/lib/nfs/xtab
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which are deleted from /etc/exports, and remove any entries from the
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kernel export table which are no longer valid.
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Unexport one or more directories.
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In 'new' mode, flush everything out of the kernels export table. Any
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clients that are active will get new entries added by
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when they make their next request.
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Be verbose. When exporting or unexporting, show what's going on. When
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displaying the current export list, also display the list of export
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.\" -------------------- Exporting Directories --------------------
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.SS Exporting Directories
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The first synopsis shows how to invoke the command when adding new
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entries to the export table. When using
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and the resulting list is pushed into the kernel.
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argument specifies the directory to export along with the host or hosts to
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export it to. All formats described in
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are supported; to export a directory to the world, simply specify
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The export options for a particular host/directory pair derive from
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several sources. There is a set of default options which can be overridden by
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In addition, the administrator may overide any options from these sources
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argument which takes a comma-separated list of options in the same fashion
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as one would specify them in
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can also be used to modify the export options of an already exported
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Modifications of the kernel export table used by
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take place immediately after parsing the command line and updating the
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The default export options are
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.BR sync,ro,root_squash,no_delay .
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.\" -------------------- Unexporting Directories ------------------
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.SS Unexporting Directories
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The third synopsis shows how to unexported a currently exported directory.
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all entries listed in
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are removed from the kernel export tables, and the file is cleared. This
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effectively shuts down all NFS activity.
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To remove individial export entries, one can specify a
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pair. This deletes the specified entry from
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and removes the corresponding kernel entry (if any).
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.\" -------------------- Dumping the Export Table -----------------
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.SS Dumping the Export Table
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without further options shows the current list of exported file systems.
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option, the list of flags pertaining to each export are shown in addition.
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.\" -------------------- EXAMPLES ---------------------------------
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The following adds all directories listed in
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.B /etc/exports to /var/lib/nfs/xtab
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and pushes the resulting export entries into the kernel:
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allowing asynchronous writes, one would do this:
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.B "# exportfs -o async django:/usr/tmp
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.\" -------------------- DEPENDENCIES -----------------------------
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Exporting to IP networks, DNS and NIS domains does not enable clients
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from these groups to access NFS immediately; rather, these sorts of
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to grant any mount requests from these clients.
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This is usually not a big problem, because any existing mounts are preserved
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When unexporting a network or domain entry, any current exports to members
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of this group will be checked against the remaining valid exports and
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if they themselves are nolonger valid they will be removed.
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.\" -------------------- SEE ALSO --------------------------------
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.BR exports(5) ", " mountd(8)
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.\" -------------------- AUTHOR ----------------------------------
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Olaf Kirch, <okir@monad.swb.de>
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Neil Brown, <neilb@cse.unsw.edu.au>
added
removed
utils/exportfs/exportfs.man
