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           /usr/sbin/exportfs [-avi] [-o options,..] [client:/path ..]
           /usr/sbin/exportfs -r [-v]
           /usr/sbin/exportfs [-av] -u [client:/path ..]
           /usr/sbin/exportfs [-v]
           /usr/sbin/exportfs -f


           An NFS server maintains a table of local physical file systems that are
           accessible to NFS clients.  Each file system in this table is  referred
           to as an exported file system, or export, for short.
           The exportfs command maintains the current table of exports for the NFS
           server.   The  master  export  table  is   kept   in   a   file   named
           /var/lib/nfs/etab.  This file is read by rpc.mountd when a client sends
           an NFS MOUNT request.
           Normally the master export table is initialized with  the  contents  of
           /etc/exports  and  files  under /etc/exports.d by invoking exportfs -a.
           However, a system administrator can choose to  add  or  delete  exports
           without  modifying  /etc/exports or files under /etc/exports.d by using
           the exportfs command.
           exportfs and its partner program rpc.mountd work in one of two modes: a
           legacy mode which applies to 2.4 and earlier versions of the Linux ker-
           nel, and a new mode which applies to 2.6 and later versions,  providing
           the  nfsd  virtual  filesystem  has  been  mounted  at /proc/fs/nfsd or
           /proc/fs/nfs.  On 2.6 kernels, if this filesystem is not  mounted,  the
           legacy mode is used.
           In  the new mode, exportfs does not give any information to the kernel,
           but provides it only to rpc.mountd through the /var/lib/nfs/etab  file.
           rpc.mountd  then manages kernel requests for information about exports,
           as needed.
           In the legacy mode, exports which identify a specific host, rather than
           a subnet or netgroup, are entered directly into the kernel's export ta-
           ble, as well as being written to /var/lib/nfs/etab.   Further,  exports
           listed  in  /var/lib/nfs/rmtab  which  match a non host-specific export
           request will cause an appropriate export entry for the  host  given  in
           rmtab to be added to the kernel's export table.


           -a     Export or unexport all directories.
           -o options,...
                  Specify  a  list  of  export  options  in  the same manner as in
           -i     Ignore the /etc/exports  file  and  files  under  /etc/exports.d
                  directory.   Only  default options and options given on the com-
                  mand line are used.
           -v     Be verbose. When exporting or unexporting, show what's going on.
                  When  displaying  the current export list, also display the list
                  of export options.


       Exporting Directories
           The first synopsis shows how to invoke exportfs when adding new entries
           to  the  export  table.   When using exportfs -a, all exports listed in
           /etc/exports   and   files   under   /etc/exports.d   are   added    to
           /var/lib/nfs/etab.   The  kernel's  export  table  is  also  updated as
           The host:/path argument specifies a local directory  to  export,  along
           with  the  client  or  clients  who  are  permitted  to access it.  See
           exports(5) for a description of supported options and access list  for-
           mats.  To export a directory to the world, simply specify :/path.
           The  export  options  for  a particular host/directory pair derive from
           several    sources.      The     default     export     options     are
           sync,ro,root_squash,wdelay.   These  can  be  overridden  by entries in
           /etc/exports or files under /etc/exports.d.
           A system administrator may override options from  these  sources  using
           the -o command-line option on exportfs.  This option takes a comma-sep-
           arated list of options in the same fashion as one would specify them in
           /etc/exports.   In  this  way exportfs can be used to modify the export
           options of an already exported directory.
       Unexporting Directories
           The third synopsis shows how to unexported a currently exported  direc-
           tory.  When using exportfs -ua, all entries listed in /var/lib/nfs/etab
           are removed from the kernel export tables, and  the  file  is  cleared.
           This effectively shuts down all NFS activity.
           To remove an export, specify a host:/path pair. This deletes the speci-
           fied entry from /var/lib/nfs/etab and removes the corresponding  kernel
           entry (if any).
       Dumping the Export Table
           Invoking  exportfs  without  options shows the current list of exported
           file systems.  Adding the -v option  causes  exportfs  to  display  the
           export options for each export.


           The  following  adds  all  directories listed in /etc/exports and files
           under /etc/exports.d to  /var/lib/nfs/etab  and  pushes  the  resulting
           export entries into the kernel:
           # exportfs -a
           To export the /usr/tmp directory to host django, allowing insecure file
           Exporting to IP networks or DNS and NIS domains does not enable clients
           from these groups to access NFS immediately.  Rather,  these  sorts  of
           exports  are  hints  to  rpc.mountd(8) to grant any mount requests from
           these clients.  This is usually not a  problem,  because  any  existing
           mounts are preserved in rmtab across reboots.
           When unexporting a network or domain entry, any current exports to mem-
           bers of this group will be checked against the remaining valid  exports
           and if they themselves are no longer valid they will be removed.


           /etc/exports             input  file  listing  exports, export options,
                                    and access control lists
           /etc/exports.d           directory where extra input files are  stored.
                                    Note:  only  files  that end with .exports are
           /var/lib/nfs/etab        master table of exports
           /var/lib/nfs/rmtab       table of clients accessing server's exports


           exports(5), rpc.mountd(8), netgroup(5)


           Olaf Kirch <>
           Neil Brown <>
                                   31 December 2009                    exportfs(8)

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