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exports(5nfs)							 exports(5nfs)

       exports - defines NFS file systems to be exported


       The  file  describes the local file systems and directories that can be
       mounted by remote hosts through the use of the NFS protocol.  The  file
       can  also be used to restrict access to a particular set of remote sys‐
       tems.  The request daemon accesses the file each	 time  it  receives  a
       mount request from an NFS client.

       Each entry in the file consists of a file system or directory name fol‐
       lowed by an optional list of options or an optional list of identifiers
       or  both. The identifiers define which remote hosts can mount that par‐
       ticular file system or directory.  The identifiers  listed  beside  the
       name  of	 each  file system or directory can be either host names or YP
       netgroups names.	 When the daemon  receives  a  mount  request  from  a
       client,	it  searches  for a match in the list of identifiers, first by
       checking the client host name with the host name identifiers and second
       by  checking  the  client host name in a YP netgroups.  When it finds a
       match, makes that file system or directory available to the  requesting

       The exports file format is defined as follows:
       pathname [-r=#] [-o] [identifier_1 identifier_2 ... identifier_n]

       Name of a mounted local file system or a directory of a
		      mounted local file system . The must begin in column 1.


		      -r=#    Map  client  superuser  access to uid #.	If you
			      want to allow client superusers  access  to  the
			      file  system  or directory with the same permis‐
			      sions as a local superuser, use Use only if  you
			      trust  the  superuser on the client system.  The
			      default is which	maps  a	 client	 superuser  to
			      nobody.	This  limits  access to world readable

		      -o      Export file system or directory read-only.

			      The options can be applied to both  file	system
			      and directory entries in

       identifiers:   Host  names  or  netgroups,  or both, separated by white
		      space, that specify the access  list  for	 this  export.
		      Host  names can optionally contain the local BIND domain
		      name.  For more information on BIND, see	the  Guide  to
		      the  BIND/Hesiod	Service	 If  no hosts or netgroups are
		      specified, the daemon exports this file system or direc‐
		      tory to anyone requesting it.

       A  number sign (#) anywhere in the line marks a comment that extends to
       the end of that line.

       A whitespace character in the left-most position of a line indicates  a
       continuation line.

       Each  file  system  that	 you  want  to	allow clients to mount must be
       explicitly defined.  Exporting only the root (/) will not allow clients
       to mount Exporting only will not allow clients to mount if it is a file

       Duplicate directory entries are not allowed.  The first entry is	 valid
       and following duplicates are ignored.

       Desired	export	options must be explicitly specified for each exported
       resource: file system or directory.  If a file system  and  subdirecto‐
       ries  within it are exported, the options associated with the file sys‐
       tem are not ``inherited''.  You do not need to export  an  entire  file
       system to allow clients to mount subdirectories within it.

       The access list associated with each exported resource identifies which
       clients can mount that resource with the specified options.  For	 exam‐
       ple,  you  can export an entire file system read-only, with a subdirec‐
       tory within it exported read-write to a subset of clients.  If a client
       that  is	 not  identified  in  the  export  access  list of a directory
       attempts to mount it,  then  access  is	checked	 against  the  closest
       exported ancestor.  If mount access is allowed at a higher level in the
       directory tree of the file system, the export options  associated  with
       the successful match will be in effect.

       If  you	are concerned with nfs security, all ufs file systems exported
       via nfs should be ufs mounted with the option.  All  ufs	 file  systems
       exported	 via  nfs  with the option specified in the file should be ufs
       mounted with the option.

       /usr alpha beta	       # export /usr to hosts alpha and beta, client
				 superuser maps to uid -2 and read-write
				 access is permitted

       /usr/staff/doe clients  # export directory to hosts in netgroup clients

       /usr/man/man1 -o	       # export directory read-only to everyone

       /usr/local -r=0 beta    # export file system to beta, superuser
				 on beta maps to local superuser (uid=0)

See Also
       hosts(5), mountd(8nfs), netgroup(5yp)
       Guide to the BIND/Hesiod Service
       Introduction to Networking and Distributed System Services


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