nfs man page on Plan9

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NFS(4)									NFS(4)

       nfs - Sun network file system client

       nfs  [  -DRv  ]	[ -p perm ] [ -s srvname ] [ -u passwd group ] addr1 [
       addr2 ]

       aux/portmap [ -R ] host cmd

       aux/nfsmount [ -R ] host cmd

       Nfs translates between the Sun network file system protocol  (NFS)  and
       9P,  allowing  9P  clients  to  mount file systems on NFS servers.  NFS
       servers comprise two separate services: a mount service used to	obtain
       the initial file handle, and a file service used to perform actual file
       system operations.  The Sun port mapper service is  typically  used  to
       find  these  two	 services.  If one address is given, it is taken to be
       the address of a port mapper service; nfs queries the  port  mapper  to
       find  the  addresses of the NFS mount service and file service.	If two
       addresses are given, the port mapper is bypassed; addr1 is used as  the
       address	of  the NFS mount service, and addr2 is used as the address of
       the file service.

       The options are:

       -D     print all 9P messages.

       -R     print all NFS messages.

       -v     print verbose information about session startup.

       -p perm
	      set the posted service file to have mode perm, which is  assumed
	      to be octal; the default is 600.

       -s srvname
	      post the service as /srv/srvname; the default is /srv/addr1.

       -u passwd group
	      translate user and group names using the passwd and group files,
	      which are in the traditional Unix format.	  The  translation  is
	      used  to	present	 names for user and group in stat(5) and wstat
	      messages.	 The translation is also used to choose the  user  and
	      group  credentials  to present for a user.  Without this option,
	      users and groups are presented as decimal numbers, and  everyone
	      attaches as uid -1 (nobody on most Unix systems).

       Portmap	and  nfsmount are test programs to perform port mapper and NFS
       mount RPCs.  They are useful mainly to help debug problems with	start‐
       ing  nfs	 itself.   The -R option causes them to print all RPC messages
       sent and received.

       Portmap queries a Sun RPC portmap server, which maps integer  (program,
       version,	 protocol)  triples  to port numbers.  Program and version are
       Sun RPC defined, while protocol is typically TCP (6) or UDP (17).   The
       commands are:

       null   a no-op

       dump   print the entire map

       set prog vers proto port
	      add an entry to (or replace an entry in) the map

       unset prog vers proto port
	      remove an entry from the map

       getport prog vers proto
	      look  for an entry with prog, vers, proto in the map, and return
	      the corresponding port The default command is dump.  For running
	      NFS over UDP, there must be an entry for the NFS v3 mount daemon
	      (100005, 3, 17) and the NFS v3 server itself (100003, 3, 17).

       Nfsmount queries a Sun NFS  mount  server,  which  authenticates	 (ha!)
       connections  and	 hands out file handles naming the root of an exported
       file system.  This handle is used as the basis for a conversation  with
       the NFS service daemon itself.  The commands are:

       null   a no-op

       export dump the export table; each line is a path followed by a list of
	      machines or groups allowed to mount that path

       mnt path
	      attempt to acquire a file handle for path.  the request has user
	      and group id 1001 and as the system name.

       umnt path
	      notify  the  mount  daemon  that	a  particular  path  is	 being
	      unmounted by the requesting system

	      notify the mount daemon that all paths mounted by the requesting
	      system are being unmounted

       dump   should also dump an export table, but typically does nothing

       We use this in our /rc/bin/9fs script to mount all the home directories
       served by bopp:

	      case bopp
		   if(! test -f /srv/bopp)
			nfs -p 666 -u /lib/ndb/1127.passwd /lib/ndb/ bopp
		   unmount /n/bopp >[2]/dev/null
		   for(i in u0 u1 u2 u3 u4 u5 u6 u7 u8 u9)
			mount -a /srv/bopp /n/bopp /$i


       nfsserver(8), srv(4)

       The authentication employed by NFS is  laughable.   The	server	simply
       trusts the uid, gid, and group list presented by the client.

       Nfs  speaks only NFS version 3.	Older operating systems typically have
       reasonable NFS version 2 servers but crash when serving version 3.

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