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NFS(4)                     Kernel Interfaces Manual                     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 un‐
              mounted 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.