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autofsd(8)							   autofsd(8)



NAME

  autofsd, autofs - Automatically and transparently mounts and unmounts	NFS
  file systems

SYNOPSIS

  /usr/sbin/autofsd [-dv] [-D name=value] [directory -null]

OPTIONS

  -d  Enables debugging. When debugging	is enabled, the	daemon does not
      disassociate itself from the current tty.	 Messages that trace autofsd
      activity are written to standard output.

  -v  Logs verbose output.

  -D name=value
      Defines an autofsd environment variable by assigning value to the	vari-
      able.

  directory -null
      Specifies	the full pathname of the mount point for an indirect map
      entry that is to be ignored.

      You must specify excluded	master map and direct map entries by using
      the autofsmount command. See Special Maps	in autofsmount(8).

DESCRIPTION

  The autofsd daemon automatically and transparently mounts and	unmounts NFS
  file systems on an as-needed basis. Like the automount daemon, it provides
  another alternative to using the /etc/fstab file for mounting	NFS file sys-
  tems on client machines. However, AutoFS is more efficient than the auto-
  mount	daemon because it requires less	communication between the kernel and
  the user space daemon.

  The autofsd daemon also provides higher availability than the	automount
  daemon. Although autofsd must	be running for mounts or unmounts to be	per-
  formed, if it	is killed or becomes unavailable, exisiting auto-mounted NFS
  file systems continue	to be available.

  The autofsd daemon can be started from the command line or from the
  /sbin/rc3.d/nfs script, which	reads the /etc/rc.config.common	file.  Once
  started, it remains dormant until a user attempts to access a	directory (or
  any file or directory	in the directory hierarchy) that is associated with
  an AutoFS map.  The daemon then consults the appropriate map and mounts the
  NFS file system as specified.

  AutoFS maps indicate where to	find the file system to	be mounted and the
  mount	options	to use.	The names of the maps are passed to the	autofsd	dae-
  mon through the autofsmount command.	For more information about AutoFS
  maps and the autofsmount command, see	autofsmount(8) and the Network
  Administration: Services manual. Also, see sys_attrs_autofs(5) for informa-
  tion on tuning AutoFS.




				     Note

       The autofsmount program reads AutoFS maps at startup.  If you make any
       changes to the maps after startup, you must execute the autofsmount
       command again to	incorporate the	changes.

  By default, AutoFS uses UDP transport.  If the tcp option is specified in a
  map, AutoFS attempts to use TCP.  If TCP is not available, AutoFS then
  reverts to UDP.

RESTRICTIONS

  There	is no support in the autofsd daemon that is analogous to the SIGTERM
  support in the automount command.

  If a file system is locally served, the autofsd daemon creates a symbolic
  link on the system instead of	NFS mounting the directory.  If	locally	serv-
  ing the directory would result in a circular link, the daemon	selects	an
  external server (if available).

SEE ALSO

  Commands: autofsmount(8), automount(8), mount(8)

  Others: sys_attrs_autofs(5)

  Network Administration: Services