automount - manage autofs mount points


   automount [options] [master_map]


   The  automount  program  is used to manage mount points for autofs, the
   inlined  Linux   automounter.    automount   works   by   reading   the
   auto.master(5)  map  and  sets  up  mount  points for each entry in the
   master map allowing them to be automatically mounted when accessed. The
   file  systems  are  then  automatically  umounted  after  a  period  of


   -h, --help
          Print brief help on program usage.

   -p, --pid-file
          Write the pid of the daemon to the specified file.

   -t <seconds>, --timeout <seconds>
          Set the global minimum timeout, in  seconds,  until  directories
          are unmounted. The default is 10 minutes. Setting the timeout to
          zero disables umounts completely.  The internal program  default
          is 10 minutes, but the default installed configuration overrides
          this and sets the timeout to 5 minutes  to  be  consistent  with
          earlier autofs releases.

   -n <seconds>, --negative-timeout <seconds>
          Set  the  default  timeout  for  caching failed key lookups. The
          default is 60 seconds.

   -v, --verbose
          Enables logging of general status and progress messages for  all
          autofs managed mounts.

   -d, --debug
          Enables  logging of general status and progress messages as well
          as debugging messages for all autofs managed mounts.

   -Dvariable=value, --define variable=value
          Define a global macro substitution variable. Global  definitions
          are  over-ridden macro definitions of the same name specified in
          mount entries.

   -f, --foreground
          Run the daemon in the foreground and log to  stderr  instead  of

   -r, --random-multimount-selection
          Enables  the use of ramdom selection when choosing a host from a
          list of replicated servers.

   -m, --dumpmaps [<map type> <map name>]
          With  no  parameters,  list  information  about  the  configured
          automounter maps, then exit.

          If  the  dumpmaps  option  is  given  and  is  followed  by  two
          parameters, "<map type> <map name>" then simple  "<key,  value>"
          pairs  that would be read in by a map read are printed to stdout
          if the given map  type  and  map  name  are  found  in  the  map

          If the map is an LDAP map and there is more than one map of same
          name in different base dns only the  first  map  encountered  by
          autofs  will  be listed. Similarly, if the map is a file map and
          there is more than  one  map  of  the  same  name  in  different
          directories, only the first map encountered will be listed.

          If the map type is an old style multi-map and any one of the map
          names in the multi-map entry matches  the  given  map  name  the
          entries  that  would  be  used by autofs for the whole multi-map
          will be listed.

   -O, --global-options
          Allows the specification of global mount options  used  for  all
          master  map  entries.  These  options  will either replace or be
          appened to options given in a master map entry depending on  the
          APPEND_OPTIONS configuration setting.

   -V, --version
          Display the version number, then exit.

   -l, --set-log-priority priority path [path,...]
          Set  the  daemon  log  priority  to  the specified value.  Valid
          values include the numbers 0-7, or  the  strings  emerg,  alert,
          crit, err, warning, notice, info, or debug. Log level debug will
          log everything, log levels info, warn (or  warning),  or  notice
          with enable the daemon verbose logging. Any other level will set
          basic logging. Note that enabling debug or  verbose  logging  in
          the  autofs global configuration will override dynamic log level
          changes.  For  example,  if  verbose  logging  is  set  in   the
          configuration  then  attempting to set logging to basic logging,
          by using alert, crit,  err  or  emerg  won't  stop  the  verbose
          logging.   However,  setting  logging  to  debug  will  lead  to
          everything (debug logging) being logged witch can then  also  be
          disabled,  returning  the daemon to verbose logging. This option
          can be specified to change the logging priority  of  an  already
          running automount process.

   The path argument corresponds to the automounted path name as specified
   in the master map.

   -C, --dont-check-daemon
          Don't check if the daemon is currently running (see NOTES).

   -F, --force
          Force an unlink umount of existing mounts under  autofs  managed
          mount  points  during  startup.  This  can  cause  problems  for
          processes with working  directories  within  these  mounts  (see


   automount  takes  one  optional argument, the name of the master map to

          Location for autofs master map that defines autofs managed mount
          points  and  the  mount  maps  they  will  use.  The  default is


   If the automount daemon catches a  USR1  signal,  it  will  umount  all
   currently  unused  autofs  managed  mounted  file  systems and continue
   running (forced expire).  If it catches the TERM signal it will  umount
   all unused autofs managed mounted file systems and exit if there are no
   remaining busy file systems. If  autofs  has  been  compiled  with  the
   option  to  ignore  busy  mounts  on exit it will exit leaving any busy
   mounts in place otherwise busy file systems will not  be  umounted  and
   autofs  will not exit.  Alternatively, if autofs has been compiled with
   the option to enable forced shutdown then a USR2 signal to  the  daemon
   will cause all mounts to be umounted and any busy mounts to be forcibly
   umounted, including autofs mount point directories (summary execution).
   Note  that  the  forced  umount  is  an unlink operation and the actual
   umount will not happen in the kernel  until  active  file  handles  are
   released.   The  daemon also responds to a HUP signal which triggers an
   update of the maps for each mount point.

   If any autofs mount point directories are busy when the daemon is  sent
   an  exit  signal  the daemon will not exit. The exception to this is if
   autofs has been built with configure  options  to  either  ignore  busy
   mounts  at  exit  or force umount at exit. If the ignore busy mounts at
   exit option is used the filesystems will be left in a  catatonic  (non-
   functional) state and can be manually umounted when they become unused.
   If the force umount at exit option is  used  the  filesystems  will  be
   umounted  but  the  mount will not be released by the kernel until they
   are no longer in  use  by  the  processes  that  held  them  busy.   If
   automount  managed filesystems are found mounted when autofs is started
   they will be recovered unless they are no longer present in the map  in
   which case they need to umounted manually.

   If  the  option  to  disable  the check to see if the daemon is already
   running is used  be  aware  that  autofs  currently  may  not  function
   correctly  for  certain  types  of  automount  maps.  The mounts of the
   separate daemons might interfere with one another. The implications  of
   running multiple daemon instances needs to be checked and tested before
   we can say this is supported.

   If the option to force an unlink of mounts  at  startup  is  used  then
   processes  whose  working  directory  is  within  unlinked  automounted
   directories will not get the correct  pwd  from  the  system.  This  is
   because, after the mount is unlinked from the mount tree, anything that
   needs to walk back up the mount tree  to  construct  a  path,  such  as
   getcwd(2)  and the proc filesystem /proc/<pid>/cwd, cannot work because
   the point from which the path is constructed has been detached from the
   mount tree.


   autofs(5),   autofs(8),   autofs.conf(5),   auto.master(5),   mount(8).


   Don't know, I've fixed everything I know about.

   The documentation could be better.

   Please  report  other  bugs  along  with  a  detailed  description   to
   <>.       Visit
   lists.html#autofs for information about the list.


   H. Peter Anvin <> and Ian Kent <>.

                              12 Apr 2006                     AUTOMOUNT(8)


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