Provided by: autofs5_5.0.6-0ubuntu5_amd64 bug


       autofs - Format of the automounter maps


       The  automounter maps are FILE, NIS, NISPLUS or LDAP maps referred to by the master map of
       the automounter (see auto.master(5)).  These maps describe  how  file  systems  below  the
       mount  point  of the map (given in the master map) are to be mounted.  This page describes
       the sun map format; if another map format is specified (e.g. hesiod),  this  documentation
       does not apply.

       Indirect maps can be changed on the fly and the automouter will recognize those changes on
       the next operation it performs on that map. Direct maps require a HUP signal  be  sent  to
       the daemon to refresh their contents as does the master map.


       This  is  a  description of the text file format.  Other methods of specifying these files
       may exist.  All empty lines or lines beginning with # are ignored. The basic format of one
       line in such maps is:

       key [-options] location

       For indirect mounts this is the part of the path name between the mount point and the path
       into the filesystem when it is mounted. Usually you can think about  the  key  as  a  sub-
       directory name below the autofs managed mount point.

       For direct mounts this is the full path of each mount point. This map is always associated
       with the /- mount point in the master map.

       Zero or more options may be given.  Options can also be given in the auto.master  file  in
       which  case both values are cumulative (this is a difference from SunOS).  The options are
       a list of comma separated options as customary for the mount(8)  command.  There  are  two
       special options -fstype= used to specify a filesystem type if the filesystem is not of the
       default NFS type.  This option is processed by  the  automounter  and  not  by  the  mount
       command.   -strict  is  used  to treat errors when mounting file systems as fatal. This is
       important when multiple file systems should be mounted (`multi-mounts'). If this option is
       given,  no  file  system  is  mounted at all if at least one file system can't be mounted.
       -use-weight-only is used to make the weight the sole factor in  selecting  a  server  when
       multiple  servers  are  present  in  a  map entry.  and -no-use-weight-only can be used to
       negate the option if it is present in the master map entry for the map but is  not  wanted
       for the given mount.

       The  location  specifies  from  where the file system is to be mounted.  In the most cases
       this will be an NFS volume and the usual notation host:pathname is used  to  indicate  the
       remote filesystem and path to be mounted.  If the filesystem to be mounted begins with a /
       (such as local /dev entries or smbfs shares) a : needs to be prefixed (e.g.  :/dev/sda1).


       Indirect map:

         kernel    -ro,soft,intr
         boot      -fstype=ext2        :/dev/hda1
         windoze   -fstype=smbfs       ://windoze/c
         removable -fstype=ext2        :/dev/hdd
         cd        -fstype=iso9660,ro  :/dev/hdc
         floppy    -fstype=auto        :/dev/fd0
         server    -rw,hard,intr       / -ro \
                                       /usr \

       In the first line we have a NFS remote mount of the kernel  directory  on
       This  is mounted read-only.  The second line mounts an ext2 volume from a local ide drive.
       The third makes a share exported from a Windows machine available for  automounting.   The
       rest  should  be  fairly  self-explanatory.  The  last  entry (the last three lines) is an
       example of a multi-map (see below).

       If you use the automounter for a filesystem without access permissions (like vfat),  users
       usually  can't  write  on  such  a filesystem because it is mounted as user root.  You can
       solve this problem by passing the option gid=<gid>, e.g.  gid=floppy.  The  filesystem  is
       then  mounted  as  group floppy instead of root. Then you can add the users to this group,
       and they can write to the filesystem. Here's an example entry for an autofs map:

         floppy-vfat  -fstype=vfat,sync,gid=floppy,umask=002  :/dev/fd0

       Direct map:

         /nfs/apps/mozilla             bogus:/usr/local/moxill
         /nfs/data/budgets             tiger:/usr/local/budgets
         /tst/sbin                     bogus:/usr/sbin


   Map Key Substitution
       An & character in the location is expanded to the value of the key field that matched  the
       line (which probably only makes sense together with a wildcard key).

   Wildcard Key
       A  map  key  of  * denotes a wild-card entry. This entry is consulted if the specified key
       does not exist in the map.  A typical wild-card entry looks like this:

         *         server:/export/home/&

       The special character '&' will be replaced by the provided key.  So, in the example above,
       a lookup for the key 'foo' would yield a mount of server:/export/home/foo.

   Variable Substitution
       The  following  special variables will be substituted in the key and location fields of an
       automounter map if prefixed with $ as customary from shell scripts (Curly  braces  can  be
       used to separate the field name):

         ARCH           Architecture (uname -m)
         CPU            Processor Type
         HOST           Hostname (uname -n)
         OSNAME         Operating System (uname -s)
         OSREL          Release of OS (uname -r)
         OSVERS         Version of OS (uname -v)

       autofs provides additional variables that are set based on the user requesting the mount:

         USER           The user login name
         UID            The user login ID
         GROUP          The user group name
         GID            The user group ID
         HOME           The user home directory
         HOST           Hostname (uname -n)

       Additional entries can be defined with the -Dvariable=Value map-option to automount(8).

   Executable Maps
       A  map  can  be  marked  as  executable.  A  program map will be called with the key as an
       argument.  It may return no lines of output if there's an error,  or  one  or  more  lines
       containing  a  map  entry  (with \ quoting line breaks). The map entry corresponds to what
       would normally follow a map key.

       An executable map can return an error code to indicate  the  failure  in  addition  to  no
       output at all.  All output sent to stderr is logged into the system logs.

   Multiple Mounts
       A multi-mount map can be used to name multiple filesystems to mount.  It takes the form:

         key [-options] [mount-point [-options] location...]...

       This  may  extend  over multiple lines, quoting the line-breaks with `\ยด.  If present, the
       per-mountpoint mount-options are appended to the default mount-options.

   Replicated Server
         Multiple replicated hosts, same path:
         <path> host1,host2,hostn:/path/path

         Multiple hosts, some with same path, some with another
         <path> host1,host2:/blah host3:/some/other/path

         Multiple replicated hosts, different (potentially) paths:
         <path> host1:/path/pathA host2:/path/pathB

         Mutliple weighted, replicated hosts same path:
         <path> host1(5),host2(6),host3(1):/path/path

         Multiple weighted, replicated hosts different (potentially) paths:
         <path> host1(3):/path/pathA host2(5):/path/pathB

         Anything else is questionable and unsupported, but these variations will also work:
         <path> host1(3),host:/blah


       This version of the automounter supports direct maps stored in FILE, NIS, NISPLUS and LDAP


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


       This  manual  page  was  written  by  Christoph Lameter <>, for the Debian
       GNU/Linux system.  Edited by  H.  Peter  Avian  <>,  Jeremy  Fitzhardinge
       <> and Ian Kent <>.

                                           14 Jan 2000                                  AUTOFS(5)