Map Types

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Map Types
=========

   A mount-map provides the run-time configuration information to Amd.
Maps can be implemented in many ways.  Some of the forms supported by
Amd are regular files, ndbm databases, NIS maps the "Hesiod" name
server and even the password file.

   A mount-map "name" is a sequence of characters.  When an automount
point is created a handle on the mount-map is obtained.  For each map
type configured Amd attempts to reference the a map of the appropriate
type.  If a map is found, Amd notes the type for future use and deletes
the reference, for example closing any open file descriptors.  The
available maps are configure when Amd is built and can be displayed by
running the command `amd -v'.

   By default, Amd caches data in a mode dependent on the type of map.
This is the same as specifying `cache:=mapdefault' and selects a
suitable default cache mode depending on the map type.  The individual
defaults are described below.  The CACHE option can be specified on
automount points to alter the caching behaviour (*note Automount
Filesystem::.).

   The following map types have been implemented, though some are not
available on all machines.  Run the command `amd -v' to obtain a list
of map types configured on your machine.
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