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
Print brief help on program usage.
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.
Enables logging of general status and progress messages for
all autofs managed mounts.
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.
Run the daemon in the foreground and log to stderr instead of
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.
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.
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.
Don't check if the daemon is currently running (see NOTES).
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
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.
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
http://vger.kernel.org/vger-lists.html#autofs for information about
This page is part of the autofs (automount) project. Information
about the project can be found at ⟨http://www.autofs.org/⟩. If you
have a bug report for this manual page, send it to
email@example.com. This page was obtained from the project's
upstream Git repository
2016-08-07. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to firstname.lastname@example.org
12 Apr 2006 AUTOMOUNT(8)