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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 mas-
ter map allowing them to be automatically mounted when accessed. The
file systems are then automatically umounted after a period of inactiv-
Print brief help on program usage.
Write the pid of the daemon to the specified file.
Set the global minimum timeout, in seconds, until directories
are unmounted. The default is 10 minutes. Setting the timeout to
zero disables umounts completely.
-n <seconds>, --negative-timeout <seconds>
Set the default timeout for caching failed key lookups. The de-
fault 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 debuging messages for all autofs managed mounts.
Define a global macro substitution variable. Global definitions
are over-ridden macro definitions of the same name specified in
Run the daemon in the forground and log to stderr instead of
Enables the use of ramdom selection when choosing a host from a
list of replicated servers.
Dump configured automounter maps, then exit.
sic 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 configu-
ration then attempting to set logging to basic logging, by using
alert, crit, err or emerg won't stop the verbose logging. Howev-
er, setting logging to debug will lead to everything (debug log-
ging) 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 pro-
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 pro-
cesses with working directories within these mounts (see NOTES).
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 cur-
rently unused autofs managed mounted file systems and continue running
(forced expire). If it catches the TERM signal it will umount all un-
used autofs managed mounted file systems and exit if there are no re-
maining 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 dae-
mon 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
If the option to force an unlink of mounts at startup is used then pro-
cesses whose working directory is within unlinked automounted directo-
ries will not get the correct pwd from the system. This is because, af-
ter 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), auto.master(5), mount(8). aut-
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 <aut-
firstname.lastname@example.org>. For instructions on how to join the list and for
archives visit http://linux.kernel.org/mailman/listinfo/autofs
H. Peter Anvin <email@example.com> and Ian Kent <firstname.lastname@example.org>.
12 Apr 2006 AUTOMOUNT(8)