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.\" Linux man page by B. James Phillippe, 1997 <bryan@Terran.ORG>
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.\"
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.\" This page was written to contribute to the Linux kernel autofs
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.\" implementation by H. Peter Anvin (1997). It is loosly based on
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.\" the documentation for mount(8) and amd(8) Linux manpages.
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.\"
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.\" This is free documentation.
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.\"
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.TH AUTOMOUNT 8 "12 Apr 2006"
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.SH NAME
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automount \- manage autofs mount points
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.SH SYNOPSIS
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\fBautomount\fP [\fIoptions\fP] [\fImaster_map\fP]
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.SH DESCRIPTION
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The \fBautomount\fP program is used to manage mount points for
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autofs, the inlined Linux automounter. \fBautomount\fP works by
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reading the
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.nh
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.BR auto.master (5)
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.hy
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map and sets up mount points for each entry in the master map allowing
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them to be automatically mounted when accessed. The file systems are
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then automatically umounted after a period of inactivity.
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.SH OPTIONS
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.TP
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.I "\-h, \-\-help"
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Print brief help on program usage.
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.TP
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.I "\-p, \-\-pid-file"
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Write the pid of the daemon to the specified file.
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.TP
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.I "\-t <seconds>, \-\-timeout <seconds>"
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Set the global minimum timeout, in seconds, until directories
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are unmounted. The default is 10 minutes. Setting the timeout
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to zero disables umounts completely.
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The internal program default is 10 minutes, but the default
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installed configuration overrides this and sets the timeout
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to 5 minutes to be consistent with earlier autofs releases.
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.TP
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.I "\-M <seconds>, \-\-master-wait <seconds>"
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Set the maximum time to wait for the master map to become available
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if it cannot be read at program start.
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.TP
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.I "\-n <seconds>, \-\-negative\-timeout <seconds>"
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Set the default timeout for caching failed key lookups. The default is 60 seconds.
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.TP
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.I "\-v, \-\-verbose"
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Enables logging of general status and progress messages for all
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autofs managed mounts.
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.TP
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.I "\-d, \-\-debug"
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Enables logging of general status and progress messages as well as
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debugging messages for all autofs managed mounts.
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.TP
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.I "\-Dvariable=value, --define variable=value"
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Define a global macro substitution variable. Global definitions
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are over-ridden macro definitions of the same name specified in
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mount entries.
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.TP
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.I \-S, \-\-systemd-service
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Used when running the automounter as a systemd service to ensure log entry
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format is consistent with the log entry format when running as a daemon.
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.TP
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.I "\-f, \-\-foreground"
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Run the daemon in the foreground and log to stderr instead of syslog."
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.TP
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.I "\-r, \-\-random-multimount-selection"
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Enables the use of random selection when choosing a host from a
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list of replicated servers.
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.TP
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.I "\-m, \-\-dumpmaps [<map type> <map name>]"
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With no parameters, list information about the configured automounter
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maps, then exit.
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If the dumpmaps option is given and is followed by two parameters,
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"<map type> <map name>" then simple "<key, value>" pairs that would
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be read in by a map read are printed to stdout if the given map type
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and map name are found in the map configuration.
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If the map is an LDAP map and there is more than one map of same name
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in different base dns only the first map encountered by autofs will
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be listed. Similarly, if the map is a file map and there is more than
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one map of the same name in different directories, only the first map
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encountered will be listed.
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If the map type is an old style multi-map and any one of the map
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names in the multi-map entry matches the given map name the entries
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that would be used by autofs for the whole multi-map will be listed.
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.TP
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.I "\-O, \-\-global-options"
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Allows the specification of global mount options used for all master
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map entries. These options will either replace or be appened to options
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given in a master map entry depending on the APPEND_OPTIONS configuration
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setting.
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.TP
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.I "\-V, \-\-version"
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Display the version number, then exit.
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.TP
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.I "\-l, \-\-set-log-priority priority path [path,...]"
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Set the daemon log priority to the specified value. Valid values include
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the numbers 0-7, or the strings emerg, alert, crit, err, warning, notice,
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info, or debug. Log level debug will log everything, log levels info, warn
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(or warning), or notice with enable the daemon verbose logging. Any other
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level will set basic logging. Note that enabling debug or verbose
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logging in the autofs global configuration will override dynamic log level
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changes. For example, if verbose logging is set in the configuration then
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attempting to set logging to basic logging, by using alert, crit, err
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or emerg won't stop the verbose logging. However, setting logging to debug
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will lead to everything (debug logging) being logged witch can then also
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be disabled, returning the daemon to verbose logging. This option can be
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specified to change the logging priority of an already running automount
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process.
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.P
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The \fIpath\fP argument corresponds to the automounted
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path name as specified in the master map.
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.TP
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.I "\-C, \-\-dont-check-daemon"
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Don't check if the daemon is currently running (see NOTES).
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.TP
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.I "\-F, \-\-force"
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Force an unlink umount of existing mounts under autofs managed mount points
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during startup. This can cause problems for processes with working directories
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within these mounts (see NOTES).
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.SH ARGUMENTS
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\fBautomount\fP takes one optional argument, the name of the master map to
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use.
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.TP
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\fBmaster_map\fP
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Location for autofs master map that defines autofs managed mount points
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and the mount maps they will use. The default is
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.nh
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\fBauto.master\fP.
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.hy
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.RE
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.SH NOTES
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If the \fBautomount\fP daemon catches a USR1 signal, it will umount all
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currently unused autofs managed mounted file systems and continue running
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(forced expire). If it catches the TERM signal it will umount
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all unused autofs managed mounted file systems and exit if there are
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no remaining busy file systems. If autofs has been compiled with the
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option to ignore busy mounts on exit it will exit leaving any busy
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mounts in place otherwise busy file systems will not be umounted
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and autofs will not exit.
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Alternatively, if autofs has been compiled with the option to enable
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forced shutdown then a USR2 signal to the daemon will cause all
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mounts to be umounted and any busy mounts to be forcibly umounted,
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including autofs mount point directories (summary execution). Note
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that the forced umount is an unlink operation and the actual umount
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will not happen in the kernel until active file handles are released.
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The daemon also responds to a HUP signal which triggers an update of
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the maps for each mount point.
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.P
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If any autofs mount point directories are busy when the daemon is sent
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an exit signal the daemon will not exit. The exception to this is
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if autofs has been built with configure options to either ignore busy
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mounts at exit or force umount at exit. If the ignore busy mounts at
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exit option is used the filesystems will be left in a catatonic
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(non-functional) state and can be manually umounted when they become
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unused. If the force umount at exit option is used the filesystems
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will be umounted but the mount will not be released by the kernel
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until they are no longer in use by the processes that held them busy.
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If automount managed filesystems are found mounted when autofs is
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started they will be recovered unless they are no longer present in
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the map in which case they need to umounted manually.
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.P
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If the option to disable the check to see if the daemon is already
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running is used be aware that autofs currently may not function correctly
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for certain types of automount maps. The mounts of the separate daemons
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might interfere with one another. The implications of running multiple
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daemon instances needs to be checked and tested before we can say this
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is supported.
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.P
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If the option to force an unlink of mounts at startup is used then processes
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whose working directory is within unlinked automounted directories will not
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get the correct pwd from the system. This is because, after the mount is
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unlinked from the mount tree, anything that needs to walk back up the mount
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tree to construct a path, such as getcwd(2) and the proc filesystem
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/proc/<pid>/cwd, cannot work because the point from which the path is
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constructed has been detached from the mount tree.
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.SH "SEE ALSO"
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.BR autofs (5),
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.BR autofs (8),
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.BR autofs.conf (5),
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.BR auto.master (5),
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.BR mount (8),
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.BR autofs_ldap_auth.conf (5).
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.SH BUGS
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Don't know, I've fixed everything I know about.
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The documentation could be better.
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Please report other bugs along with a detailed description to
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<autofs@vger.kernel.org>. Visit http://vger.kernel.org/vger-lists.html#autofs
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for information about the list.
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.SH AUTHOR
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H. Peter Anvin <hpa@transmeta.com> and Ian Kent <raven@themaw.net>.
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