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amq - automounter query tool
amq [ -fimpqsvwHTU ] [ -h hostname ] [ -l log_file ] [ -x log_options ]
[ -D debug_options ] [ -P program_number ] [[ -u ] directory ... ]
Amq provides a simple way of determining the current state of amd pro-
gram. Communication is by RPC. Three modes of operation are supported
by the current protocol. By default a list of mount points and auto-
mounted filesystems is output. An alternative host can be specified
using the -h option.
If directory names are given, as output by default, then per-filesystem
information is displayed.
-f Ask the automounter to flush the internal caches and reload all
Specify an alternate host to query. By default the local host
is used. In an HP-UX cluster, the root server is queried by
default, since that is the system on which the automounter is
-i Print information about the mount maps.
Tell amd to use log_file as the log file name. For security
reasons, this must be the same log file which amd used when
started. This option is therefore only useful to refresh amd's
open file handle on the log file, so that it can be rotated and
compressed via daily cron jobs.
-m Ask the automounter to provide a list of mounted filesystems,
including the number of references to each filesystem and any
error which occurred while mounting.
-p Return the process ID of the remote or locally running amd.
Useful when you need to send a signal to the local amd process,
and would rather not have to search through the process table.
This option is used in the ctl-amd script.
-q Suppress error messages produced when attempting synchronous
unmounts with the -u option.
-s Ask the automounter to provide system-wide mount statistics.
-u Ask the automounter to unmount the filesystems named in direc-
tory instead of providing information about them. Unmounts are
requested, not forced. They merely cause the mounted filesystem
to timeout, which will be picked up by amd's main scheduler thus
causing the normal timeout action to be taken. If the -u option
is repeated, amq will attempt to unmount the file system syn-
chronously by waiting until the timeout action is taken and
returning an error if the unmount fails. Any error messages
produced may be suppressed with the -q option.
-v Ask the automounter for its version information. This is a sub-
set of the information output by amd's -v option.
-w Translate a full pathname as returned by getcwd(3) into a short
Amd pathname that goes through its mount points. This option
requires that Amd is running.
Ask the automounter to use the logging options specified in
log_options from now on. Note that the "fatal" and "error"
options cannot be turned off.
Ask the automounter to use the debugging options specified in
debug_options from now on.
-H Display short usage message.
Contact an alternate running amd that had registered itself on a
different RPC program_number and apply all other operations to
that instance of the automounter. This is useful when you run
multiple copies of amd, and need to manage each one separately.
If not specified, amq will use the default program number for
amd, 300019. For security reasons, the only alternate program
numbers amd can use range from 300019 to 300029, inclusive.
-T Contact amd using the TCP transport only. Normally amq will try
TCP, and if that failed, will try UDP.
-U Contact amd using UDP (connectionless) transport only. Normally
amq will try TCP, and if that failed, will try UDP.
amq.x RPC protocol description.
Amq uses a Sun registered RPC program number (300019 decimal) which may
not be in the /etc/rpc database.
If the TCP wrappers library is available, and the use_tcpwrappers
global amd.conf option is set to ``yes'', then amd will verify that the
host running amq is authorized to connect. The amd service name must
used in the /etc/hosts.allow and /etc/hosts.deny files. For example,
to allow only localhost to connect to amd, add this line to
and this line to /etc/hosts.deny:
amd(8), amd.conf(5), hosts_access(5).
``am-utils'' info(1) entry.
Linux NFS and Automounter Administration by Erez Zadok, ISBN
0-7821-2739-8, (Sybex, 2001).
Amd - The 4.4 BSD Automounter
Jan-Simon Pendry <firstname.lastname@example.org>, Department of Computing, Imperial
College, London, UK.
Erez Zadok <email@example.com>, Computer Science Department, Stony
Brook University, Stony Brook, New York, USA.
Other authors and contributors to am-utils are listed in the AUTHORS
file distributed with am-utils.
15 September 2011 AMQ(8)