amq - automounter query tool
] [ -h hostname
] [ -l
] [ -x log_options
] [ -D
] [ -P program_number
] [[ -u
provides a simple way of determining the current state of amd
program. 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
names are given, as output by default, then per-filesystem
information is displayed.
- Ask the automounter to flush the internal caches and reload
all the maps.
- -h hostname
- 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
- -l log_file
- 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
- 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.
- 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.
- Suppress error messages produced when attempting
synchronous unmounts with the -u option.
- Ask the automounter to provide system-wide mount
- Ask the automounter to unmount the filesystems named in
directory 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 synchronously
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
- Ask the automounter for its version information. This is a
subset of the information output by amd's -v option.
- 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.
- -x log_options
- 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.
- -D debug_options
- Ask the automounter to use the debugging options specified
in debug_options from now on.
- Display short usage message.
- -P program_number
- 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.
- Contact amd using the TCP transport only. Normally
amq will try TCP, and if that failed, will try UDP.
- Contact amd using UDP (connectionless) transport
only. Normally amq will try TCP, and if that failed, will try UDP.
- RPC protocol description.
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
option is set to ``yes'', then amd
will verify that the
host running amq
is authorized to connect. The amd
must used in the /etc/hosts.allow
example, to allow only localhost to connect to amd,
add this line to
and this line to /etc/hosts.deny:
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
distributed with am-utils.