AMD.CONF(8) AMD.CONF(8)
7 August 1997
NAME
amd.conf - amd configuration file
SYNOPSIS
amd.conf
DESCRIPTION
The amd.conf file is the configuration file for amd, as part of the
am-utils suite.
amd.conf contains runtime configuration information for the amd
automounter program.
FILE FORMAT
The file consists of sections and parameters. A section begins with
the name of the section in square brackets and continues until the
next section begins or the end the file is reached. Sections contain
parameters of the form 'name = value'.
The file is line-based - that is, each newline-terminated line
represents either a comment, a section name or a parameter. No line-
continuation syntax is available.
Section, parameter names and their values are case sensitive.
Only the first equals sign in a parameter is significant. Whitespace
before or after the first equals sign is discarded. Leading, trailing
and internal whitespace in section and parameter names is irrelevant.
Leading and trailing whitespace in a parameter value is discarded.
Internal whitespace within a parameter value is not allowed, unless
the whole parameter value is quoted with double quotes as in 'name =
"some value"'.
Any line beginning with a pound sign (#) is ignored, as are lines
containing only whitespace.
The values following the equals sign in parameters are all either a
string (no quotes needed if string does not include spaces) or a
boolean, which may be given as yes/no. Case is significant in all
values. Some items such as cache timeouts are numeric.
SECTIONS
The [global] section
Parameters in this section either apply to amd as a whole, or to all
other regular map sections which follow. There should be only one
global section defined in one configuration file.
It is highly recommended that this section be specified first in the
configuration file. If it is not, then regular map sections which
precede it will not use global values defined later.
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Regular [/map] sections
Parameters in regular (non-global) sections apply to a single map
entry. For example, if the map section [/homes] is defined, then all
parameters following it will be applied to the /homes amd-managed
mount point.
PARAMETERS
Parameters common to all sections
These parameters can be specified either in the global or a map
specific section. Entries specified in a map-specific section
override the default value or one defined in the global section. If
such a common parameter is specified only in the global section, it is
applicable to all regular map sections that follow.
browsable_dirs (string, default=no)
If "yes", then amd's top-level mount points will be browsable to
readdir(3) calls. This means you could run for example ls(3) and
see what keys are available to mount in that directory. Not all
entries are made visible to readdir(3): the "/default" entry,
wildcard entries, and those with a "/" in them are not included.
If you specify "full" to this option, all but "/default" will be
visible. Note that if you run a command which will attempt to
stat(2) the entries, such as often done by "ls -l" or "ls -F",
amd will attempt to mount every entry in that map. This is often
called a ``mount storm''.
map_options (string, default no options)
This option is the same as specifying map options on the command
line to amd, such as "cache:=all".
map_type (string, default search all map types)
If specified, amd will initialize the map only for the type
given. This is useful to avoid the default map search type used
by amd which takes longer and can have undesired side-effects
such as initializing NIS even if not used. Possible values are
file plain files
hesiod Hesiod name service from MIT
ldap Lightweight Directory Access Protocol
ndbm (New) dbm style hash files
nis Network Information Services (version 2)
nisplus Network Information Services Plus (version 3)
passwd local password files
union union maps
mount_type (string, default=nfs)
All amd mount types default to NFS. That is, amd is an NFS
server on the map mount points, for the local host it is running
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on. If "autofs" is specified, amd will be an autofs server for
those mount points.
search_path (string, default no search path)
This provides a (colon-delimited) search path for file maps.
Using a search path, sites can allow for local map customizations
and overrides, and can distributed maps in several locations as
needed.
Parameters applicable to the global section
arch (string, default to compiled in value)
Allows you to override the value of the arch amd variable.
auto_dir (string, default=/a)
Same as the -a option to amd. This sets the private directory
where amd will create sub-directories for its real mount points.
cache_duration (numeric, default=300)
Same as the -c option to amd. Sets the duration in seconds that
looked up map entries remain in the cache.
cluster (string, default no cluster)
Same as the -C option to amd. Specifies the alternate HP-UX
cluster to use.
debug_options (string, default no debug options)
Same as the -D option to amd. Specify any debugging options for
amd. Works only if am-utils was configured for debugging using
the --enable-debug option. The "mem" option, as well as all
other options, can be turned on via --enable-debug=mem.
Otherwise debugging options are ignored. Options are comma
delimited, and can be preceded by the string "no" to negate their
meaning. You can get the list of supported debugging options by
running amd -H. Possible values are:
all all options
amq register for amq
daemon enter daemon mode
fork fork server
full program trace
hrtime print high resolution time stamps (only if syslog(3) is not used)
info info service specific debugging (hesiod, nis, etc.)
mem trace memory allocations
mtab use local "./mtab" file
readdir show browsable_dirs progress
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str debug string munging
test full debug but no daemon
trace trace protocol and NFS mount arguments
xdrtrace trace XDR routines
dismount_interval (numeric, default=120)
Same as the -w option to amd. Specify in seconds, the time
between attempts to dismount file systems that have exceeded
their cached times.
full_os (string, default to compiled in value)
The full name of the operating system, along with its version.
Allows you to override the compiled-in full name and version of
the operating system. Useful when the compiled-in name is not
desired. For example, the full operating system name on linux
comes up as ``linux'', but you can override it to ``linux-
2.2.5.''
fully_qualified_hosts (string, default=no)
If "yes", Amd will perform RPC authentication using fully-
qualified host names. This is necessary for some systems, and
especially when performing cross-domain mounting. For this
function to work, the Amd variable ${hostd} is used, requiring
that ${domain} not be null.
hesiod_base (string, default=automount)
Specify the base name for hesiod maps.
karch (string, default to karch of the system)
Same as the -k option to amd. Allows you to override the
kernel-architecture of your system. Useful for example on Sun
(Sparc) machines, where you can build one amd binary, and run it
on multiple machines, yet you want each one to get the correct
karch variable set (for example, sun4c, sun4m, sun4u, etc.) Note
that if not specified, amd will use uname(2) to figure out the
kernel architecture of the machine.
ldap_base (string, default not set)
Specify the base name for LDAP. This often includes LDAP-
specific values such as country and organization.
ldap_cache_maxmem (numeric, default=131072)
Specify the maximum memory amd should use to cache LDAP entries.
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ldap_cache_seconds (numeric, default=0)
Specify the number of seconds to keep entries in the cache.
ldap_hostports (string, default not set)
Specify the LDAP host and port values.
local_domain (string, default no sub-domain)
Same as the -d option to amd. Specify the local domain name. If
this option is not given the domain name is determined from the
hostname, by removing the first component of the fully-qualified
host name.
log_file (string, default=/dev/stderr)
Same as the -l option to amd. Specify a file name to log amd
events to. If the string /dev/stderr is specified, amd will send
its events to the standard error file descriptor. If the string
syslog is given, amd will record its events with the system
logger syslogd(8). The default syslog facility used is
LOG_DAEMON. If you wish to change it, append its name to the log
file name, delimited by a single colon. For example, if logfile
is the string syslog:local7 then amd will log messages via
syslog(3) using the LOG_LOCAL7 facility (if it exists on the
system).
log_options (string, default no logging options)
Same as the -x option to amd. Specify any logging options for
amd. Options are comma delimited, and can be preceded by the
string "no" to negate their meaning. The "debug" logging option
is only available if am-utils was configured with --enable-debug.
You can get the list of supported debugging and logging options
by running amd -H. Possible values are:
all all messages
debug debug messages
error non-fatal system errors
fatal fatal errors
info information
map map errors
stats additional statistical information
user non-fatal user errors
warn warnings
warning warnings
nfs_proto (numeric, default to trying version 3 then 2)
By default, amd tries version 3 and then version 2. This option
forces the overall NFS protocol used to version 3 or 2. It
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overrides what is in the amd maps, and is useful when amd is
compiled with NFSv3 support that may not be stable. With this
option you can turn off the complete usage of NFSv3 dynamically
(without having to recompile amd) until such time as NFSv3
support is desired again.
nfs_retransmit_counter (numeric, default=11)
Same as the retransmit part of the -t timeout.retransmit option
to amd. Specifies the number of NFS retransmissions that the
kernel will use to communicate with amd.
nfs_retry_interval (numeric, default=8)
Same as the timeout part of the -t timeout.retransmit option to
amd. Specifies the NFS timeout interval, in tenths of seconds,
between NFS/RPC retries (for UDP only). This is the value that
the kernel will use to communicate with amd.
Amd relies on the kernel RPC retransmit mechanism to trigger
mount retries. The values of the nfs_retransmit_counter and the
nfs_retry_interval parameters change the overall retry interval.
Too long an interval gives poor interactive response; too short
an interval causes excessive retries.
nfs_vers (string, default to trying version tcp then udp)
By default, amd tries TCP and then UDP. This option forces the
overall NFS protocol used to TCP or UDP. It overrides what is in
the amd maps, and is useful when amd is compiled with NFSv3
support that may not be stable. With this option you can turn
off the complete usage of NFSv3 dynamically (without having to
recompile amd) until such time as NFSv3 support is desired again.
nis_domain (string, default to local NIS domain name)
Same as the -y option to amd. Specify an alternative NIS domain
from which to fetch the NIS maps. The default is the system
domain name. This option is ignored if NIS support is not
available.
normalize_hostnames (boolean, default=no)
Same as the -n option to amd. If "yes", then the name refereed
to by ${rhost} is normalized relative to the host database before
being used. The effect is to translate aliases into ``official''
names.
os (string, default to compiled in value)
Same as the -O option to amd. Allows you to override the
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compiled-in name of the operating system. Useful when the
built-in name is not desired for backward compatibility reasons.
For example, if the build in name is ``sunos5'', you can override
it to ``sos5'', and use older maps which were written with the
latter in mind.
osver (string, default to compiled in value)
Same as the -o option to amd. Overrides the compiled-in version
number of the operating system. Useful when the built in version
is not desired for backward compatibility reasons. For example,
if the build in version is ``2.5.1'', you can override it to
``5.5.1'', and use older maps that were written with the latter
in mind.
pid_file (string, default=/dev/stdout)
Specify a file to store the process ID of the running daemon
into. If not specified, amd will print its process id onto the
standard output. Useful for killing amd after it had run. Note
that the PID of a running amd can also be retrieved via amq -p.
This file is used only if the print_pid option is on.
plock (boolean, default=yes)
Same as the -S option to amd. If "yes", lock the running
executable pages of amd into memory. To improve amd's
performance, systems that support the plock(3) call can lock the
amd process into memory. This way there is less chance it the
operating system will schedule, page out, and swap the amd
process as needed. This improves amd's performance, at the cost
of reserving the memory used by the amd process (making it
unavailable for other processes).
portmap_program (numeric, default=300019)
Specify an alternate Port-mapper RPC program number, other than
the official number. This is useful when running multiple amd
processes. For example, you can run another amd in "test" mode,
without affecting the primary amd process in any way. For safety
reasons, the alternate program numbers that can be specified must
be in the range 300019-300029, inclusive. amq has an option -P
which can be used to specify an alternate program number of an
amd to contact. In this way, amq can fully control any number of
amd processes running on the same host.
print_pid (boolean, default=no)
Same as the -p option to amd. If "yes", amd will print its
process ID upon starting.
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print_version (boolean, default=no)
Same as the -v option to amd, but the version prints and amd
continues to run. If "yes", amd will print its version
information string, which includes some configuration and
compilation values.
restart_mounts (boolean, default=no)
Same as the -r option to amd. If "yes" amd will scan the mount
table to determine which file systems are currently mounted.
Whenever one of these would have been auto-mounted, amd inherits
it.
selectors_in_defaults (boolean, default=no)
If "yes", then the /defaults entry of maps will search for and
process any selectors before setting defaults for all other keys
in that map. Useful when you want to set different options for a
complete map based on some parameters. For example, you may want
to better the NFS performance over slow slip-based networks as
follows:
/defaults \
wire==slip-net;opts:=intr,rsize=1024,wsize=1024 \
wire!=slip-net;opts:=intr,rsize=8192,wsize=8192
Deprecated form: selectors_on_default
show_statfs_entries (boolean), default=no)
If "yes", then all maps which are browsable will also show the
number of entries (keys) they have when "df" runs. (This is
accomplished by returning non-zero values to the statfs(2) system
call).
unmount_on_exit (boolean), default=no)
If "yes", then amd will attempt to unmount all file systems which
it knows about. Normally amd leaves all (esp. NFS) mounted file
systems intact. Note that amd does not know about file systems
mounted before it starts up, unless the restart_mounts option or
-r flag are used.
vendor (string, default to compiled in value)
The name of the vendor of the operating system. Overrides the
compiled-in vendor name. Useful when the compiled-in name is not
desired. For example, most Intel based systems set the vendor
name to ``unknown'', but you can set it to ``redhat.''
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Parameters applicable to regular map sections
map_name (string, must be specified)
Name of the map where the keys are located.
tag (string, default no tag)
Each map entry in the configuration file can be tagged. If no
tag is specified, that map section will always be processed by
amd. If it is specified, then amd will process the map if the -T
option was given to amd, and the value given to that command-line
option matches that in the map section.
EXAMPLES
Here is a real amd configuration file I use daily.
# GLOBAL OPTIONS SECTION
[ global ]
normalize_hostnames = no
print_pid = no
restart_mounts = yes
auto_dir = /n
log_file = /var/log/amd
log_options = all
#debug_options = all
plock = no
selectors_in_defaults = yes
# config.guess picks up "sunos5" and I don't want to edit my maps yet
os = sos5
# if you print_version after setting up "os", it will show it.
print_version = no
map_type = file
search_path = /etc/amdmaps:/usr/lib/amd:/usr/local/AMD/lib
browsable_dirs = yes
# DEFINE AN AMD MOUNT POINT
[ /u ]
map_name = amd.u
[ /proj ]
map_name = amd.proj
[ /src ]
map_name = amd.src
[ /misc ]
map_name = amd.misc
[ /import ]
map_name = amd.import
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[ /tftpboot/.amd ]
tag = tftpboot
map_name = amd.tftpboot
SEE ALSO
amd(8), amq(8), ctl-amd(8).
AUTHORS
Erez Zadok <ezk@cs.columbia.edu>, Department of Computer Science,
Columbia University, New York, USA.
Other authors and contributors to am-utils are listed in the AUTHORS
file distributed with am-utils.
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