2000-01-28 14:55:50 +00:00
|
|
|
<html><head><title>
|
|
|
|
|
Monitoring Options
|
|
|
|
|
</title></head><body><h3>
|
|
|
|
|
Monitoring Options
|
2001-08-29 14:35:15 +00:00
|
|
|
</h3>
|
|
|
|
|
|
|
|
|
|
<img align=left src=pic/pogo8.gif><a href=http://www.eecis.udel.edu/~mills/pictures.htm>from <i>Pogo</i>, Walt Kelly</a>
|
|
|
|
|
|
|
|
|
|
<p>The pig watches the logs.
|
|
|
|
|
<br clear=left><hr>
|
2000-01-28 14:55:50 +00:00
|
|
|
|
|
|
|
|
<h4>Monitoring Support</h4>
|
|
|
|
|
|
|
|
|
|
<tt>ntpd</tt> includes a comprehensive monitoring facility suitable for
|
|
|
|
|
continuous, long term recording of server and client timekeeping
|
|
|
|
|
performance. See the <tt>statistics</tt> command below for a listing and
|
|
|
|
|
example of each type of statistics currently supported. Statistic files
|
|
|
|
|
are managed using file generation sets and scripts in the ./scripts
|
|
|
|
|
directory of this distribution. Using these facilities and Unix
|
|
|
|
|
<tt>cron</tt> jobs, the datacan be automatically summarized and archived
|
|
|
|
|
for retrospective analysis.
|
|
|
|
|
|
|
|
|
|
<h4>Monitoring Commands</h4>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dt><tt>statistics <I>name</I> [...]</tt></dt>
|
|
|
|
|
<dd>Enables writing of statistics records. Currently, four kinds of
|
|
|
|
|
<I><tt>name</tt></I>statistics are supported.</dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dt><tt>loopstats</tt></dt>
|
|
|
|
|
<dd>Enables recording of loop filter statistics information. Each update
|
|
|
|
|
of the local clock outputs a line of the following form to the file
|
|
|
|
|
generation set named <tt>loopstats</tt>:</dd>
|
|
|
|
|
|
|
|
|
|
<p><dd><tt>50935 75440.031 0.000006019 13.778190 0.000351733 0.013380
|
|
|
|
|
6</tt></dd>
|
|
|
|
|
|
|
|
|
|
<p><dd>The first two fields show the date (Modified Julian Day) and time
|
|
|
|
|
(seconds and fraction past UTC midnight). The next five fields show time
|
|
|
|
|
offset (seconds), frequency offset (parts per million - PPM), RMS jitter
|
|
|
|
|
(seconds), Allan deviation (PPM) and clock discipline time
|
|
|
|
|
constant.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>peerstats</tt></dt>
|
|
|
|
|
<dd>Enables recording of peer statistics information. This includes
|
1999-12-09 13:01:21 +00:00
|
|
|
statistics records of all peers of a NTP server and of special signals,
|
2000-01-28 14:55:50 +00:00
|
|
|
where present and configured. Each valid update appends a line of the
|
|
|
|
|
following form to the current element of a file generation set named
|
|
|
|
|
<tt>peerstats</tt>:</dd>
|
|
|
|
|
|
|
|
|
|
<p><dd><tt>48773 10847.650 127.127.4.1 9714 -0.001605 0.00000
|
|
|
|
|
0.00142</tt></dd>
|
|
|
|
|
|
|
|
|
|
<p><dd>The first two fields show the date (Modified Julian Day) and time
|
|
|
|
|
(seconds and fraction past UTC midnight). The next two fields show the
|
|
|
|
|
peer address in dotted-quad notation and status, respectively. The
|
|
|
|
|
status field is encoded in hex in the format described in Appendix A of
|
|
|
|
|
the NTP specification RFC 1305. The final three fields show the offset,
|
|
|
|
|
delay and RMS jitter, all in seconds.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>clockstats</tt></dt>
|
|
|
|
|
<dd>Enables recording of clock driver statistics information. Each
|
|
|
|
|
update received from a clock driver appends a line of the following form
|
|
|
|
|
to the file generation set named <tt>clockstats</tt>:</dd>
|
|
|
|
|
|
|
|
|
|
<p><dd><tt>49213 525.624 127.127.4.1 93 226 00:08:29.606 D</tt></dd>
|
|
|
|
|
<p><dd>The first two fields show the date (Modified Julian Day) and time
|
|
|
|
|
(seconds and fraction past UTC midnight). The next field shows the clock
|
|
|
|
|
address in dotted-quad notation, The final field shows the last timecode
|
|
|
|
|
received from the clock in decoded ASCII format, where meaningful. In
|
|
|
|
|
some clock drivers a good deal of additional information can be gathered
|
|
|
|
|
and displayed as well. See information specific to each clock for
|
|
|
|
|
further details.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>rawstats</tt></dt>
|
|
|
|
|
<dd>Enables recording of raw-timestamp statistics information. This
|
|
|
|
|
includes statistics records of all peers of a NTP server and of special
|
|
|
|
|
signals, where present and configured. Each NTP message received from a
|
|
|
|
|
peer or clock driver appends a line of the following form to the file
|
|
|
|
|
generation set named <tt>rawstats</tt>:</dd>
|
|
|
|
|
|
|
|
|
|
<p><dd><tt>50928 2132.543 128.4.1.1 128.4.1.20 3102453281.584327000
|
|
|
|
|
3102453281.58622800031 02453332.540806000 3102453332.541458000</tt></dd>
|
|
|
|
|
|
|
|
|
|
<p><dd>The first two fields show the date (Modified Julian Day) and time
|
|
|
|
|
(seconds and fraction past UTC midnight). The next two fields show the
|
|
|
|
|
remote peer or clock address followed by the local address in
|
|
|
|
|
dotted-quad notation, The final four fields show the originate, receive,
|
|
|
|
|
transmit and final NTP timestamps in order. The timestamp values are as
|
|
|
|
|
received and before processing by the various data smoothing and
|
|
|
|
|
mitigation algorithms.</dd>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<dt><tt>statsdir <I>directory_path</I></tt></dt>
|
|
|
|
|
<dd>Indicates the full path of a directory where statistics files should
|
|
|
|
|
be created (see below). This keyword allows the (otherwise constant)
|
|
|
|
|
<tt>filegen</tt> filename prefix to be modified for file generation
|
|
|
|
|
sets, which is useful for handling statistics logs.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>filegen <I>name</I> [file <I>filename</I>] [type
|
|
|
|
|
<I>typename</I>] [link | nolink] [enable | disable]</tt></dt>
|
|
|
|
|
<dd>Configures setting of generation file set <I>name</I>. Generation
|
|
|
|
|
file sets provide a means for handling files that are continuously
|
|
|
|
|
growing during the lifetime of a server. Server statistics are a typical
|
|
|
|
|
example for such files. Generation file sets provide access to a set of
|
|
|
|
|
files used to store the actual data. At any time at most one element of
|
|
|
|
|
the set is being written to. The type given specifies when and how data
|
|
|
|
|
will be directed to a new element of the set. This way, information
|
|
|
|
|
stored in elements of a file set that are currently unused are available
|
|
|
|
|
for administrational operations without the risk of disturbing the
|
|
|
|
|
operation of <tt>ntpd</tt>. (Most important: they can be removed to free
|
|
|
|
|
space for new data produced.)</dd>
|
|
|
|
|
|
|
|
|
|
<dd>Note that this command can be sent from the <tt>ntpdc</tt> program
|
|
|
|
|
running at a remote location.</dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dt><I><tt>name</tt></I></dt>
|
|
|
|
|
<dd>This is the type of the statistics records, as shown in the
|
2001-08-29 14:35:15 +00:00
|
|
|
<tt>statistics</tt> command.</dd>
|
2000-01-28 14:55:50 +00:00
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<dd><tt>file <I>filename</I></tt></dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dd>This is the file name for the statistics records. Filenames of set
|
|
|
|
|
members are built from three concatenated elements
|
|
|
|
|
<I><tt>prefix</tt></I>, <I><tt>filename</tt></I> and
|
|
|
|
|
<I><tt>suffix</tt></I>:</dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dt><I><tt>prefix</tt></I></dt>
|
|
|
|
|
<dd>This is a constant filename path. It is not subject to modifications
|
|
|
|
|
via the <tt>filegen</tt> option. It is defined by the server, usually
|
|
|
|
|
specified as a compile-time constant. It may, however, be configurable
|
|
|
|
|
for individual file generation sets via other commands. For example, the
|
|
|
|
|
prefix used with <tt>loopstats</tt> and <tt>peerstats</tt> generation
|
|
|
|
|
can be configured using the <tt>statsdir</tt> option explained
|
|
|
|
|
above.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><I><tt>filename</tt></I></dt>
|
|
|
|
|
<dd>This string is directly concatenated to the prefix mentioned above
|
|
|
|
|
(no intervening <tt>/</tt> (slash)). This can be modified using the
|
|
|
|
|
<tt>file</tt> argument to the <tt>filegen</tt> statement. No <tt>..</tt>
|
|
|
|
|
elements are allowed in this component to prevent filenames referring to
|
|
|
|
|
parts outside the filesystem hierarchy denoted by <tt>prefix</tt>.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><I><tt>suffix</tt></I></dt>
|
|
|
|
|
<dd>This part is reflects individual elements of a file set. It is
|
|
|
|
|
generated according to the type of a file set.</dd>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<dd><tt>type <I>typename</I></tt></dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dd>A file generation set is characterized by its type. The following
|
|
|
|
|
types are supported:</dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dt><tt>none</tt></dt>
|
|
|
|
|
<dd>The file set is actually a single plain file.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>pid</tt></dt>
|
|
|
|
|
<dd>One element of file set is used per incarnation of a <tt>ntpd</tt>
|
|
|
|
|
server. This type does not perform any changes to file set members
|
|
|
|
|
during runtime, however it provides an easy way of separating files
|
|
|
|
|
belonging to different <tt>ntpd</tt> server incarnations. The set member
|
|
|
|
|
filename is built by appending a <tt>.</tt> (dot) to concatenated
|
|
|
|
|
<I>prefix</I> and <I>filename</I> strings, and appending the decimal
|
|
|
|
|
representation of the process ID of the <tt>ntpd</tt> server
|
|
|
|
|
process.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>day</tt></dt>
|
|
|
|
|
<dd>One file generation set element is created per day. A day is defined
|
|
|
|
|
as the period between 00:00 and 24:00 UTC. The file set member suffix
|
|
|
|
|
consists of a <tt>.</tt> (dot) and a day specification in the form
|
|
|
|
|
<tt>YYYYMMdd. YYYY</tt> is a 4-digit year number (e.g., 1992).
|
|
|
|
|
<tt>MM</tt> is a two digit month number. <tt>dd</tt> is a two digit day
|
|
|
|
|
number. Thus, all information written at 10 December 1992 would end up
|
|
|
|
|
in a file named <tt><I>prefix filename</I>.19921210</tt>.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>week</tt></dt>
|
|
|
|
|
<dd>Any file set member contains data related to a certain week of a
|
|
|
|
|
year. The term week is defined by computing day-of-year modulo 7.
|
|
|
|
|
Elements of such a file generation set are distinguished by appending
|
|
|
|
|
the following suffix to the file set filename base: A dot, a 4-digit
|
|
|
|
|
year number, the letter <tt>W</tt>, and a 2-digit week number. For
|
|
|
|
|
example, information from January, 10th 1992 would end up in a file with
|
|
|
|
|
suffix <tt>.1992W1</tt>.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>month</tt></dt>
|
|
|
|
|
<dd>One generation file set element is generated per month. The file
|
|
|
|
|
name suffix consists of a dot, a 4-digit year number, and a 2-digit
|
|
|
|
|
month.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>year</tt></dt>
|
|
|
|
|
<dd>One generation file element is generated per year. The filename
|
|
|
|
|
suffix consists of a dot and a 4 digit year number.</dd>
|
|
|
|
|
|
|
|
|
|
<dt><tt>age</tt></dt>
|
|
|
|
|
<dd>This type of file generation sets changes to a new element of the
|
|
|
|
|
file set every 24 hours of server operation. The filename suffix
|
|
|
|
|
consists of a dot, the letter <tt>a</tt>, and an 8-digit number. This
|
|
|
|
|
number is taken to be the number of seconds the server is running at the
|
|
|
|
|
start of the corresponding 24-hour period. Information is only written
|
|
|
|
|
to a file generation by specifying <tt>enable</tt>; output is prevented
|
|
|
|
|
by specifying <tt>disable</tt>.</dd>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<dd><tt>link | nolink</tt></dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dd>It is convenient to be able to access the current element of a file
|
|
|
|
|
generation set by a fixed name. This feature is enabled by specifying
|
|
|
|
|
<tt>link</tt> and disabled using <tt>nolink</tt>. If <tt>link</tt> is
|
|
|
|
|
specified, a hard link from the current file set element to a file
|
|
|
|
|
without suffix is created. When there is already a file with this name
|
|
|
|
|
and the number of links of this file is one, it is renamed appending a
|
|
|
|
|
dot, the letter <tt>C</tt>, and the pid of the <tt>ntpd</tt> server
|
|
|
|
|
process. When the number of links is greater than one, the file is
|
|
|
|
|
unlinked. This allows the current file to be accessed by a constant
|
|
|
|
|
name.</dd>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<dd><tt>enable | disable</tt></dd>
|
|
|
|
|
|
|
|
|
|
<dl>
|
|
|
|
|
|
|
|
|
|
<dd>Enables or disables the recording function.</dd>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
<hr><a href=index.htm><img align=left src=pic/home.gif></a><address><a
|
|
|
|
|
href=mailto:mills@udel.edu> David L. Mills <mills@udel.edu></a>
|
|
|
|
|
</address></a></body></html>
|
