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-.\"
-.\" $FreeBSD$
-.\"
-.Dd January 12, 2000
-.Dt NTP_MON 8
-.Os
-.Sh NAME
-.Nm ntp_mon
-.Nd NTP daemon monitoring options
-.Sh SYNOPSIS
-.Pa /etc/ntp.conf
-.Sh DESCRIPTION
-Xr ntpd 8
-includes a comprehensive monitoring facility
-suitable for continuous, long term recording
-of server and client timekeeping performance.
-See the
-.Ic statistics
-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
-.Pa ./scripts
-directory of the source distribution.
-Using these facilities and Unix
-.Xr cron 8
-jobs,
-the data can be automatically summarized and archived
-for retrospective analysis.
-.Ss Monitoring Commands
-The following monitoring commands are available:
-.Bl -tag -width indent
-.It Xo Ic statistics
-.Ar name
-.Op ...
-.Xc
-Enables writing of statistics records.
-Currently, four kinds of
-.Ar name
-statistics are supported.
-.Bl -tag -width indent
-.It loopstats
-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 loopstats:
-.Pp
-.Dl 50935 75440.031 0.000006019 13.778190 0.000351733 0.013380 6
-.Pp
-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.
-.It peerstats
-Enables recording of peer statistics information.
-This includes statistics records of all peers of a NTP server
-and of special signals, where present and configured.
-Each valid update appends a line of the following form to
-the current element of a file generation set named peerstats:
-.Pp
-.Dl 48773 10847.650 127.127.4.1 9714 -0.001605 0.00000 0.00142
-.Pp
-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.
-.It clockstats
-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 clockstats:
-.Pp
-.Dl 49213 525.624 127.127.4.1 93 226 00:08:29.606 D
-.Pp
-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.
-.It rawstats
-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 rawstats:
-.Pp
-.Bd -ragged -offset indent
-.Li 50928
-.Li 2132.543
-.Li 128.4.1.1
-.\"
-.\" XXX The next field is unaccounted for in the descriptive text
-.\"	that follows.
-.\"
-.Li 128.4.1.20
-.Li 3102453281.584327000
-.Li 3102453281.58622800031
-.Li 02453332.540806000
-.Li 3102453332.541458000
-.Ed
-.Pp
-The first two fields show the date (Modified Julian Day)
-and time (seconds and fraction past UTC midnight).
-The next field shows the peer or clock 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.
-.El
-.It Ic statsdir Ar directory_path
-Indicates the full path of a directory
-where statistics files should be created (see below).
-This keyword allows the
-(otherwise constant) filegen filename prefix to be modified
-for file generation sets,
-which is useful for handling statistics logs.
-.It Xo Ic filegen
-.Ar name
-.Op file Ar filename
-.Op type Ar typename
-.Op link | nolink
-.Op enable | disable
-.Xc
-Configures setting of generation file set name.
-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 administrative operations
-without the risk of disturbing the operation of
-.Xr ntpd 8 .
-Most importantly,
-they can be removed to free space for new data produced.
-.Pp
-Note that this command can be sent from the
-.Xr ntpdc 8
-program running at a remote location.
-.Bl -tag -width indent
-.It name
-This is the type of the statistics records,
-as shown in the
-.Ic statistics
-command.
-.It file Ar filename
-This is the file name for the statistics records.
-Filenames of set members are built from three elements:
-.Bl -tag -width indent
-.It prefix
-This is a constant filename path.
-It is not subject to modifications via the
-.Ic filegen
-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 loopstats and peerstats generation
-can be configured using the
-.Ic statsdir
-option explained above.
-.Ar filename
-This string is directly concatenated to the prefix mentioned above
-(no intervening
-.Qq /
-(slash)) .
-This can be modified using the
-.Ar filename
-argument to the
-.Ic filegen
-statement.
-No
-.Qq ..
-elements are allowed in this component
-to prevent filenames referring to parts
-outside the filesystem hierarchy denoted by prefix.
-.Ic suffix
-This part is reflects individual elements of a file set.
-It is generated according to the type of a file set.
-.El
-.It type Ar typename
-A file generation set is characterized by its type.
-The following types are supported:
-.Bl -tag -width indent
-.It none
-The file set is actually a single plain file.
-.It pid
-One element of file set is used per incarnation of a
-.Xr ntpd 8
-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
-.Xr ntpd 8
-server incarnations.
-The set member filename is built by appending a
-.Qq \&.
-(dot) to concatenated prefix and
-.Ar filename
-strings,
-and appending the decimal representation
-of the process ID of the
-.Xr ntpd 8
-server process.
-.It day
-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
-.Qq \&.
-(dot) and a day specification in the form YYYYMMDD.
-YYYY is a 4-digit year number (e.g. 1992).
-MM is a two digit month number.
-DD is a two digit day number.
-Thus, all information written at 10 December 1992
-would end up in a file named
-.Pa <prefix><filename>.19921210 .
-.It week
-Any file set member contains data
-related to a certain week of a year.
-The term week is defined by computing the day of the year modulo 7.
-Elements of such a file generation set are distinguished
-by appending the following suffix to the file set
-.Ar filename
-base:
-A dot, a 4-digit year number, the letter W,
-and a 2-digit week number.
-For example, information from January, 10th 1992
-would end up in a file with suffix .1992W1.
-.It month
-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.
-.It year
-One generation file element is generated per year.
-The filename suffix consists of a dot and a 4 digit year number.
-.It age
-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 a,
-and an 8-digit number.
-This number is taken to be the number of seconds
-the server has been running
-at the start of the corresponding 24-hour period.
-Information is only written to a file generation
-by specifying enable; output is prevented by specifying disable.
-.It link | nolink
-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 link
-and disabled using nolink.
-If link 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 C,
-and the pid of the
-.Xr ntpd
-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.
-.It enable | disable
-Enables or disables the recording function.
-.El
-.El
-.Sh SEE ALSO
-.Xr ntp_conf 8 ,
-.Xr ntpd 8 ,
-.Xr ntpdc 8 ,
-.Xr ntpq 8
-.Rs
-.%A David L. Mills
-.%T Network Time Protocol (Version 3)
-.%O RFC1305
-.Re
-.Sh HISTORY
-Written by
-.An Dennis Ferguson
-at the University of Toronto.
-Text amended by
-.An David Mills
-at the University of Delaware.