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from Pogo, Walt Kelly Pig was hired to watch the logs.

Monitoring Commands and Options

Table of Contents

Naming Conventions

The ntpd daemon includes a comprehensive monitoring facility which collects statistical data of various types and writes the data to files associated with each type at defined events or intervals. The files associated with a particular type are collectively called the generation file set for that type. The files in the file set are the members of that set.

File sets have names specific to the type and generation epoch. The names are constructed from three concatenated elements prefix, filename and suffix:

prefix

The directory path specified in the statsdir command.

name

The name specified by the file option of the filegen command.

suffix

A string of elements beginning with . (dot) followed by a number of elements depending on the file set type.

There is a visualization tool, ntpviz, which assists in making sense of statistics files.

Monitoring Commands and Options

Unless noted otherwise, further information about these commands is on the Event Messages and Status Codes page.

statistics name…

Enables writing of statistics records. Currently, eight kinds of name statistics are supported.

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:

49213 525.624 SPECTRACOM(1) 93 226 00:08:29.606

Item

Units

Description

49213

MJD

modified Julian day number

525.624

s

time of day (s) past midnight UTC

SPECTRACOM(1)

receiver identifier (Spectracom unit 1)

93 226 00:08:29.606

timecode (format varies by refclock)

The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The next normally shows clock type and unit (but if you are running in strict Classic compatibility mode it will show the magic clock address in dotted-quad notation). The final field 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.

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:

50935 75440.031 0.000006019 13.778190 0.000351733 0.0133806

Item

Units

Description

50935

MJD

date

75440.031

s

time past midnight

0.000006019

s

clock offset

13.778

PPM

drift (frequency offset)

0.000351733

s

RMS jitter

0.013380

PPM

RMS frequency jitter (aka wander)

6

log2 s

clock discipline loop time constant

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.

protostats

Record significant peer and system events. Each significant event appends one line to the protostats file set:

49213 525.624 128.4.1.1 963a 8a message

Item

Units

Description

49213

MJD

date

525.624

s

time past midnight

128.4.1.1

IP

source address (0.0.0.0 for system)

963a

code

status word

8a

code

event message code

message

text

event message

The event message code and message field are described on the "Event Messages and Status Words" page.

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:

48773 10847.650 SPECTRACOM(4) 9714 -0.001605376 0.000000000
    0.001424877 0.000958674

Item

Units

Description

48773

MJD

date

10847.650

s

time past midnight

SPECTRACOM(4)

clock name (unit) or source address

9714

hex

status word

-0.001605376

s

clock offset

0.000000000

s

roundtrip delay

0.001424877

s

dispersion

0.000958674

s

RMS jitter

The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The third field shows the reference clock type and unit number (but if you are running in the peer address in dotted-quad notation instead) The fourth field is a status word, encoded in hex in the format described in Appendix A of the NTP specification RFC 1305. The final four fields show the offset, delay, dispersion and RMS jitter, all in seconds.

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:

56285 54575.160 128.4.1.1 192.168.1.5 3565350574.400229473
    3565350574.442385200 3565350574.442436000
    3565350575.154505763 0 4 4 1 8 -21 0.000000 0.000320
    PPS 0

Item

Units

Description

56285

MJD

date

54575.160

s

time past midnight

128.4.1.1

IP

source address

192.168.1.5

IP

destination address

3565350574.400229473

NTP s

origin timestamp

3565350574.442385200

NTP s

receive timestamp

3565350574.442436000

NTP s

transmit timestamp

3565350575.154505763

NTP s

destination timestamp

0

0: OK, 1: insert pending, 2: delete pending, 3: not synced

leap warning indicator

4

4 was current in 2012

NTP version

4

3: client, 4: server, 6: ntpq

mode

1

1-15, 16: not synced

stratum

8

log2 seconds

poll

-21

log2 seconds

precision

0.000000

seconds

total roundtrip delay from the remote server to the primary reference clock

0.000320

seconds

total dispersion from the remote server to the primary reference clock

.PPS.

IP or text

refid, association ID

0

integer

lost packets since last response

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 identification 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.

sysstats

Enables recording of ntpd statistics counters on a periodic basis. Each hour a line of the following form is appended to the file generation set named sysstats:

50928 2132.543 36000 81965 0 9546 56 71793 512 540 10 147 1

Item

Units

Description

50928

MJD

date

2132.543

s

time past midnight

3600

s

time since reset

81965

#

packets received

0

#

packets for this host

9546

#

current versions

56

#

old version

512

#

access denied

540

#

bad length or format

10

#

bad authentication

4

#

declined

147

#

rate exceeded

1

#

kiss-o'-death packets sent

The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The remaining ten fields show the statistics counter values accumulated since the last generated line.

usestats

Enables recording of ntpd resource usage statistics. Each hour a line of the following form is appended to the file generation set named usestats:

57570 83399.541 3600 0.902 1.451 164 0 0 0 2328 64226 1 0 4308

Item

Units

Description

57570

MJD

date

83399.541

s

time past midnight

3600

s

time since reset

0.902

s

ru_utime: CPU seconds - user mode

1.451

s

ru_stime: CPU seconds - system

164

#

ru_minflt: page faults - reclaim/soft (no I/O)

0

#

ru_majflt: page faults - I/O

0

#

ru_nswap: process swapped out

0

#

ru_inblock: file blocks in

2328

#

ru_oublock: file blocks out

64226

#

ru_nvcsw: context switches, wait

1

#

ru_nivcsw: context switches, preempts

0

#

ru_nsignals: signals

4308

#

ru_maxrss: resident set size, kilobytes

The first two fields show the date (Modified Julian Day) and time (seconds and fraction past UTC midnight). The ru_ tags are the names from the rusage struct. See man getrusage for details. (The NetBSD and FreeBSD man pages have more details.) The maxrss column is the high water mark since the process was started. The remaining fields show the values used since the last report.

timingstats

(Only available when the daemon is compiled with process time debugging support (--enable-debug-timing - costs performance). Record processing time statistics for various selected code paths.

53876 36.920 10.0.3.5 1 0.000014592 input processing delay

Item

Units

Description

53876

MJD

date

36.920

s

time past midnight

10.0.3.5

IP

server address

1

#

event count

0.000014592

s

total time

message

text

code path description (see source)

statsdir 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.

filegen name [file filename] [type typename] [link | nolink] [enable | disable]

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 ntpd. (Most important: they can be removed to free space for new data produced.)

Note that this command can be sent from the ntpq(1) program running at a remote location.

name

This is the type of the statistics records, as shown in the statistics command.

file filename

This is the file name for the statistics records. Filenames of set members are built from three concatenated elements prefix, filename and suffix:

prefix

This is a constant filename path. It is not subject to modifications via the 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 statsdir option explained above.

filename

This string is directly concatenated to the prefix mentioned above (no intervening ‘/’). This can be modified using the file argument to the filegen statement. No .. elements are allowed in this component to prevent filenames referring to parts outside the filesystem hierarchy denoted by prefix.

suffix

This part is reflects individual elements of a file set. It is generated according to the type of a file set.

type typename

A file generation set is characterized by its type. The following types are supported:

none

The file set is actually a single plain file.

pid

One element of file set is used per incarnation of a ntpd 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 ntpd(8) server incarnations. The set member filename is built by appending a ‘.’ to concatenated prefix and filename strings, and appending the decimal representation of the process ID of the ntpd(8) server process.

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 ‘.’ 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 prefix filename.19921210.

week

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 W, and a 2-digit week number. For example, information from January, 10th 1992 would end up in a file with suffix 1992W1.

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.

year

One generation file element is generated per year. The filename suffix consists of a dot and a 4 digit year number.

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 is running at the start of the corresponding 24-hour period.

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 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.

enable | disable

Enables or disables the recording function. Information is only written to a file generation by specifying enable; output is prevented by specifying disable.


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