ntpq man page

ntpq — standard NTP query program

Synopsis

ntpq [-flags] [-flag [value]] [--option-name[[=| ]value]] [ host ...]

Description

The ntpq utility program is used to query NTP servers which implement the standard NTP mode 6 control message formats defined in Appendix B of the NTPv3 specification RFC1305, requesting information about current state and/or changes in that state. The same formats are used in NTPv4, although some of the variables have changed and new ones added. The description on this page is for the NTPv4 variables. The program may be run either in interactive mode or controlled using command line arguments. Requests to read and write arbitrary variables can be assembled, with raw and pretty-printed output options being available. The ntpq utility can also obtain and print a list of peers in a common format by sending multiple queries to the server. If one or more request options is included on the command line when ntpq is executed, each of the requests will be sent to the NTP servers running on each of the hosts given as command line arguments, or on localhost by default. If no request options are given, ntpq will attempt to read commands from the standard input and execute these on the NTP server running on the first host given on the command line, again defaulting to localhost when no other host is specified. The ntpq utility will prompt for commands if the standard input is a terminal device. ntpq uses NTP mode 6 packets to communicate with the NTP server, and hence can be used to query any compatible server on the network which permits it. Note that since NTP is a UDP protocol this communication will be somewhat unreliable, especially over large distances in terms of network topology. The ntpq utility makes one attempt to retransmit requests, and will time requests out if the remote host is not heard from within a suitable timeout time. Specifying a command line option other than -i or -n will cause the specified query (queries) to be sent to the indicated host(s) immediately. Otherwise, ntpq will attempt to read interactive format commands from the standard input.

Internal Commands

Interactive format commands consist of a keyword followed by zero to four arguments. Only enough characters of the full keyword to uniquely identify the command need be typed. A number of interactive format commands are executed entirely within the ntpq utility itself and do not result in NTP mode 6 requests being sent to a server. These are described following.

? [command_keyword]
help [command_keyword]
A ‘?’ by itself will print a list of all the command keywords known to this incarnation of ntpq. A ‘?’ followed by a command keyword will print function and usage information about the command. This command is probably a better source of information about ntpq than this manual page.
addvars variable_name[=value] ...
rmvars variable_name ...
clearvars
showvars
The data carried by NTP mode 6 messages consists of a list of items of the form ‘variable_name=value’, where the ‘=value’ is ignored, and can be omitted, in requests to the server to read variables. The ntpq utility maintains an internal list in which data to be included in control messages can be assembled, and sent using the readlist and writelist commands described below. The addvars command allows variables and their optional values to be added to the list. If more than one variable is to be added, the list should be comma-separated and not contain white space. The rmvars command can be used to remove individual variables from the list, while the clearlist command removes all variables from the list. The showvars command displays the current list of optional variables.
authenticate [yes | no]
Normally ntpq does not authenticate requests unless they are write requests. The command ‘authenticate yes’ causes ntpq to send authentication with all requests it makes. Authenticated requests causes some servers to handle requests slightly differently, and can occasionally melt the CPU in fuzzballs if you turn authentication on before doing a peer display. The command ‘authenticate’ causes ntpq to display whether or not ntpq is currently autheinticating requests.
cooked
Causes output from query commands to be "cooked", so that variables which are recognized by ntpq will have their values reformatted for human consumption. Variables which ntpq thinks should have a decodable value but didn't are marked with a trailing ‘?’.
debug [more | less | off]
With no argument, displays the current debug level. Otherwise, the debug level is changed to the indicated level.
delay milliseconds
Specify a time interval to be added to timestamps included in requests which require authentication. This is used to enable (unreliable) server reconfiguration over long delay network paths or between machines whose clocks are unsynchronized. Actually the server does not now require timestamps in authenticated requests, so this command may be obsolete.
exit
Exit ntpq.
host hostname
Set the host to which future queries will be sent. hostname may be either a host name or a numeric address.
hostnames [yes | no]
If yes is specified, host names are printed in information displays. If no is specified, numeric addresses are printed instead. The default is yes, unless modified using the command line -n switch.
keyid keyid
This command allows the specification of a key number to be used to authenticate configuration requests. This must correspond to the controlkey key number the server has been configured to use for this purpose.
keytype [md5 | OpenSSLDigestType]
Specify the type of key to use for authenticating requests. md5 is alway supported. If ntpq was built with OpenSSL support, any digest type supported by OpenSSL can also be provided. If no argument is given, the current keytype is displayed.
ntpversion [1 | 2 | 3 | 4]
Sets the NTP version number which ntpq claims in packets. Defaults to 3, and note that mode 6 control messages (and modes, for that matter) didn't exist in NTP version 1. There appear to be no servers left which demand version 1. With no argument, displays the current NTP version that will be used when communicating with servers.
passwd
This command prompts you to type in a password (which will not be echoed) which will be used to authenticate configuration requests. The password must correspond to the key configured for use by the NTP server for this purpose if such requests are to be successful.
quit
Exit ntpq.
raw
Causes all output from query commands is printed as received from the remote server. The only formating/interpretation done on the data is to transform nonascii data into a printable (but barely understandable) form.
timeout milliseconds
Specify a timeout period for responses to server queries. The default is about 5000 milliseconds. Note that since ntpq retries each query once after a timeout, the total waiting time for a timeout will be twice the timeout value set.
version
Print the version of the ntpq program.

Control Message Commands

Association IDs are used to identify system, peer and clock variables. System variables are assigned an association ID of zero and system name space, while each association is assigned a nonzero association ID and peer namespace. Most control commands send a single mode-6 message to the server and expect a single response message. The exceptions are the peers command, which sends a series of messages, and the mreadlist and mreadvar commands, which iterate over a range of associations.

associations

Display a list of mobilized associations in the form:

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authinfo
Display the authentication statistics.
clockvar assocID [name[=value] [] ...]
cv assocID [name[=value] [] ...]
Display a list of clock variables for those associations supporting a reference clock.
:config [...]
Send the remainder of the command line, including whitespace, to the server as a run-time configuration command in the same format as a line in the configuration file. This command is experimental until further notice and clarification. Authentication is of course required.
config-from-file filename
Send the each line of filename to the server as run-time configuration commands in the same format as a line in the configuration file. This command is experimental until further notice and clarification. Authentication is required.
ifstats
Display statistics for each local network address. Authentication is required.
iostats
Display network and reference clock I/O statistics.
kerninfo
Display kernel loop and PPS statistics. As with other ntpq output, times are in milliseconds. The precision value displayed is in milliseconds as well, unlike the precision system variable.
lassociations
Perform the same function as the associations command, except display mobilized and unmobilized associations.
lopeers [-4 | -6]
Obtain and print a list of all peers and clients showing dstadr (associated with any given IP version).
lpeers [-4 | -6]
Print a peer spreadsheet for the appropriate IP version(s). dstadr (associated with any given IP version).
monstats
Display monitor facility statistics.
mrulist [limited | kod | mincount=count | laddr=localaddr | sort=sortorder | resany=hexmask | resall=hexmask]

Obtain and print traffic counts collected and maintained by the monitor facility. With the exception of sort=sortorder, the options filter the list returned by ntpd. The limited and kod options return only entries representing client addresses from which the last packet received triggered either discarding or a KoD response. The mincount=count option filters entries representing less than count packets. The laddr=localaddr option filters entries for packets received on any local address other than localaddr. resany=hexmask and resall=hexmask filter entries containing none or less than all, respectively, of the bits in hexmask, which must begin with 0x. The sortorder defaults to lstint and may be any of addr, count, avgint, lstint, or any of those preceded by a minus sign (hyphen) to reverse the sort order. The output columns are:

Column
Description
lstint
Interval in s between the receipt of the most recent packet from this address and the completion of the retrieval of the MRU list by ntpq.
avgint
Average interval in s between packets from this address.
rstr
Restriction flags associated with this address. Most are copied unchanged from the matching restrict command, however 0x400 (kod) and 0x20 (limited) flags are cleared unless the last packet from this address triggered a rate control response.
r
Rate control indicator, either a period, L or K for no rate control response, rate limiting by discarding, or rate limiting with a KoD response, respectively.
m
Packet mode.
v
Packet version number.
count
Packets received from this address.
rport
Source port of last packet from this address.
remote address
DNS name, numeric address, or address followed by claimed DNS name which could not be verified in parentheses.
mreadvar assocID assocID [variable_name[=value]] ...
mrv assocID assocID [variable_name[=value]] ...
Perform the same function as the readvar command, except for a range of association IDs. This range is determined from the association list cached by the most recent associations command.
opeers [-4 | -6]
Obtain and print the old-style list of all peers and clients showing dstadr (associated with any given IP version), rather than the refid.
passociations
Perform the same function as the associations command, except that it uses previously stored data rather than making a new query.
peers

Display a list of peers in the form:

Variable
Description
[tally]
single-character code indicating current value of the select field of the
remote
host name (or IP number) of peer. The value displayed will be truncated to 15 characters unless the -w flag is given, in which case the full value will be displayed on the first line, and the remaining data is displayed on the next line.
refid
association ID or
st
stratum
t
u: unicast or manycast client, b: broadcast or multicast client, l: local (reference clock), s: symmetric (peer), A: manycast server, B: broadcast server, M: multicast server
when
sec/min/hr since last received packet
poll
poll interval (log2 s)
reach
reach shift register (octal)
delay
roundtrip delay
offset
offset of server relative to this host
jitter
jitter
apeers
Display a list of peers in the form: where the output is just like the peers command except that the refid is displayed in hex format and the association number is also displayed.
pstats assocID
Show the statistics for the peer with the given assocID.
readlist assocID
rl assocID
Read the system or peer variables included in the variable list.
readvar assocID name[=value] [, ...]
rv assocID name[=value] [, ...]
Display the specified variables. If assocID is zero, the variables are from the System Variables name space, otherwise they are from the Peer Variables name space. The assocID is required, as the same name can occur in both spaces. If no name is included, all operative variables in the name space are displayed. In this case only, if the assocID is omitted, it is assumed zero. Multiple names are specified with comma separators and without whitespace. Note that time values are represented in milliseconds and frequency values in parts-per-million (PPM). Some NTP timestamps are represented in the format YYYYMMDDTTTT , where YYYY is the year, MM the month of year, DD the day of month and TTTT the time of day.
reslist
Show the access control (restrict) list for ntpq.
saveconfig filename
Write the current configuration, including any runtime modifications given with :config or config-from-file, to the ntpd host's file filename. This command will be rejected by the server unless appears in the ntpd configuration file. filename can use strftime() format specifies to substitute the current date and time, for example, q]saveconfig ntp-%Y%m%d-%H%M%S.confq]. The filename used is stored in system variable savedconfig. Authentication is required.
timerstats
Display interval timer counters.
writelist assocID
Write the system or peer variables included in the variable list.
writevar assocID name=value [, ...]
Write the specified variables. If the assocID is zero, the variables are from the System Variables name space, otherwise they are from the Peer Variables name space. The assocID is required, as the same name can occur in both spaces.
sysinfo
Display operational summary.
sysstats
Print statistics counters maintained in the protocol module.

Status Words and Kiss Codes

The current state of the operating program is shown in a set of status words maintained by the system. Status information is also available on a per-association basis. These words are displayed in the rv and as commands both in hexadecimal and in decoded short tip strings. The codes, tips and short explanations are documented on the page. The page also includes a list of system and peer messages, the code for the latest of which is included in the status word.

Information resulting from protocol machine state transitions is displayed using an informal set of ASCII strings called The original purpose was for kiss-o'-death (KoD) packets sent by the server to advise the client of an unusual condition. They are now displayed, when appropriate, in the reference identifier field in various billboards.

System Variables

The following system variables appear in the rv billboard. Not all variables are displayed in some configurations.

Variable
Description
status
version
NTP software version and build time
processor
hardware platform and version
system
operating system and version
leap
leap warning indicator (0-3)
stratum
stratum (1-15)
precision
precision (log2 s)
rootdelay
total roundtrip delay to the primary reference clock
rootdisp
total dispersion to the primary reference clock
peer
system peer association ID
tc
time constant and poll exponent (log2 s) (3-17)
mintc
minimum time constant (log2 s) (3-10)
clock
date and time of day
refid
reference ID or
reftime
reference time
offset
combined offset of server relative to this host
sys_jitter
combined system jitter
frequency
frequency offset (PPM) relative to hardware clock
clk_wander
clock frequency wander (PPM)
clk_jitter
clock jitter
tai
TAI-UTC offset (s)
leapsec
NTP seconds when the next leap second is/was inserted
expire
NTP seconds when the NIST leapseconds file expires

The jitter and wander statistics are exponentially-weighted RMS averages. The system jitter is defined in the NTPv4 specification; the clock jitter statistic is computed by the clock discipline module.

When the NTPv4 daemon is compiled with the OpenSSL software library, additional system variables are displayed, including some or all of the following, depending on the particular Autokey dance:

Variable
Description
host
Autokey host name for this host
ident
Autokey group name for this host
flags
host flags (see Autokey specification)
digest
OpenSSL message digest algorithm
signature
OpenSSL digest/signature scheme
update
NTP seconds at last signature update
cert
certificate subject, issuer and certificate flags
until
NTP seconds when the certificate expires

Peer Variables

The following peer variables appear in the rv billboard for each association. Not all variables are displayed in some configurations.

Variable
Description
associd
association ID
status
srcadr
source (remote) IP address
srcport
source (remote) port
dstadr
destination (local) IP address
dstport
destination (local) port
leap
leap indicator (0-3)
stratum
stratum (0-15)
precision
precision (log2 s)
rootdelay
total roundtrip delay to the primary reference clock
rootdisp
total root dispersion to the primary reference clock
refid
reference ID or
reftime
reference time
reach
reach register (octal)
unreach
unreach counter
hmode
host mode (1-6)
pmode
peer mode (1-5)
hpoll
host poll exponent (log2 s) (3-17)
ppoll
peer poll exponent (log2 s) (3-17)
headway
headway (see
flash
offset
filter offset
delay
filter delay
dispersion
filter dispersion
jitter
filter jitter
ident
Autokey group name for this association
bias
unicast/broadcast bias
xleave
interleave delay (see

The bias variable is calculated when the first broadcast packet is received after the calibration volley. It represents the offset of the broadcast subgraph relative to the unicast subgraph. The xleave variable appears only for the interleaved symmetric and interleaved modes. It represents the internal queuing, buffering and transmission delays for the preceding packet.

When the NTPv4 daemon is compiled with the OpenSSL software library, additional peer variables are displayed, including the following:

Variable
Description
flags
peer flags (see Autokey specification)
host
Autokey server name
flags
peer flags (see Autokey specification)
signature
OpenSSL digest/signature scheme
initsequence
initial key ID
initkey
initial key index
timestamp
Autokey signature timestamp

Clock Variables

The following clock variables appear in the cv billboard for each association with a reference clock. Not all variables are displayed in some configurations.

Variable
Description
associd
association ID
status
device
device description
timecode
ASCII time code string (specific to device)
poll
poll messages sent
noreply
no reply
badformat
bad format
baddata
bad date or time
fudgetime1
fudge time 1
fudgetime2
fudge time 2
stratum
driver stratum
refid
driver reference ID
flags
driver flags

Options

-4, --ipv4
Force IPv4 DNS name resolution. This option must not appear in combination with any of the following options: ipv6.

Force DNS resolution of following host names on the command line to the IPv4 namespace.
-6, --ipv6
Force IPv6 DNS name resolution. This option must not appear in combination with any of the following options: ipv4.

Force DNS resolution of following host names on the command line to the IPv6 namespace.
-c cmd, --command=cmd
run a command and exit. This option may appear an unlimited number of times.

The following argument is interpreted as an interactive format command and is added to the list of commands to be executed on the specified host(s).
-d, --debug-level
Increase debug verbosity level. This option may appear an unlimited number of times.
-D number, --set-debug-level=number
Set the debug verbosity level. This option may appear an unlimited number of times. This option takes an integer number as its argument.
-i, --interactive
Force ntpq to operate in interactive mode. This option must not appear in combination with any of the following options: command, peers.

Force ntpq to operate in interactive mode. Prompts will be written to the standard output and commands read from the standard input.
-n, --numeric
numeric host addresses.

Output all host addresses in dotted-quad numeric format rather than converting to the canonical host names.
--old-rv
Always output status line with readvar.

By default, ntpq now suppresses the associd=... line that precedes the output of readvar (alias rv) when a single variable is requested, such as ntpq -c "rv 0 offset". This option causes ntpq to include both lines of output for a single-variable readvar. Using an environment variable to preset this option in a script will enable both older and newer ntpq to behave identically in this regard.
-p, --peers
Print a list of the peers. This option must not appear in combination with any of the following options: interactive.

Print a list of the peers known to the server as well as a summary of their state. This is equivalent to the 'peers' interactive command.
-r keyword, --refid=keyword

Set default display type for S2+ refids. This option takes a keyword as its argument. The argument sets an enumeration value that can be tested by comparing them against the option value macro. The available keywords are:

hash ipv4

or their numeric equivalent.

The default keyword for this option is:

ipv4

Set the default display format for S2+ refids.
-w, --wide
Display the full 'remote' value.

Display the full value of the 'remote' value. If this requires more than 15 characters, display the full value, emit a newline, and continue the data display properly indented on the next line.
-?, --help
Display usage information and exit.
-!, --more-help
Pass the extended usage information through a pager.
-> [cfgfile], --save-opts [=cfgfile]
Save the option state to cfgfile. The default is the last configuration file listed in the Option Presets section, below. The command will exit after updating the config file.
-< cfgfile, --load-opts=cfgfile, --no-load-opts
Load options from cfgfile. The no-load-opts form will disable the loading of earlier config/rc/ini files. --no-load-opts is handled early, out of order.
--version [{v|c|n}]
Output version of program and exit. The default mode is `v', a simple version. The `c' mode will print copyright information and `n' will print the full copyright notice.

Option Presets

Any option that is not marked as not presettable may be preset by loading values from configuration ("RC" or ".INI") file(s) and values from environment variables named:

NTPQ_<option-name> or NTPQ

The environmental presets take precedence (are processed later than) the configuration files. The homerc files are "$HOME", and ".". If any of these are directories, then the file .ntprc is searched for within those directories.

Environment

See Option Presets for configuration environment variables.

Files

See Option Presets for configuration files.

Exit Status

One of the following exit values will be returned:

0 (EXIT_SUCCESS)
Successful program execution.
1 (EXIT_FAILURE)
The operation failed or the command syntax was not valid.
66 (EX_NOINPUT)
A specified configuration file could not be loaded.
70 (EX_SOFTWARE)
libopts had an internal operational error. Please report it to autogen-users@lists.sourceforge.net. Thank you.

Authors

The University of Delaware and Network Time Foundation

Bugs

Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org

Notes

This manual page was AutoGen-erated from the ntpq option definitions.

Referenced By

ntp.conf(5), ntpd(8), ntpdc(8), ntp-keygen(8), ntp.keys(5), ntpstat(8).

21 Nov 2016 4.2.8p9 User Commands