Ntpq output units. Lower stratum numbers indicate more accurate time sources.
Ntpq output units.
Start your NTP daemon.
Ntpq output units 634 estimated error: 0. 016 ms for nodeA1 Please, edit your question and also paste the output of ntpq -pn command. -p Print a list of the peers known to the server as well as a summary of their state. Some interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode 6 requests being sent to a server. This option must not appear in combination with any of the following options The ntpq command is a standard utility for monitoring Network Time Protocol (NTP) daemon, ntpd. ntpq will prompt for commands if the standard input is a terminal device. Using an environment variable to preset this option in a script will enable both older and newer ntpq to behave identi- Force ntpq to operate in interactive mode. Type the following command on your Linux or Unix-based system: $ ntpq -pn OR $ ntpq -p Sample outputs: This option causes ntpq to include both lines of output for a single-variable readvar. 22. 6p5) to nanosecond In any case, you must use some tools to grep ‘n sed through the output to extract exactly the values you are interested in. 163, 0. ntpq [ -inp ] [ -c command] [ host] [ . Requests to read and write arbitrary variables can be ntpq -np. 306155”. txt Use a cron job to automate the logging: crontab -e # Add the following line to log every hour 0 * * * * ntpq -p >> /var/log/ntp_log. txt Cheatsheet. The achieved resolution is thus 2 precision (seconds) Force ntpq to operate in interactive mode. At last, the system has reached that exalted state, and all is well with the world. 306”, while a newer ntpq is returning “offset=-0. peer sys_peer 2 ntpq> rv 2378 associd=2378 status=962a conf, reach, sel_sys. Last Activity: 27 March 2012, 6:20 AM EDT. 022 kernel status: pll nano pll time constant: 9 precision: 1e-06 frequency tolerance: 500 pps frequency: 0 pps stability: 0 pps jitter: 0 calibration interval 0 calibration cycles An example set of output: ntpq> pe remote refid st t when poll reach delay offset jitter ===== *10. Initial Startup. Description. Thanked 0 Times in 0 Posts A stratum-0 is an actual time source. Multiple -c options may be given. Some interactive format ntpq - standard NTP query program SYNOPSIS ntpq [-46adhinpkwWu] [-c command] [host] [] DESCRIPTION The ntpq utility program is used to monitor NTP daemon ntpd operations and The time resolution achieved and other parameters for a host (host hardware and operating system limited) is reported by the command “ntpq -c rl” (see rfc1305 Common Variables and rfc5905). 关于ntp同步时间, 由于是解决问题，所以理论性内容不多。 关于UTC NTP要提供准确的时间，就必须有准确的时间来源，那可以用格林尼治时间吗？答案是否定的。 因为格林尼治时间是以地球自转为基础的时间计量系统，但是地球每天的自转是有些不规则的， 而且正在缓慢加速，因此，格林尼治时间 However in the ntpq output the prefer server has better offset and jitter, even then it is not chosen. Systems that use stratum-2 servers as their time source are stratum-3, so on and so forth. Overall, ntpq is a powerful command-line utility that helps administrators monitor and manage NTP servers to ensure precise timekeeping and synchronization in network You can use ntpdc -c sysinfo command for querying ntpd status. The following is an example of a successful NTP peer server query. 这篇文章主要介绍了 Linux 系统中 ntpq 命令的使用， ntpq 命令可以用来处理各种时间之间的同步和换算，非常强大，需要的朋友可以参考下. We have got the below output when running the command on the system. This flag is excluded from runtime configuration using ntpq. Is it possible to identify that on what basis it is rejecting preferred server in this case. EDIT -1. 145 0. 84] reference time: 00000000. refid: Reference ID, a code representing the stratum and source of the time information. The ntpd daemon can operate in two modes, depending on the presence of the -n command-line option. Judging from your output, it looks you have two NTP servers which declare themselves as stratum 1, but do Requests to read and write arbitrary variables can be assembled, with raw and pretty-printed output options being available. Synopsis. 10. Not too long ago only high-dollar commercial GPS units supplied a highly accurate pulse-per-second (PPS) time signal but now it's a common feature in inexpensive GPS chips. The command ntpq -c 'rv 0 offset' can be used to retrieve the current estimated time offset with nanosecond resolution, e. Without the option the daemon detaches from the controlling terminal and proceeds autonomously. A number of interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode-6 requests being sent The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a <, followed by a file name, to the command line. The ntpq output does show positive and negative values. ntpq is used to query NTP servers which implement the recommended NTP mode 6 control message format about current state and to request changes in that state. The ntpq utility program is used to query NTP servers which implement the standard NTP mode 6 control message formats defined in Appendix B ntpq to include both lines of output for a single-variable read- var. The program can be run either in interactive mode or controlled using command line arguments. 005928 pll frequency: 11. Also jumping-off point to the official NTP documentation and FAQ, community documentation The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. 1 Invoking ntpq. 199. 000. This option must not appear in combination with any of the following options Start your NTP daemon. A number of interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode 6 requests being sent ntpq [options] [host] Common options include:-p – Print a list of NTP peers and basic stats-c – Run a command and output the result -i – Start an interactive terminal mode-n – Show IP addresses instead of hostnames ; If no host is specified, ntpq will contact the local NTP daemon by default. We're looking for the GPS offset to stay below +/-200ms (0. " then ntpd hasn't yet connected to the server; If the output does NOT The output of a subcommand goes to standard output, but you can redirect the output of individual subcommands to a file by appending a > (greater than sign), followed by a file name, to the command line. 5873 maximum error: 284. The output of a subcommand goes to standard output, but you can redirect the output of individual subcommands to a file by appending a > (greater than sign), followed by a file name, to the command line. A number of interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode-6 requests being sent whether the unit is connected to the internet or not will have no bearing on how NTP uses the GPS time source if it is available: it will always prefer the stratum that is available with the lowest number, where GPS is stratum 0 (column 3 in the ntpq output). 00000000 Thu, Feb 7 2036 8:28:16. Using an environment variable to preset this option in a script will enable both older and newer ntpq to behave identically in this regard. 复制代码. Prompts will be written to the standard output and commands read from the standard input. Observe the output with references presented in the previous table. Thus, even if the server given in your example (10. 2. remote refid st t when poll reach delay offset jitter The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. Some old ntpq might return something like “offset=-0. Start `ntpq` in interactive mode: # ntpq - The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. st: Stratum level of the remote server. 000 0. STEP. 42. The ntpq program provides the same capabilities as ntpdc using standard mode 6 requests. -p, --peers Print a list of the peers. with raw and pretty-printed output options being available. I think cgps is reporting values directly from the GPS source. 000 system flags: auth monitor ntp kernel stats The output of a subcommand goes to standard output, but you can redirect the output of individual subcommands to a file by appending a > (greater than sign), followed by a file name, to the command line. The further from the source, the less accurate the devices become. ntpq Command Examples. It provides a powerful interface to query and control the ntpd daemon, allowing users to examine the current state of the NTP system, including information about synchronized time sources, offset, jitter, and the overall health of the NTP network. Systems that use a stratum-1 system as their time source are stratum-2. Some interactive format Force ntpq to operate in interactive mode. 00000 s root dispersion: 338. 1. 78. If you are seeing an offset of The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. Your ntpq output on the ubuntu machine is showing a jitter of hundreds of milliseconds for all of its servers, even though they have low delay, which indicates either a very unreliable network, a conspiracy of all of the servers to provide erratic time, or a basic timekeeping problem on the server itself. Requests to read and write arbitrary variables can be The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. Top Forums UNIX for Advanced & Expert Users output of ntpq -p # 1 03-19-2009 thepurple. discarded by intersection algorithm. Basically, “ntpq -c rv NTP 协议是高精度的，使用的精度小于纳秒（2的 -32 次方）。主机的时间精度和其他参数（受硬件和操作系统限制）使用命令 “ntpq -c rl” 查看（参见 rfc1305 通用变量和 rfc5905）。 “ntpq -c rl”输出参数. The ntpq utility program is used to monitor NTP daemon ntpd operations and determine performance. 1. You can also connect to remote NTP servers to query their status as well. PPS. 44917 s reference ID: [73. The program may be run either in interactive mode or controlled using command line arguments. 182) exactly is the peer that is returned with assoc id 0 That's the existing cronjob that you want to modify to avoid sending email (presumably by not exiting with a failure) when you see ntpq: read: Connection refused in the ntpq output? Are you trying to use the output in offsets for this check? What have you tried exactly? Is that output sent to standard output or standard error? – Requests to read and write arbitrary variables can be assembled, with raw and pretty-printed output options being available. service Then check the ntpservice is running and able to reach the NTP servers: ntpstat[ENTER] If you get this response, NTP is working normally: synchronised to NTP server (85. The refid is the ultimate time source used. The ntpq utility program is used to query NTP servers to monitor NTP NTP Client sends NTP packets at intervals ranging from 8 s to 36 hr. Extending the displayed offset from microsecond (up to at least ntp-4. 命令 "ntpq -q" 输出下面这样的一个表：. ntpq uses NTP mode 6 packets to Why are ntpq -p and ntpstat showing different outputs of time differences and stratum value at all the times? And what does it mean "unspecified in the result from ntpstat", which one to believe? Please refer to this output: ntpstat. -n Output all host addresses in dotted-quad numeric format rather than converting to the canonical host names. Using an environment variable to preset this op- tion in a script will enable both older and newer ntpq to be- have identically in this regard. A number of interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode 6 requests being sent I've never used ntpstat (it's not a standard install on debian/ubuntu) but have used ntp for many years and generally look at the output of ntpq -nc peer or ntpq -np which probably shows similar information. It uses the standard NTP mode 6 control message formats defined in Appendix B of the NTPv3 specification RFC1305. Basic command: ntpq -p; View server variables: ntpq -c "rv" ntpq can also be used to display information about the state of the NTP clock, including the estimated accuracy of the clock, the current time, and the status of the clock discipline algorithm. We further found syslog for mentioning the choice of 169. The default for this flag is disable. 0. Checking the status of NTP with ntpq command. For instance, to query an NTP server, use the -p parameter: This command displays a list of peers The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. This option must not appear in com- bination with any of the following Synopsis. As for getting the connection from the GPS to ntpd, I’m going to refer to this document created by Eric Raymond as part of his work on the NTPSEC project. x denotes sel_falsetick, which is described as:. Posts: 163 Thanks Given: 4. 142 ntpq> as ind assid status conf reach auth condition last_event cnt ===== 1 2378 962a yes yes none sys. It is an octal representation. For reference, see the documentation on the Select Field values, where the T column documents the codes associated with each value. peer, 2 在生产环境中，通过网络种的时钟服务器来同步所有服务器的系统时钟是很常用的一种时钟同步方式，本文不探讨ntp服务器的架设，而是带大家解读一下作为时钟客户端的服务器上常用的命令行工具ntpq -p的输出内容。. -i Force ntpq to operate in interactive mode. 20 3 u 367 1024 377 0. “ntpq -c rl” output parameters: precision is rounded to give the next larger integer power of two. The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. reach: The reach peer variable is an 8-bit shift register displayed in octal format. It provides information about NTP peers, system variables, and can be used in interactive or debugging mode. When a valid packet is Once again I had to google what a specific character meant (“o”) in the output from ntpq, here’s my output: pi@ntp1:~ $ ntpq -pn remote refid st t when poll reach delay offset jitter To use the ntpq command, type ntpq followed by the parameters and arguments needed. If one or more request options are included on the command line when ntpq ntpq> kerninfo associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer, pll offset: 0. It returns an output similar to this: system peer: 0. service ntpd restart[ENTER] Redirecting to /bin/systemctl restart ntpd. Each bit in its binary representation is a boolean value, where a 1 indicates a successful transaction and a 0 indicates a failure. Registered User. Curious to see how well it's syncing up, you monitor the output of ntpq (see Listing 1) and watch the reachability statistics in the reach field climb towards the mysterious upper bound of 377. In special circumstances the ntpdc - Once again I had to google what a specific character meant (“o”) in the output from ntpq, here’s my output: pi@ntp1:~ $ ntpq -pn remote refid st t when poll reach delay offset jitter ===== o127. Some interactive format subcommands run entirely within the ntpq query program and do not result in sending NTP mode 6 requests to a server. 0 . precision 为四舍五入值，且为 2 的幂数。因此精度为 2precision So usually, ntpq is giving values from long term observation of the peer (poll interval), while ntpdate is giving a rather short term snapshot. See this for more info on ntpq output description. monitor Enables the NTP official reference implementation (for Unix and Unix-like OSes, with ports to Microsoft Windows NT, VMS, real-time OSes like VxWorks and QNX). precision 為四捨五入值，且為 2 的冪數。因此精度為 2precision This option causes ntpq to include both lines of output for a single-vari- able readvar. 000032 Please note the offset value is displayed in milliseconds, so in the example above the offset is 32 nanoseconds. A number of interactive format commands are executed entirely within the ntpq program itself and do not result in NTP mode-6 requests being sent The output of both commands is the same. 98) at stratum 2 time correct to within 11 ms polling server every 256 s The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. 代码如下:. The ntpq can also obtain and print a list of peers in a common format The leftmost character is the "tally code". INIT. 2 seconds) and we need an asterisk in front of the GPS The value of reach column in ntpq -p or peer command inside ntpq shell represents the status of the last 8 NTP transactions between the NTP daemon and a given remote time server. ntpq uses NTP mode 6 packets to communicate with the NTP server, and hence can be used to query any compatible The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. ntpq -c 'rv 0 offset' offset=-0. the nptq entry with ‘*’ displayed left-most is the current time source being used 详细解读Linux系统中ntpq命令的使用，ntpq命令的使用。详细解读Linux系统中ntpq命令的使用，ntpq命令的使用 这篇文章主要介绍了Linux系统中ntpq命令的使用,ntpq命令可以用来处理各种时间之间的同步和换算,非常强大,需要的朋友可以参考下 命令 ntpq The output of a command is normally sent to the standard output, but optionally the output of individual commands may be sent to a file by appending a >, followed by a file name, to the command line. This page discusses ntpd program monitoring and debugging techniques using the ntpq - standard NTP query program, either on the local server or from a remote machine. The one thing I will mention here is that the offset in ntpq is in milliseconds(ms) and the fudge time1 value is in seconds(s). synchronised to unspecified at stratum 4 time correct to within 17 ms polling server every 8s Asssuming the unit is milliseconds: Then I would have an offset of 0. 127. It can also obtain and print a list of peers in a common format by sending multiple queries to the server. 254. pcap udp port 123 for a few hours or days, and then take a look at the results with Wireshark to see if there are The 'ntpq' command is used to query the Network Time Protocol (NTP) daemon. remote: IP address or hostname of the NTP server. 214. Furthermore, you need to feed those values into your monitoring tool. This option causes ntpq to include both lines of output for a single-variable readvar. 100. ntpq - standard NTP query program. To understand ntpq command output we have run the command “ntpq -p” on the Ubuntu/linux machine, alternatively, we can run the peer argument to get the details. The command helps in 1. You might want to run something like tcpdump -s0 -i any -Knpvv -w ntp-capture. Requests to read and write arbitrary variables can be assembled, with raw and pretty-printed output options being available. It is connected to a server which is a stratum-1 server. 244. g. Join Date: Oct 2007. 096 0. . 51 despite higher stratum as below :- The tool also supports robust filtering options, allowing users to display specific information, sort the results, and customize the output format for better readability. 0 system peer mode: unspec leap indicator: 11 stratum: 16 precision: -20 root distance: 0. Lower stratum numbers indicate more accurate time sources. peer; ntpq -p; Understand ntpq command output – Explanation. If the local ntpd process can communicate, or attempts to communicate with a declared NTP peer server, the output from the ntpq command appears similar to the following example: # ntpq -np Right now I've written a bash script to parse the output of ntpq -np: If the output contains "ntpq: read: Connection refused" then ntpd isn't running; If the output contains "No association ID's returned" then the server address is invalid; If the output contains ". Why don't you use one machine as the primary (internal) NTP server and synchronize all the other machines with this one? – FedKad. NTP 協議是高精度的，使用的精度小於納秒（2的 -32 次方）。主機的時間精度和其他參數（受硬件和操作系統限制）使用命令 “ntpq -c rl” 查看（參見 rfc1305 通用變量和 rfc5905）。 “ntpq -c rl”輸出參數. In general, interpretation of this output requires reference to the sources. 16 u - 1024 0 0. 73. 249 10. -p, --peers Print a list of the peers. : . To log the output of ntpq regularly for historical analysis: ntpq -p >> ntp_log. With one or more -d options the daemon generates special trace output useful for debugging. bhdmatbwqazzlhnejnlhhwjfmqtetnfijoirhnldbxofltzidskgirqgcttcfufmgqgbusnhzhknzfe
