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Merge pull request #13973 from wxy/20190604-How-To-Verify-NTP-Setup-(Sync)-is-Working-or-Not-In-Linux
TSL:20190604 How To Verify NTP Setup (Sync) is Working or Not In Linux
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How To Verify NTP Setup (Sync) is Working or Not In Linux?)
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[#]: via: (https://www.2daygeek.com/check-verify-ntp-sync-is-working-or-not-in-linux-using-ntpq-ntpstat-timedatectl/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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How To Verify NTP Setup (Sync) is Working or Not In Linux?
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======
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NTP stand for Network Time Protocol, which synchronize the clock between computer systems over the network.
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NTP server keep all the servers in your organization in-sync with an accurate time to perform time based jobs.
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NTP client will synchronize its clock to the network time server.
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We had already wrote an article about NTP Server and Client installation and configuration.
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If you would like to check these article, navigate to the following links.
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* **[How To Install And Configure NTP Server And NTP Client In Linux?][1]**
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* **[How To Install And Configure Chrony As NTP Client?][2]**
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I assume that we have already setup NTP server and NTP client using the above links.
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Now, how to verify whether the NTP setup is working correctly or not?
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There are three commands available in Linux to validate the NTP sync. The details are below. In this article, we will tell you, how to verify NTP sync using all these commands.
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* **`ntpq:`** ntpq is standard NTP query program.
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* **`ntpstat:`** It shows network time synchronization status.
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* **`timedatectl:`** It controls the system time and date in systemd system.
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### Method-1: How To Check NTP Status Using ntpq Command?
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The ntpq utility program is used to monitor NTP daemon ntpd operations and determine performance.
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The program can be run either in interactive mode or controlled using command line arguments.
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It prints a list of peers that connected by sending multiple queries to the server.
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If NTP is working properly, you will be getting the output similar to below.
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```
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# ntpq -p
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remote refid st t when poll reach delay offset jitter
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==============================================================================
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*CentOS7.2daygee 133.243.238.163 2 u 14 64 37 0.686 0.151 16.432
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```
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**Details:**
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* **-p:** Print a list of the peers known to the server as well as a summary of their state.
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### Method-2: How To Check NTP Status Using ntpstat Command?
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ntpstat will report the synchronisation state of the NTP daemon (ntpd) running on the local machine.
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If the local system is found to be synchronised to a reference time source, ntpstat will report the approximate time accuracy.
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The ntpstat command returns three kind of status code based on the NTP sync. The details are below.
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* **`0:`**` ` It returns 0 if clock is synchronised.
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* **`1:`**` ` It returns 1 if clock is not synchronised.
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* **`2:`**` ` It returns 2 if clock state is indeterminant, for example if ntpd is not contactable.
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```
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# ntpstat
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synchronised to NTP server (192.168.1.8) at stratum 3
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time correct to within 508 ms
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polling server every 64 s
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```
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### Method-3: How To Check NTP Status Using timedatectl Command?
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**[timedatectl Command][3]** is used to query and change the system clock and its settings in systmed system.
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```
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# timedatectl
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or
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# timedatectl status
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Local time: Thu 2019-05-30 05:01:05 CDT
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Universal time: Thu 2019-05-30 10:01:05 UTC
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RTC time: Thu 2019-05-30 10:01:05
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Time zone: America/Chicago (CDT, -0500)
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NTP enabled: yes
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NTP synchronized: yes
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RTC in local TZ: no
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DST active: yes
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Last DST change: DST began at
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Sun 2019-03-10 01:59:59 CST
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Sun 2019-03-10 03:00:00 CDT
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Next DST change: DST ends (the clock jumps one hour backwards) at
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Sun 2019-11-03 01:59:59 CDT
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Sun 2019-11-03 01:00:00 CST
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```
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### Bonus Tips:
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Chrony is replacement of NTP client.
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It can synchronize the system clock faster with better time accuracy and it can be particularly useful for the systems which are not online all the time.
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chronyd is smaller, it uses less memory and it wakes up the CPU only when necessary, which is better for power saving.
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It can perform well even when the network is congested for longer periods of time.
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You can use any of the below commands to check Chrony status.
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To check chrony tracking status.
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```
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# chronyc tracking
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Reference ID : C0A80105 (CentOS7.2daygeek.com)
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Stratum : 3
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Ref time (UTC) : Thu Mar 28 05:57:27 2019
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System time : 0.000002545 seconds slow of NTP time
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Last offset : +0.001194361 seconds
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RMS offset : 0.001194361 seconds
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Frequency : 1.650 ppm fast
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Residual freq : +184.101 ppm
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Skew : 2.962 ppm
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Root delay : 0.107966967 seconds
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Root dispersion : 1.060455322 seconds
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Update interval : 2.0 seconds
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Leap status : Normal
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```
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Run the sources command to displays information about the current time sources.
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```
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# chronyc sources
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210 Number of sources = 1
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MS Name/IP address Stratum Poll Reach LastRx Last sample
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===============================================================================
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^* CentOS7.2daygeek.com 2 6 17 62 +36us[+1230us] +/- 1111ms
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/check-verify-ntp-sync-is-working-or-not-in-linux-using-ntpq-ntpstat-timedatectl/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://www.2daygeek.com/install-configure-ntp-server-ntp-client-in-linux/
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[2]: https://www.2daygeek.com/configure-ntp-client-using-chrony-in-linux/
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[3]: https://www.2daygeek.com/change-set-time-date-and-timezone-on-linux/
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@ -0,0 +1,143 @@
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[#]: collector: (lujun9972)
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[#]: translator: (wxy)
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[#]: reviewer: ( )
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[#]: publisher: ( )
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[#]: url: ( )
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[#]: subject: (How To Verify NTP Setup (Sync) is Working or Not In Linux?)
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[#]: via: (https://www.2daygeek.com/check-verify-ntp-sync-is-working-or-not-in-linux-using-ntpq-ntpstat-timedatectl/)
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[#]: author: (Magesh Maruthamuthu https://www.2daygeek.com/author/magesh/)
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如何在 Linux 下确认 NTP 是否同步？
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======
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NTP 意即<ruby>网络时间协议<rt>Network Time Protocol</rt></ruby>，它通过网络同步计算机系统之间的时钟。NTP 服务器可以使组织中的所有服务器保持同步，以准确时间执行基于时间的作业。NTP 客户端会将其时钟与 NTP 服务器同步。
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我们已经写了一篇关于 NTP 服务器和客户端安装和配置的文章。如果你想查看这些文章，请导航至以下链接。
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* [如何在 Linux 上安装、配置 NTP 服务器和客户端？][1]
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* [如何安装和配置 Chrony 作为 NTP 客户端？][2]
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我假设我你经使用上述链接设置了 NTP 服务器和 NTP 客户端。现在，如何验证 NTP 设置是否正常工作？
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Linux 中有三个命令可用于验证 NTP 同步情况。详情如下。在本文中，我们将告诉您如何使用所有这些命令验证 NTP 同步。
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* `ntpq`：ntpq 是一个标准的 NTP 查询程序。
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* `ntpstat`：显示网络世界同步状态。
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* `timedatectl`：它控制 systemd 系统中的系统时间和日期。
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### 方法 1：如何使用 ntpq 命令检查 NTP 状态？
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`ntpq` 实用程序用于监视 NTP 守护程序 `ntpd` 的操作并确定性能。
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该程序可以以交互模式运行，也可以使用命令行参数进行控制。它通过向服务器发送多个查询来打印出连接的对等项列表。如果 NTP 正常工作，你将获得类似于下面的输出。
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```
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# ntpq -p
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remote refid st t when poll reach delay offset jitter
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==============================================================================
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*CentOS7.2daygee 133.243.238.163 2 u 14 64 37 0.686 0.151 16.432
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```
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细节：
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* `-p`：打印服务器已知的对等项列表以及其状态摘要。
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### 方法 2：如何使用 ntpstat 命令检查 NTP 状态？
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`ntpstat` 将报告在本地计算机上运行的 NTP 守护程序（`ntpd`）的同步状态。如果发现本地系统与参考时间源保持同步，则 `ntpstat` 将报告大致的时间精度。
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`ntpstat` 命令根据 NTP 同步状态返回三种状态码。详情如下。
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* `0`：如果时钟同步则返回 0。
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* `1`：如果时钟不同步则返回 1。
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* `2`：如果时钟状态不确定，则返回 2，例如 ntpd 不可联系时。
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```
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# ntpstat
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synchronised to NTP server (192.168.1.8) at stratum 3
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time correct to within 508 ms
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polling server every 64 s
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```
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### 方法 3：如何使用 timedatectl 命令检查 NTP 状态？
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[timedatectl 命令][3]用于查询和更改系统时钟及其在 systmed 系统中的设置。
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```
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# timedatectl
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或
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# timedatectl status
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Local time: Thu 2019-05-30 05:01:05 CDT
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Universal time: Thu 2019-05-30 10:01:05 UTC
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RTC time: Thu 2019-05-30 10:01:05
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Time zone: America/Chicago (CDT, -0500)
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NTP enabled: yes
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NTP synchronized: yes
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RTC in local TZ: no
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DST active: yes
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Last DST change: DST began at
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Sun 2019-03-10 01:59:59 CST
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Sun 2019-03-10 03:00:00 CDT
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Next DST change: DST ends (the clock jumps one hour backwards) at
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Sun 2019-11-03 01:59:59 CDT
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Sun 2019-11-03 01:00:00 CST
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```
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### 更多技巧
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Chrony 是一个 NTP 客户端的替代品。它可以更快地同步系统时钟，时间精度更高，对于一直不在线的系统尤其有用。
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chronyd 较小，它使用较少的内存，只在必要时才唤醒 CPU，这样可以更好地节省电能。即使网络拥塞较长时间，它也能很好地运行。
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你可以使用以下任何命令来检查 Chrony 状态。
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检查 Chrony 跟踪状态。
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```
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# chronyc tracking
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Reference ID : C0A80105 (CentOS7.2daygeek.com)
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Stratum : 3
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Ref time (UTC) : Thu Mar 28 05:57:27 2019
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System time : 0.000002545 seconds slow of NTP time
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Last offset : +0.001194361 seconds
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RMS offset : 0.001194361 seconds
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Frequency : 1.650 ppm fast
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Residual freq : +184.101 ppm
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Skew : 2.962 ppm
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Root delay : 0.107966967 seconds
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Root dispersion : 1.060455322 seconds
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Update interval : 2.0 seconds
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Leap status : Normal
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```
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运行 `sources` 命令以显示有关当前时间源的信息。
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```
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# chronyc sources
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210 Number of sources = 1
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MS Name/IP address Stratum Poll Reach LastRx Last sample
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===============================================================================
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^* CentOS7.2daygeek.com 2 6 17 62 +36us[+1230us] +/- 1111ms
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```
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--------------------------------------------------------------------------------
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via: https://www.2daygeek.com/check-verify-ntp-sync-is-working-or-not-in-linux-using-ntpq-ntpstat-timedatectl/
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作者：[Magesh Maruthamuthu][a]
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选题：[lujun9972][b]
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译者：[wxy](https://github.com/wxy)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://www.2daygeek.com/author/magesh/
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[b]: https://github.com/lujun9972
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[1]: https://linux.cn/article-10811-1.html
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[2]: https://linux.cn/article-10820-1.html
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[3]: https://www.2daygeek.com/change-set-time-date-and-timezone-on-linux/
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