我们正在使用 chrony 服务将 Linux 客户端同步到集群中的 NTP 服务器
由于我们得到了机器之间的时间差异，我们启用了 chrony 日志来了解集群中机器时间差异的原因
chrony 日志示例
[root@server_2 chrony]# ls
tracking.log
statistics.log
measurements.log
[root@server_2 chrony]#
more tracking.log
==================================================================================================
Date (UTC) Time IP Address St Freq ppm Skew ppm Offset L Co Offset sd Rem. corr.
==================================================================================================
2019-11-02 16:28:29 193.34.2.90 7 3.319 0.413 -3.194e-05 N 1 7.595e-06 -2.451e-08
2019-11-02 16:29:33 193.34.2.90 7 3.280 0.241 -4.739e-06 N 1 7.793e-06 -8.506e-09
2019-11-02 16:30:38 193.34.2.90 7 3.280 0.162 9.378e-07 N 1 7.708e-06 2.806e-06
2019-11-02 16:31:42 193.34.2.90 7 3.279 0.194 -8.777e-05 N 1 2.454e-05 1.565e-06
2019-11-02 16:32:47 193.34.2.90 7 3.276 0.265 -6.126e-05 N 1 1.462e-05 -5.085e-08
2019-11-02 16:33:52 193.34.2.90 7 3.205 0.589 -4.021e-05 N 1 1.390e-05 -6.203e-08
2019-11-02 16:34:56 193.34.2.90 7 2.670 0.777 -4.523e-05 N 1 9.487e-06 -2.635e-09
2019-11-02 16:38:10 193.34.2.90 7 2.547 0.381 -2.507e-05 N 1 1.595e-05 -3.263e-08
2019-11-02 16:39:14 193.34.2.90 7 2.369 0.398 -8.562e-05 N 1 1.637e-05 1.624e-05
2019-11-02 16:40:20 193.34.2.90 7 2.323 0.264 -8.542e-06 N 1 1.498e-05 -9.931e-08
2019-11-02 16:41:25 193.34.2.90 7 2.331 0.240 7.737e-06 N 1 1.872e-05 5.261e-06
2019-11-02 16:42:30 193.34.2.90 7 2.338 0.211 3.433e-06 N 1 1.958e-05 -2.259e-06
2019-11-02 16:44:40 193.34.2.90 7 2.309 0.395 -1.485e-04 N 1 4.641e-05 -3.489e-06
2019-11-02 16:45:44 193.34.2.90 7 2.200 0.760 3.455e-07 N 1 4.970e-05 -1.446e-07
2019-11-02 16:46:50 193.34.2.90 7 2.193 0.951 -3.363e-04 N 1 8.643e-05 -4.877e-07
2019-11-02 16:47:54 193.34.2.90 7 2.183 1.243 -4.516e-04 N 1 1.033e-04 -2.225e-07
2019-11-02 16:48:59 193.34.2.90 7 -0.736 5.314 -5.285e-04 N 1 6.903e-06 -3.506e-07
2019-11-02 16:50:04 193.34.2.90 7 -4.855 0.933 -2.600e-04 N 1 5.356e-06 -5.370e-07
..
more measurements.log
========================================================================================================================
Date (UTC) Time IP Address L St 123 567 ABCD LP RP Score Offset Peer del. Peer disp. Root del. Root disp.
========================================================================================================================
2019-11-02 16:41:25 193.34.2.90 N 6 111 111 1111 6 6 0.48 -1.000e-04 5.220e-04 1.477e-06 5.206e-01 6.248e-01
2019-11-02 16:42:30 193.34.2.90 N 6 111 111 1111 6 6 0.62 -1.400e-05 4.490e-04 1.477e-06 5.206e-01 6.258e-01
2019-11-02 16:43:35 193.34.2.90 N 6 111 111 1101 6 6 0.72 7.440e-04 1.466e-03 1.477e-06 5.206e-01 6.268e-01
2019-11-02 16:44:40 193.34.2.90 N 6 111 111 1111 6 6 0.00 1.770e-04 2.860e-04 1.477e-06 5.206e-01 6.278e-01
2019-11-02 16:45:44 193.34.2.90 N 6 111 111 1111 6 6 0.03 -7.100e-05 5.100e-04 1.478e-06 5.206e-01 6.287e-01
2019-11-02 16:46:50 193.34.2.90 N 6 111 111 1111 6 6 0.00 3.820e-04 2.460e-04 1.477e-06 5.206e-01 6.174e-01
2019-11-02 16:47:54 193.34.2.90 N 6 111 111 1111 6 6 0.00 5.190e-04 2.260e-04 1.484e-06 5.206e-01 6.183e-01
2019-11-02 16:48:59 193.34.2.90 N 6 111 111 1111 6 6 0.00 5.240e-04 2.450e-04 1.488e-06 5.206e-01 6.193e-01
关于上述日志
日志中表明问题的重要值是什么？
如何知道 Crhony 服务同步是否符合标准？
chronyc -n sources
210 Number of sources = 1
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 193.34.2.90 6 8 377 97 +20us[ +27us] +/- 1079ms
[root@master02 ~]# chronyc -n tracking
Reference ID : 193.34.2.90 (193.34.2.90)
Stratum : 7
Ref time (UTC) : Sat Nov 2 21:26:29 2019
System time : 6144.669921875 seconds fast of NTP time
Last offset : +0.000007461 seconds
RMS offset : 15.415832520 seconds
Frequency : 32.717 ppm slow
Residual freq : +0.002 ppm
Skew : 0.029 ppm
Root delay : 0.521056 seconds
Root dispersion : 0.796153 seconds
Update interval : 141.3 seconds
Leap status : Normal