chronyの確認コマンド

chrony

同期出来ているパターン†

$ chronyc tracking
Reference ID    : 210.173.160.27(ntp1.jst.mfeed.ad.jp)
Stratum         : 2
Ref time (UTC)  : Fri Jul  8 03:25:24 2016
System time     : 0.000037775 seconds fast of NTP time
Last offset     : +0.000094745 seconds
RMS offset      : 0.000035295 seconds
Frequency       : 0.008 ppm fast
Residual freq   : +0.012 ppm
Skew            : 0.012 ppm
Root delay      : 0.002210 seconds
Root dispersion : 0.000309 seconds
Update interval : 1024.2 seconds
Leap status     : Normal

$ chronyc sources
210 Number of sources = 4
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp1.jst.mfeed.ad.jp          2  10   377   784   -308us[ -213us] +/-   64ms
^- ntp2.jst.mfeed.ad.jp          2  10   377   556   -462us[ -462us] +/-   82ms
^- ntp3.jst.mfeed.ad.jp          2  10   377   292  -1293us[-1293us] +/-  122ms

同期できてないパターン†

$ chronyc tracking
Reference ID    : 0.0.0.0 ()
Stratum         : 0
Ref time (UTC)  : Thu Jan  1 00:00:00 1970
System time     : 0.000000064 seconds fast of NTP time
Last offset     : +0.000000000 seconds
RMS offset      : 0.000000000 seconds
Frequency       : 3.835 ppm fast
Residual freq   : +0.000 ppm
Skew            : 0.000 ppm
Root delay      : 0.000000 seconds
Root dispersion : 0.000000 seconds
Update interval : 0.0 seconds
Leap status     : Not synchronised

$ chronyc sources
210 Number of sources = 4
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^? ntp1.jst.mfeed.ad.jp          0  10     0   10y     +0ns[   +0ns] +/-    0ns
^? ntp2.jst.mfeed.ad.jp          0  10     0   10y     +0ns[   +0ns] +/-    0ns
^? ntp3.jst.mfeed.ad.jp          0  10     0   10y     +0ns[   +0ns] +/-    0ns

↑?だと同期ができていない

強制同期†

$ sudo chronyc -a makestep
200 OK
200 OK

ntpdateコマンドがある場合は、ntpdate NTPサーバーのアドレス でもOK