centos8 chrony服务是否开机启动,同步时间，校准时间服务器

admin

[root@controller ~]# systemctl is-enabled chronyd.service       检查是否开机启动：
. n5 Z, s7 M& y# t; A5 Tdisabled
disabled表示没有开机启动
  ^. {' h- Y% D[root@controller ~]# systemctl enable chronyd.service       设置开机启动
" V  A, h, }! B; ^9 M: LCreated symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.
* ^  z7 w- P! K  ~[root@controller ~]#
/ ~1 }0 N" E# F9 S; W8 Z再次检查是否正常。
[root@controller ~]# systemctl is-enabled chronyd.service  
' Y( q# S& T# v6 Q1 p% `* w) tenabled
[root@controller ~]#
. w3 ^& s0 S5 x: ~2 J
立即手工同步
[root@controller ~]# chronyc -a makestep
; G- a2 W# @0 f. `200 OK
, W1 T- z: ^7 h1 W4 y
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校准时间服务器：
[root@controller ~]# chronyc tracking
Reference ID    : 7F7F0101 ()
Stratum         : 10
8 b" D0 Y5 d' h: w9 B# V9 QRef time (UTC)  : Tue Sep 07 06:18:45 2021
. l  N, P9 ]+ {$ q' bSystem time     : 0.000000001 seconds fast of NTP time
  S  @6 d" n  M' E; _5 X" Y) oLast offset     : +0.946435213 seconds
: `. L; D) I- gRMS offset      : 0.946435213 seconds
" y' b5 O8 G. j( sFrequency       : 0.694 ppm fast
* d+ D7 n+ a+ G! t3 vResidual freq   : +0.000 ppm
$ ]1 z5 W5 q* ~8 ~Skew            : 0.000 ppm
Root delay      : 0.000000000 seconds
- G# J4 ^' e9 D  S1 Q0 _! j' D, JRoot dispersion : 0.000000000 seconds
Update interval : 0.0 seconds
Leap status     : Normal
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admin

[root@compute01 ~]# timedatectl show
9 V- X* k& O4 aTimezone=Asia/Shanghai
8 N( ]2 o; I( T7 CLocalRTC=no
CanNTP=yes
NTP=yes
) W/ Y1 _# j0 D, C( DNTPSynchronized=no
TimeUSec=Sat 2021-09-04 11:38:37 CST
7 m9 Q/ g$ f/ \1 n+ |9 Z' C6 ]  KRTCTimeUSec=Sat 2021-09-04 11:38:37 CST
2 m. e  b. A% e7 m% v  y" }6 q2 E[root@compute01 ~]# timedatectl
               Local time: Sat 2021-09-04 11:39:11 CST
           Universal time: Sat 2021-09-04 03:39:11 UTC
                 RTC time: Sat 2021-09-04 03:39:11
                Time zone: Asia/Shanghai (CST, +0800)
  R, L2 D" b0 a' N/ Y# S8 S0 [, eSystem clock synchronized: no
6 s) n; a7 V3 H% r) x' y2 y              NTP service: active
          RTC in local TZ: no

admin

# chronyc sources
210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample               
===============================================================================
^x ceph1                        10  10   377   610   -415us[ -415us] +/-  382us
^x ceph2                        10  10   377    75   -928ms[ -928ms] +/-   86us

admin

临时同步时间：

) _% |% n2 l. T[root@ceph1 ~]# systemctl stop chronyd.service
; q" |7 G- P- b5 Q0 C! U! }( l2 U[root@ceph1 ~]# chronyd -q 'server ntp.ntsc.ac.cn iburst'
, w+ k# [% z& t* {2 {2021-09-08T03:30:43Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
2021-09-08T03:30:43Z Initial frequency -0.504 ppm
2021-09-08T03:30:49Z System clock wrong by 0.088282 seconds (step)
2021-09-08T03:30:49Z chronyd exiting
[root@ceph1 ~]# chronyd -q 'server ceph1 iburst'
2021-09-08T03:30:57Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
5 P, o1 w( y% h) X1 g7 p2021-09-08T03:30:57Z Initial frequency -0.504 ppm
2021-09-08T03:31:08Z No suitable source for synchronisation
2021-09-08T03:31:08Z chronyd exiting
) v, z0 P' V$ y* `[root@ceph1 ~]# chronyd -q 'server ceph2 iburst'
9 A3 e& X6 F5 }5 P  W1 c2021-09-08T03:31:21Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
2021-09-08T03:31:21Z Initial frequency -0.504 ppm
2021-09-08T03:31:25Z System clock wrong by -0.115654 seconds (step)
: J% q6 U$ ^; r2021-09-08T03:31:25Z chronyd exiting