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：
  J( X5 \3 P" c% H7 I' Ldisabled
% L$ w) h9 b" v+ Udisabled表示没有开机启动
2 [1 T0 h! ]. n" l, g[root@controller ~]# systemctl enable chronyd.service       设置开机启动
9 {6 r1 f; q% E- a) h8 pCreated symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.
4 [6 E' b0 |* E1 O" K[root@controller ~]#
/ c5 ?3 p' @4 w* i2 f* X2 k3 i再次检查是否正常。
1 A- y8 n' w, l  D. |  m0 Y[root@controller ~]# systemctl is-enabled chronyd.service  
enabled
( n, {: ]8 l+ E3 r/ m+ C1 e; e[root@controller ~]#
- p" P9 w* n' f0 Z9 l. l/ G
. ^6 J) u6 E5 ^3 V* S2 T, {立即手工同步
[root@controller ~]# chronyc -a makestep
  b& p4 b6 ]( H6 G! W1 y5 o5 s200 OK


校准时间服务器：
* u  m1 j( w1 n: x[root@controller ~]# chronyc tracking
Reference ID    : 7F7F0101 ()
Stratum         : 10
) |* j( b2 W9 r3 Y8 N" g6 gRef time (UTC)  : Tue Sep 07 06:18:45 2021
System time     : 0.000000001 seconds fast of NTP time
: W$ h7 R4 J/ i$ ]1 Q+ FLast offset     : +0.946435213 seconds
% o0 S* ^4 p7 [- d; mRMS offset      : 0.946435213 seconds
  H' P- d; ~" u4 L+ `3 fFrequency       : 0.694 ppm fast
" A. G/ b" ^5 N5 [# w; YResidual freq   : +0.000 ppm
Skew            : 0.000 ppm
Root delay      : 0.000000000 seconds
$ E/ k& c: }7 z6 H3 CRoot dispersion : 0.000000000 seconds
Update interval : 0.0 seconds
3 i, L6 `1 U5 {Leap status     : Normal
7 H) @! o  U/ w& Y1 ^$ D
- K5 V0 O9 ?2 F3 e

admin

[root@compute01 ~]# timedatectl show
Timezone=Asia/Shanghai
% J# t. @5 T7 y3 W1 a6 oLocalRTC=no
4 ^, \- z3 V( zCanNTP=yes
NTP=yes
NTPSynchronized=no
TimeUSec=Sat 2021-09-04 11:38:37 CST
RTCTimeUSec=Sat 2021-09-04 11:38:37 CST
  ~. S9 o8 v5 M( Q[root@compute01 ~]# timedatectl
               Local time: Sat 2021-09-04 11:39:11 CST
% t' V" p. q3 L: M( H           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)
7 b# G0 d6 _- l; X1 aSystem clock synchronized: no
              NTP service: active
          RTC in local TZ: no

admin

# chronyc sources
+ t" t# A3 D, B# r8 `- ~( Q4 _210 Number of sources = 2
$ S- [  m9 _+ R4 ^- A7 J' V8 ^MS Name/IP address         Stratum Poll Reach LastRx Last sample               
0 d5 u7 }! v1 J& z===============================================================================
^x ceph1                        10  10   377   610   -415us[ -415us] +/-  382us
9 C8 Y( s+ M% V; R^x ceph2                        10  10   377    75   -928ms[ -928ms] +/-   86us

admin

临时同步时间：

[root@ceph1 ~]# systemctl stop chronyd.service
[root@ceph1 ~]# chronyd -q 'server ntp.ntsc.ac.cn iburst'
2021-09-08T03:30:43Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
/ ~2 t( o- H% _- U! m# f/ |- y2021-09-08T03:30:43Z 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)
7 r% m  g  e0 W- i& X# V) t5 v4 A2021-09-08T03:30:57Z Initial frequency -0.504 ppm
' H/ ~! c% w+ \. I& y2021-09-08T03:31:08Z No suitable source for synchronisation
- T) `9 o! K& `2021-09-08T03:31:08Z chronyd exiting
[root@ceph1 ~]# chronyd -q 'server ceph2 iburst'
2021-09-08T03:31:21Z 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
( T# p1 d/ @+ H% U# s2021-09-08T03:31:25Z System clock wrong by -0.115654 seconds (step)
2021-09-08T03:31:25Z chronyd exiting