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：
disabled
disabled表示没有开机启动
% q3 W  W) n! U3 J* e% o( @$ ~[root@controller ~]# systemctl enable chronyd.service       设置开机启动
Created symlink /etc/systemd/system/multi-user.target.wants/chronyd.service → /usr/lib/systemd/system/chronyd.service.
[root@controller ~]#
# m, O5 x  p4 w+ B$ t再次检查是否正常。
[root@controller ~]# systemctl is-enabled chronyd.service  
enabled
; v+ r  z0 W! }" G: n+ w[root@controller ~]#

) J9 C; o9 ?# P: t立即手工同步
+ x0 E7 O* x" c- C2 ^' c$ v[root@controller ~]# chronyc -a makestep
200 OK


9 x( p* [9 N. F) x6 K' U' e( M校准时间服务器：
3 p# y, N7 S$ ^' x+ U; Y[root@controller ~]# chronyc tracking
, X. M4 ~- ^( N8 g+ lReference ID    : 7F7F0101 ()
) X9 m4 g4 i9 i" V# ^6 N2 hStratum         : 10
; A# f! V7 E. [" [Ref time (UTC)  : Tue Sep 07 06:18:45 2021
System time     : 0.000000001 seconds fast of NTP time
. V% `; i1 T/ J! p, \5 m: NLast offset     : +0.946435213 seconds
RMS offset      : 0.946435213 seconds
& z$ E' ?7 H' p, c. ZFrequency       : 0.694 ppm fast
Residual freq   : +0.000 ppm
. A' B3 N' _" V" ]0 S4 w) QSkew            : 0.000 ppm
Root delay      : 0.000000000 seconds
, `% w, R' b) v% f4 U# B' [% Q. hRoot dispersion : 0.000000000 seconds
Update interval : 0.0 seconds
Leap status     : Normal
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admin

[root@compute01 ~]# timedatectl show
% ^7 |% W1 _1 j2 b( f/ _7 {Timezone=Asia/Shanghai
& w: n$ |' t: h/ t6 BLocalRTC=no
CanNTP=yes
7 ~/ E* M6 W0 rNTP=yes
8 f; b6 _/ K4 ~$ XNTPSynchronized=no
+ s+ H) G5 {; j, `  M+ qTimeUSec=Sat 2021-09-04 11:38:37 CST
RTCTimeUSec=Sat 2021-09-04 11:38:37 CST
2 x& v& {) [9 W1 p[root@compute01 ~]# timedatectl
) c9 q" p! M: @. X3 ?               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)
. X' @0 }+ E) u8 I0 I) uSystem clock synchronized: no
7 o0 J  J, B( x# I( s              NTP service: active
          RTC in local TZ: no

admin

# chronyc sources
( l2 y$ e$ z. @- `9 D* v' G+ _( L210 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：
+ n# t( Z) ~7 H% `
[root@ceph1 ~]# systemctl stop chronyd.service
[root@ceph1 ~]# chronyd -q 'server ntp.ntsc.ac.cn iburst'
* N0 T3 n; U7 f! `' |" {; t4 {2021-09-08T03:30:43Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
% |0 w% A- h3 W$ _2021-09-08T03:30:43Z Initial frequency -0.504 ppm
8 T1 F# E1 l5 K: z! `  `: ~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'
) n5 o; R4 X3 |2 `  M2021-09-08T03:30:57Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
2021-09-08T03:30:57Z Initial frequency -0.504 ppm
2021-09-08T03:31:08Z No suitable source for synchronisation
2021-09-08T03:31:08Z chronyd exiting
[root@ceph1 ~]# chronyd -q 'server ceph2 iburst'
  {0 I, N, w/ s& T) `) ?2 G2021-09-08T03:31:21Z chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
3 G2 q0 I3 R6 o3 e3 X' ?2021-09-08T03:31:21Z Initial frequency -0.504 ppm
$ C" j" A0 Q8 n5 O- c! b) x2021-09-08T03:31:25Z System clock wrong by -0.115654 seconds (step)
3 P. C1 h/ U. ^, D2 w2021-09-08T03:31:25Z chronyd exiting