Chrony のインストールと設定

[root@falcon21 ~]# dnf -y install chrony
メタデータの期限切れの最終確認: 6:19:33 時間前の 2020年11月18日 06時16分10秒 に実施しました。
パッケージ chrony-3.5-1.el8.x86_64 はすでにインストールされています。
依存関係が解決しました。
行うべきことはありません。
完了しました!


[root@falcon21 ~]# vi /etc/chrony.conf
1 # Use public servers from the pool.ntp.org project.
2 # Please consider joining the pool (http://www.pool.ntp.org/join.html).
3 #pool 2.centos.pool.ntp.org iburst
4 pool ntp.nict.jp iburst
5
6 # Record the rate at which the system clock gains/losses time.
7 driftfile /var/lib/chrony/drift
8
9 # Allow the system clock to be stepped in the first three updates
10 # if its offset is larger than 1 second.
11 makestep 1.0 3
12
13 # Enable kernel synchronization of the real-time clock (RTC).
14 rtcsync
15
16 # Enable hardware timestamping on all interfaces that support it.
17 #hwtimestamp *
18
19 # Increase the minimum number of selectable sources required to adjust
20 # the system clock.
21 #minsources 2
22
23 # Allow NTP client access from local network.
24 #allow 192.168.0.0/16
25 allow 192.168.10.0/24
26
27 # Serve time even if not synchronized to a time source.
28 #local stratum 10
29
30 # Specify file containing keys for NTP authentication.
31 keyfile /etc/chrony.keys
32
33 # Get TAI-UTC offset and leap seconds from the system tz database.
34 leapsectz right/UTC
35
36 # Specify directory for log files.
37 logdir /var/log/chrony
38
39 # Select which information is logged.
40 #log measurements statistics tracking

NTP chronyd 起動

[root@falcon21 ~]# systemctl start chronyd

[root@falcon21 ~]# systemctl enable chronyd

[root@falcon21 ~]# systemctl restart chronyd

 

[root@falcon21 ~]# systemctl status chronyd

● chronyd.service - NTP client/server

   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2020-11-17 17:00:42 JST; 1 day 2h ago
     Docs: man:chronyd(8)
           man:chrony.conf(5)
 Main PID: 869 (chronyd)
    Tasks: 1 (limit: 48971)
   Memory: 2.5M
   CGroup: /system.slice/chronyd.service
           └─869 /usr/sbin/chronyd
 
11月 17 17:00:37 falcon21.space systemd[1]: Starting NTP client/server...
11月 17 17:00:38 falcon21.space chronyd[869]: chronyd version 3.5 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +S>
11月 17 17:00:38 falcon21.space chronyd[869]: Frequency 4.607 +/- 0.244 ppm read from /var/lib/chrony/drift
11月 17 17:00:39 falcon21.space chronyd[869]: Using right/UTC timezone to obtain leap second data
11月 17 17:00:42 falcon21.space systemd[1]: Started NTP client/server.
11月 17 17:01:48 falcon21.space chronyd[869]: Selected source 2001:418:3ff::53
11月 17 17:01:48 falcon21.space chronyd[869]: System clock TAI offset set to 37 seconds
11月 17 17:01:49 falcon21.space chronyd[869]: Selected source 2400:8500:1801:418:a118:27:37:521
lines 1-19/19 (END)
 
 


動作確認
[root@falcon21 ~]# chronyc sources
210 Number of sources = 4
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* 2400:8500:1801:418:a118:> 2 10 377 132 -1052us[-1626us] +/- 11ms
^- 2409:10:2540:300:f64d:30> 2 10 377 450 -1048us[-1553us] +/- 55ms
^- 2606:4700:f1::123 3 10 377 547 +3877us[+3392us] +/- 62ms
^- 2001:418:3ff::53 2 10 377 532 +726us[ +238us] +/- 73ms

 

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