ヘルプ:NTPサーバー構築(chrony)(CentOS8)
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Chrony をインストールして、時刻同期サービスを提供する NTP サーバーを構築します。
chrony のインストール
[root@host4 ~]# dnf -y install chrony
chrony サーバー設定
[root@host4 ~]# vi /etc/chrony.conf # Use public servers from the pool.ntp.org project. #Please consider joining the pool (http://www.pool.ntp.org/join.html). # 同期をとるサーバーを変更 #pool 2.centos.pool.ntp.org iburst pool ntp.nict.jp iburst # Allow NTP client access from local network. # 内部からの時刻同期を許可 #allow 192.168.0.0/16 allow 192.168.1.0/24
chronyd の起動
[root@host4 ~]# systemctl enable --now chronyd
動作確認
[root@host4 ~]# systemctl status chronyd ● chronyd.service - NTP client/server Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor pre> Active: active (running) since Mon 2020-03-09 20:09:27 JST; 14h ago Docs: man:chronyd(8) man:chrony.conf(5) Main PID: 1373 (chronyd) Tasks: 1 (limit: 26213) Memory: 2.1M CGroup: /system.slice/chronyd.service mq1373 /usr/sbin/chronyd 3月 09 20:09:26 host3.sudachi.jp systemd[1]: Starting NTP client/server... 3月 09 20:09:26 host3.sudachi.jp chronyd[1373]: chronyd version 3.5 starting (+CMDMON +NTP +REFCLOC> 3月 09 20:09:26 host3.sudachi.jp chronyd[1373]: Using right/UTC timezone to obtain leap second data 3月 09 20:09:27 host3.sudachi.jp systemd[1]: Started NTP client/server. 3月 09 20:09:47 host3.sudachi.jp chronyd[1373]: Selected source 202.181.103.212 3月 09 20:09:47 host3.sudachi.jp chronyd[1373]: System clock TAI offset set to 37 seconds 3月 09 20:10:52 host3.sudachi.jp chronyd[1373]: Selected source 122.215.240.51 3月 10 01:43:21 host3.sudachi.jp chronyd[1373]: Selected source 202.181.103.212
時刻同期状態確認
[root@host4 ~]# chronyc sources -v 210 Number of sources = 4 .-- Source mode '^' = server, '=' = peer, '#' = local clock. / .- Source state '*' = current synced, '+' = combined , '-' = not combined, | / '?' = unreachable, 'x' = time may be in error, '~' = time too variable. || .- xxxx [ yyyy ] +/- zzzz || Reachability register (octal) -. | xxxx = adjusted offset, || Log2(Polling interval) --. | | yyyy = measured offset, || \ | | zzzz = estimated error. || | | \ MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^+ ntp-b2.nict.go.jp 1 6 377 6 -5220us[-5220us] +/- 10ms ^* ntp-b3.nict.go.jp 1 6 377 7 -3998us[-5985us] +/- 11ms ^+ ntp-a3.nict.go.jp 1 6 375 4 +7775us[+7775us] +/- 23ms ^+ ntp-a2.nict.go.jp 1 6 377 4 +7578us[+7578us] +/- 24ms
[root@host4 ~]# chronyc sources 210 Number of sources = 4 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^- ntp-b2.nict.go.jp 1 6 377 74 +3988us[+1936us] +/- 18ms ^- ntp-b3.nict.go.jp 1 6 377 9 +11ms[ +11ms] +/- 26ms ^- ntp-a3.nict.go.jp 1 6 357 7 +7422us[+7422us] +/- 22ms ^- ntp-a2.nict.go.jp 1 6 377 8 +12ms[ +12ms] +/- 26ms