NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ\�ｿｽz(chrony)

�ｿｽﾅ終�ｿｽX�ｿｽV�ｿｽ�ｿｽ�ｿｽF 2022.10.16

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NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽ�ｿｽ\�ｿｽz�ｿｽ�ｿｽ�ｿｽﾄ、�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽﾌシ�ｿｽX�ｿｽe�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ{�ｿｽW�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾉ趣ｿｽ�ｿｽ�ｿｽ�ｿｽI�ｿｽﾉ搾ｿｽ�ｿｽ墲ｹ�ｿｽ�ｿｽB

�ｿｽ�ｿｽCentOS7�ｿｽ�ｿｽ�ｿｽW�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽchrony�ｿｽﾖ切ゑｿｽﾖゑｿｽ�ｿｽ�ｿｽ黷ｽ


�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽC�ｿｽ�ｿｽ�ｿｽX�ｿｽg�ｿｽ[�ｿｽ�ｿｽ

[root@centos ~]# yum -y install chrony�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽC�ｿｽ�ｿｽ�ｿｽX�ｿｽg�ｿｽ[�ｿｽ�ｿｽ

�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽﾝ抵ｿｽ

[root@centos ~]# vi /etc/chrony.conf�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@ntp�ｿｽﾝ抵ｿｽt�ｿｽ@�ｿｽC�ｿｽ�ｿｽ�ｿｽﾒ集
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
�ｿｽ�ｿｽ�ｿｽ@�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽﾏ更
# �ｿｽ�ｿｽ�ｿｽ{�ｿｽW�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ氓�ｿｽ�ｿｽﾄゑｿｽ�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[(stratum 1)
server ntp.nict.jp iburst
# �ｿｽ�ｿｽL�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽﾆ抵ｿｽ�ｿｽﾚ難ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾄゑｿｽ�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[(stratum 2)
server ntp.jst.mfeed.ad.jp iburst


# Allow NTP client access from local network.
#allow 192.168.0.0/16
allow 192.168.1.0/24�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽi�ｿｽ�ｿｽ:192.168.1.0/24�ｿｽj�ｿｽ�ｿｽ�ｿｽ�ｿｽﾌ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ

�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽN�ｿｽ�ｿｽ

NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽN�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾉ大幅�ｿｽﾉ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾄゑｿｽ�ｿｽ�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽ�ｿｽN�ｿｽ�ｿｽ�ｿｽﾅゑｿｽ�ｿｽﾈゑｿｽ�ｿｽﾌで、�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽA�ｿｽ闢ｮ�ｿｽﾅ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ墲ｹ�ｿｽ�ｿｽ
[root@centos ~]# chronyc makestep�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@�ｿｽ闢ｮ�ｿｽﾅ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ墲ｹ�ｿｽ�ｿｽ

[root@centos ~]# systemctl restart chronyd�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽﾄ起�ｿｽ�ｿｽ

[root@centos ~]# systemctl enable chronyd�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽN�ｿｽ�ｿｽ�ｿｽﾝ抵ｿｽ


�ｿｽ�ｿｽNTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽm�ｿｽF

[root@centos ~]# chronyc sources�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽﾖの趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾔ確�ｿｽF
210 Number of sources = 3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp-a3.nict.go.jp             1   6    17    26    -38us[ -112us] +/- 4315us
^- ntp3.jst.mfeed.ad.jp          2   6    17    26   -369us[ -369us] +/-   12ms
�ｿｽ@�ｿｽ�ｿｽ�ｿｽ@NTP�ｿｽT�ｿｽ[�ｿｽo�ｿｽ[�ｿｽ�ｿｽ�ｿｽﾌ前�ｿｽ�ｿｽ*�ｿｽﾜゑｿｽ�ｿｽ�ｿｽ+�ｿｽ�ｿｽ�ｿｽ\�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾎ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽﾌ擾ｿｽ�ｿｽ(chronyd�ｿｽﾌ擾ｿｽﾔ確�ｿｽF)

�ｿｽ�ｿｽ�ｿｽN�ｿｽ�ｿｽ�ｿｽC�ｿｽA�ｿｽ�ｿｽ�ｿｽg�ｿｽﾌ趣ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ�ｿｽ

�ｿｽC�ｿｽ�ｿｽ�ｿｽ^�ｿｽ[�ｿｽl�ｿｽb�ｿｽg�ｿｽﾅ趣ｿｽ�ｿｽv�ｿｽ�ｿｽ�ｿｽ墲ｹ�ｿｽ�ｿｽ�ｿｽQ�ｿｽ�ｿｽ


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