CentOS Stream 9
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NTP : Configure NTP Server2022/01/07

 
Install Chrony to Configure NTP Server for Time Synchronization.
[1] Install and Configure Chrony.
[root@dlp ~]#
dnf -y install chrony
[root@dlp ~]#
vi /etc/chrony.conf
# line 3 : change servers to synchronize (replace to your own timezone NTP server)
# need NTP server itself to sync time with other NTP server

#
pool 2.centos.pool.ntp.org iburst
pool ntp.nict.jp iburst
# line 27 : add network range to allow to receive time synchronization requests from NTP Clients
# specify your local network and so on
# if not specified, only localhost is allowed

allow 10.0.0.0/24
[root@dlp ~]#
systemctl enable --now chronyd

[2] If Firewalld is running, allow NTP service. NTP uses [123/UDP].
[root@dlp ~]#
firewall-cmd --add-service=ntp

success
[root@dlp ~]#
firewall-cmd --runtime-to-permanent

success
[3] Verify it works normally.
[root@dlp ~]#
chronyc sources

MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp-b3.nict.go.jp             1   6    17    33   -794us[ -129us] +/- 9285us
^+ ntp-a3.nict.go.jp             1   6    17    34   +851us[+1515us] +/- 8783us
^- ntp-b2.nict.go.jp             1   6    17    34   -736us[ -736us] +/- 9296us
^* ntp-a2.nict.go.jp             1   6    17    34  -4982ns[ +659us] +/- 9399us
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