Fedora 35
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NTP : Configure NTP Server
2021/11/04
 
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-a3.nict.go.jp             1   6    17     3   +171us[ +843us] +/- 8339us
^* ntp-a2.nict.go.jp             1   6    17     4   +304us[ +976us] +/- 8983us
^+ ntp-b3.nict.go.jp             1   6    17     4  -2654us[-1982us] +/-   11ms
^- ntp-b2.nict.go.jp             1   6    17     3  -1036us[-1036us] +/- 9465us
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