NTP : Configure NTP Server2023/02/20

	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.almalinux.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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