NTP Server : Configure NTP Server (Chrony)2021/04/28

	Install Chrony and Configure NTP server for time adjustment. NTP uses 123/UDP.
[1]	Install and Configure Chrony.

root@dlp:~#

apt -y install chrony

root@dlp:~#

vi /etc/chrony/chrony.conf

# line 20 : comment out default settings and add NTP Servers for your timezone

#pool ntp.ubuntu.com        iburst maxsources 4
#pool 0.ubuntu.pool.ntp.org iburst maxsources 1
#pool 1.ubuntu.pool.ntp.org iburst maxsources 1
#pool 2.ubuntu.pool.ntp.org iburst maxsources 2
pool ntp.nict.jp iburst

# add to the end : add network range you allow to receive time syncing requests from clients

allow 10.0.0.0/24

root@dlp:~#

systemctl restart chrony

# verify status

root@dlp:~#

chronyc sources

MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp-b2.nict.go.jp             1   6     7     1   -161us[-5285us] +/- 9902us
^- ntp-k1.nict.jp                1   6     7     1  -1709us[-6833us] +/- 8891us
^+ ntp-a3.nict.go.jp             1   6     7     1  +1226us[-3898us] +/- 9469us
^* ntp-b3.nict.go.jp             1   6     7     1   -796us[-5919us] +/- 9542us

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