NTP Server : Configure NTP Server2023/04/21

	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 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 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    17     7  -1503us[-1374us] +/-   11ms
^+ ntp-b3.nict.go.jp             1   6    17     8   -596us[ -467us] +/-   11ms
^+ ntp-a3.nict.go.jp             1   6    17     8   +384us[ +513us] +/- 9661us
^+ ntp-a2.nict.go.jp             1   6    17     8   +699us[ +827us] +/- 9174us

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