Ubuntu 21.04
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NTP Server : Configure NTP Server (NTPd)2021/04/28

 
Install NTPd and Configure NTP server for time adjustment. NTP uses 123/UDP.
[1] Install and Configure NTPd.
root@dlp:~#
apt -y install ntp
root@dlp:~#
vi /etc/ntp.conf
# line 21 : comment out default settings and add NTP Servers for your timezone

#pool 0.ubuntu.pool.ntp.org iburst
#pool 1.ubuntu.pool.ntp.org iburst
#pool 2.ubuntu.pool.ntp.org iburst
#pool 3.ubuntu.pool.ntp.org iburst

# Use Ubuntu's ntp server as a fallback.
#pool ntp.ubuntu.com
pool ntp.nict.jp iburst 

# line 51 : add network range you allow to receive time syncing requests from clients

restrict 10.0.0.0 mask 255.255.255.0 nomodify notrap
root@dlp:~#
systemctl restart ntp
# verify status

root@dlp:~#
ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp.nict.jp     .POOL.          16 p    -   64    0    0.000    0.000   0.000
*ntp-a2.nict.go. .NICT.           1 u    1   64    1   16.451    9.477   2.297
 ntp-k1.nict.jp  .nict.           1 u    2   64    1   45.758   -4.292  15.466
 ntp-a3.nict.go. .NICT.           1 u    1   64    1   15.337    9.015   7.940
 ntp-b3.nict.go. .NICT.           1 u    2   64    1   18.603   10.439   0.523
 ntp-b2.nict.go. .NICT.           1 u    2   64    1   18.996   10.804   1.200
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