Ubuntu 18.04
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NTP Server : Configure NTPd
2018/04/27
 
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
server ntp.nict.jp iburst
server ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst 

# line 53: 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
# show status

root@dlp:~#
ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp-a3.nict.go. .NICT.           1 u    1   64    1   29.497   12.191   0.000
 ntp1.jst.mfeed. 133.243.236.17   2 u    2   64    1   19.361   13.572   0.000
 ntp2.jst.mfeed. 133.243.236.17   2 u    2   64    1   19.172   13.462   0.201
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