Debian 9 Stretch
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Configure NTP Server(Chrony)
2017/06/18
 
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 3: comment out

#
pool 2.debian.pool.ntp.org iburst
# add servers in your timezone to sync times

server ntp.nict.jp iburst
server ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst
# add to the end : add the network range you allow to receive requests

allow 10.0.0.0/24
root@dlp:~#
systemctl restart chrony
# show status

root@dlp:~#
chronyc sources 

210 Number of sources = 3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp-a2.nict.go.jp             1   6     7     1   +508us[ +446us] +/- 9385us
^- ntp1.jst.mfeed.ad.jp          2   6     7     1  -1555us[-1617us] +/-   82ms
^- ntp2.jst.mfeed.ad.jp          2   6     7     1  -1476us[-1538us] +/-  101ms
 
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