Ubuntu 14.04
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Configure NTP Server (Chrony)
2014/04/18
  Install Chrony and Configure NTP server for time adjustment. NTP uses 123/UDP.
root@dlp:~#
apt-get -y install chrony
root@dlp:~#
vi /etc/chrony/chrony.conf
# line 20: comment out

#
server 0.debian.pool.ntp.org offline minpoll 8
#
server 1.debian.pool.ntp.org offline minpoll 8
#
server 2.debian.pool.ntp.org offline minpoll 8
#
server 3.debian.pool.ntp.org offline minpoll 8
# add servers of your timezone for time synchronization

server ntp1.jst.mfeed.ad.jp offline minpoll 8
server ntp2.jst.mfeed.ad.jp offline minpoll 8
server ntp3.jst.mfeed.ad.jp offline minpoll 8
# line 69: add the network range you allow to receive requests

#
allow 10/8
#
allow 192.168/16
#
allow 172.16/12
allow 10.0.0.0/24
root@dlp:~#
/etc/init.d/chrony restart

Restarting time daemon: Starting /usr/sbin/chronyd...
chronyd is running and online.

# show status

root@dlp:~#
chronyc sources

210 Number of sources = 3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp1.jst.mfeed.ad.jp          2   8    37    19   +504us[ +561us] +/-   81ms
^+ ntp2.jst.mfeed.ad.jp          2   8    37    20   -855us[ -798us] +/-   85ms
^+ ntp3.jst.mfeed.ad.jp          2   8    37    20   +633us[ +947us] +/-  112ms
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