CentOS 7
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Chrony : Configure NTP Server
2015/06/03
 
Install Chrony and Configure NTP server for time adjustment.
[1] Install Chrony.
[root@dlp ~]#
yum -y install chrony
[root@dlp ~]#
vi /etc/chrony.conf
# line 3: change servers for synchronization

#
server 0.centos.pool.ntp.org iburst
#
server 1.centos.pool.ntp.org iburst
#
server 2.centos.pool.ntp.org iburst
#
server 3.centos.pool.ntp.org iburst
server ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst
server ntp3.jst.mfeed.ad.jp iburst
# line 25: add the network range you allow to receive requests

allow 10.0.0.0/24
[root@dlp ~]#
systemctl start chronyd

[root@dlp ~]#
systemctl enable chronyd

[2] If Firewalld is running, allow NTP service. NTP uses 123/UDP.
[root@dlp ~]#
firewall-cmd --add-service=ntp --permanent

success
[root@dlp ~]#
firewall-cmd --reload

success
[3] Verify it works normally like follows.
[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   6    17     8  -1028us[-1261us] +/-   14ms
^* ntp2.jst.mfeed.ad.jp          2   6    17     8  -1241us[-1474us] +/-   15ms
^? ntp3.jst.mfeed.ad.jp          0   6     0   10y     +0ns[   +0ns] +/-    0ns
 
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