Chrony : Configure NTP Server

Chrony : Configure NTP Server 2015/06/03

Install Chrony and Configure NTP server for time adjustment. NTP uses 123/UDP.

[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  [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