Chrony : Configure NTP Server2015/06/03 |
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Install Chrony and Configure NTP server for time adjustment.
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| [1] | Install Chrony. |
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[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
systemctl start chronyd [root@dlp ~]# systemctl enable chronyd |
| [2] | If Firewalld is running, allow NTP service. NTP uses 123/UDP. |
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[root@dlp ~]# firewall-cmd --add-service=ntp --permanent success [root@dlp ~]# firewall-cmd --reload success |
| [3] | Verify it works normally like follows. |
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[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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