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Chrony : Configure NTP Server
2016/07/28 |
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Install Chrony and Configure NTP server for time adjustment.
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| [1] | Install and Configure Chrony. |
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[root@dlp ~]#
yum -y install chrony
[root@dlp ~]#
vi /etc/chrony.conf # line 3: change servers for synchronization to your timezone # server 0.rhel.pool.ntp.org iburst# server 1.rhel.pool.ntp.org iburst# server 2.rhel.pool.ntp.org iburst# server 3.rhel.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
/etc/rc.d/init.d/chronyd start Starting ntpd: [ OK ] [root@dlp ~]# chkconfig chronyd on |
| [2] | If Iptables is running, allow NTP port. NTP uses 123/UDP. For "-I INPUT 5" section below, Replace it to your own environment. |
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[root@dlp ~]# iptables -I INPUT 5 -p udp -m state --state NEW -m udp --dport 123 -j ACCEPT |
| [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 37 48 +2180us[+2180us] +/- 80ms ^* ntp2.jst.mfeed.ad.jp 2 6 37 49 +3346us[+2944us] +/- 75ms ^- ntp3.jst.mfeed.ad.jp 2 6 37 48 +3914us[+3914us] +/- 155ms |