NTP : Configure NTP Server2021/02/22 |
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Install Chrony to Configure NTP Server for Time Synchronization.
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| [1] | Install and Configure Chrony. |
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[root@dlp ~]#
dnf -y install chrony
[root@dlp ~]#
vi /etc/chrony.conf # line 3: change servers to synchronize (replace to your own timezone NTP server) # need NTP server itself to sync time with other NTP server # pool 2.centos.pool.ntp.org iburst
pool ntp.nict.jp iburst
# line 24: add network range to allow to receive time synchronization requests from NTP Clients # specify your local network and so on # if not specified, only localhost is allowed
allow 10.0.0.0/24
systemctl enable --now 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. |
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[root@dlp ~]# chronyc sources 210 Number of sources = 4 MS Name/IP address Stratum Poll Reach LastRx Last sample =============================================================================== ^+ ntp-a3.nict.go.jp 1 9 377 291 +937us[ +937us] +/- 8281us ^* ntp-k1.nict.jp 1 9 377 295 -1925us[-2056us] +/- 8056us ^+ ntp-b2.nict.go.jp 1 9 377 286 -180ns[ -180ns] +/- 10ms ^+ ntp-b3.nict.go.jp 1 8 377 25 +478us[ +478us] +/- 9808us |