NTPd : Configure NTP Server

Install NTPd and Configure NTP server for time adjustment.
[1] Install NTPd.
[root@dlp ~]# yum -y install ntp
[root@dlp ~]# vi /etc/ntp.conf
# line 18: add the network range you allow to receive requests
restrict 10.0.0.0 mask 255.255.255.0 nomodify notrap
# 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
[root@dlp ~]# systemctl start ntpd
[root@dlp ~]# systemctl enable ntpd
[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 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
+ntp1.jst.mfeed. 172.29.1.100 2 u 29 64 1 18.826 -0.126 0.000
+ntp2.jst.mfeed. 172.29.2.50 2 u 28 64 1 21.592 0.018 0.000
*ntp3.jst.mfeed. 133.243.236.18 2 u 28 64 1 22.666 -1.033 0.000

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