NTP Server : Configure Chrony2019/05/06

	Install Chrony and Configure NTP server for time adjustment.
[1]	Install Chrony.

[root@dlp ~]#

dnf -y install chrony

[root@dlp ~]#

vi /etc/chrony.conf

# line 3: change servers for synchronization (replace to your timezone's one)

pool 2.fedora.pool.ntp.org iburst

server ntp.nict.jp iburst
server ntp1.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

[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 ~]#

chronyc sources

210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp-b2.nict.go.jp             1   6    17    11    -54us[ -832us] +/-   10ms
^- ntp1.jst.mfeed.ad.jp          2   6    17    12  -1647us[-2426us] +/-  102ms

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