Chrony : Configure NTP Server2016/06/22

	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 ntp1.jst.mfeed.ad.jp iburst
server ntp2.jst.mfeed.ad.jp iburst
server ntp3.jst.mfeed.ad.jp iburst

# line 19: 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 = 3
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp1.jst.mfeed.ad.jp          2   6    37    20   +561us[ +530us] +/-   98ms
^* ntp2.jst.mfeed.ad.jp          2   6    37    20    -91us[ -122us] +/-   80ms
^+ ntp3.jst.mfeed.ad.jp          2   6    37    21   -567us[ -598us] +/-  127ms

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