SLES 15
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Configure NTP Server
2019/01/14
 
Install Chrony and Configure NTP server for time adjustment.
[1] Install Chrony.
dlp:~ #
zypper -n install chrony
[2] Configure Chrony.
dlp:~ #
vi /etc/chrony.conf
# line 3: change servers for synchronization (replace to your timezone's one)

#
! pool 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
dlp:~ #
systemctl start chronyd

dlp:~ #
systemctl enable chronyd

[3] If Firewalld is running, allow NTP service. NTP uses 123/UDP.
dlp:~ #
firewall-cmd --add-service=ntp --permanent

success
dlp:~ #
firewall-cmd --reload

success
[4] Verify it works normally like follows.
dlp:~ #
chronyc sources

210 Number of sources = 2
MS Name/IP address         Stratum Poll Reach LastRx Last sample
===============================================================================
^* ntp-b3.nict.go.jp             1   6    17    11   -412us[-5299us] +/-   10ms
^- ntp1.jst.mfeed.ad.jp          2   6    17    12  +1433us[+1433us] +/-   87ms
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