How to manually configure ntpd and chronyd on RHEL 6/7/8

                              by Jephe Wu   - http://linuxtechres.blogspot.com

Add below lines into /etc/chrony.conf or /etc/ntp.conf

server x.x.x.x iburst

server y.y.y.y iburst 

Manually update time once

systemctl stop ntpd

ntpdate x.x.x.x

 

systemctl stop chronyd

chronyd -q 'server x.x.x.x iburst'

[root@server1 ]#  chronyd -q 'server 192.168.1.100 iburst'
2021-11-25T05:08:34Z chronyd version 3.4 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +SECHASH +IPV6 +DEBUG)
2021-11-25T05:08:34Z Initial frequency -11.868 ppm
2021-11-25T05:08:38Z System clock wrong by 0.000087 seconds (step)
2021-11-25T05:08:38Z chronyd exiting

Show current ntp stauts

ntpq -pn

chronyc [-n] sources