chrony

a flexible implementation of the Network Time Protocol.

Centos 7 & 8

$ sudo dnf install chrony
$ sudo systemctl enable/start chronyd
$ sudo chronyd -q 'server 3.pool.ntp.org iburst'
$ sudo chronyc -a makestep
$ sudo chronyc tracking
$ sudo chronyc sources
$ sudo chronyc sourcestats -v
$ sudo vim /etc/chrony.conf
$ sudo firewall-cmd --add-service=ntp --permanent
$ sudo firewall-cmd --reload
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