Service Unix Linux chrony a flexible implementation of the Network Time Protocol. Chrony NTP Pool Project Centos 7 & 8 1 2 $ sudo dnf install chrony $ sudo systemctl enable/start chronyd 1 2 3 4 5 $ sudo chronyd -q 'server 3.pool.ntp.org iburst' $ sudo chronyc -a makestep $ sudo chronyc tracking $ sudo chronyc sources $ sudo chronyc sourcestats -v 1 $ sudo vim /etc/chrony.conf 1 2 $ sudo firewall-cmd --add-service=ntp --permanent $ sudo firewall-cmd --reload