Setup chronyd¶

Requirements¶

To install chronyd you will need the following:

• a installed and supported operating system (e.g. CentOS 8.x)
• root-access
• a fast internet connection

Preliminary Note¶

This procedure is based on a documentation taken from:

• https://www.redhat.com/sysadmin/chrony-time-services-linux
• https://www.ibm.com/docs/en/ess/6.1.0_ent?topic=guide-how-set-up-chronyd-time-server

Install¶

yum install chronyd

Start/Enable Service¶

systemctl enable chronyd
systemctl start chronyd

When you are not running the CentOS Firewall yet, then start it:

systemctl enable firewalld
systemctl start firewalld

add chronyd to the firewall if you are going to serve ntp

firewall-cmd --add-service=ntp --permanent
firewall-cmd --reload

config¶

Edit the /etc/chrony.conf file.

# add offset to source ... this shouldn't be necessary at all!
pool 2.fedora.pool.ntp.org iburst offset 7200
# add one specific ntp-server
server 10.11.12.14 iburst prefer

#allow clients to connect from
allow 10.12.100.0/24

#set local stratum in case no external source is available
#set it as low as possible to give clients a choice on better sources
local stratum 4

Status¶

chronyc sources
chronyc burst 4/4