The Chrony is a default NTP (Network Time Protocol) client as well as an NTP server on RHEL / CentOS 8.
Table of Contents
Check Current Time
At first, let’s check the current date & time:
You’ll see the output like:
Local time: Fri 2020-03-20 13:26:10 +06 Universal time: Fri 2020-03-20 07:26:10 UTC RTC time: Fri 2020-03-20 07:20:10 Time zone: Asia/Dhaka (+06, +0600) System clock synchronized: no NTP service: no RTC in local TZ: no
The System clock synchronized & the NTP service’s value is no.
Chrony is available in the DNF package manager. Just run this command to install Chrony:
sudo dnf install -y chrony
After installing Chrony, we need to start & enable:
# start systemctl start chronyd # enable systemctl enable chronyd
We can check the status of Chrony using this command:
systemctl status chronyd
Check Time Again
Let’s check the time again:
Local time: Fri 2020-03-20 13:20:10 +06 Universal time: Fri 2020-03-20 07:20:10 UTC RTC time: Fri 2020-03-20 07:20:10 Time zone: Asia/Dhaka (+06, +0600) System clock synchronized: yes NTP service: active RTC in local TZ: no
Now our server is showing the correct date & time. The System clock synchronized is yes & the NTP service’s value is active.
Config NTP Client
If you don’t know about the NTP client, you can skip this.
If you want to NTP client, open
/etc/chrony.conf with your favorite editor:
sudo nano /etc/chrony.conf
To configure a system as an NTP client, it needs to know which NTP servers it should ask for the current time. You can specify the servers using the pool or server directive.
Comment out the default NTP servers and set your server IP address:
# Please consider joining the pool (http://www.pool.ntp.org/join.html). # pool 2.centos.pool.ntp.org iburst server YOUR_SERVER_IP
Save the file and restart Chrony:
sudo systemctl restart chronyd
Check for NTP server sources. Your local NTP server should be listed:
Check NTP client list on the NTP server:
To know more about Chrony, run this command:
That’s all. Thank you. 🙂