Chrony

Installation

To install Chrony on your system, you need to run the following command:

sudo apt install chrony

After installation you will need to either reboot the computer or run the following command:

systemctl start chronyd

This will initialize some configuration file that need to be modified.

Now in order for the deamon to start automatically at boot, the following command needs to be run:

systemctl enable chronyd

Configuration steps

Central computer

If the computer on which you are installing Chrony is the central computer, do the following:

  1. Open the configuration file with the following command:

sudo nano /etc/chrony/chrony.conf

  1. Replace the content of the file with the following:

initstepslew 1 LIST_OF_REMOTE_HOSTNAMES_CONNECTED_TO_THIS_COMPUTER
driftfile /var/lib/chrony/drift
local stratum 8
manual
allow 123.456.789.0/24
smoothtime 400 0.01
rtcsync

Note

Replace 123.456.789.0 with the IP subnet used for communication. The 0 indicates that all IP of the form 123.456.789.XXX are allowed.

Remote node computer

If the computer on which you are installing Chrony is a remote node, do this instead

  1. Open the configuration file with the following command:

sudo nano /etc/chrony/chrony.conf

  1. Replace the content of the file with the following:

server HOSTNAME_OF_CENTRAL_COMPUTER iburst
driftfile /var/lib/chrony/drift
allow 123.456.789.0/24
makestep 1.0 3
rtcsync

Note

Replace 123.456.789.0 with the IP subnet used for communication. The 0 indicates that all IP of the form 123.456.789.XXX are allowed.