Set up a Network Time Service on Oracle Linux 7

This sets up a Network Time Service on Oracle Linux 7 hosts using chronyd to synchronize time on the hosts to use in the deployment.

1. On each Kubernetes control plane and worker node, install the chrony package, if it is not already installed:

   sudo yum install chrony

2. Edit the NTP configuration in /etc/chrony.conf. Your requirements may vary. If you are using DHCP to configure the networking for each node, it is possible to configure NTP servers automatically. If you have not got a locally configured NTP service that your systems can sync to, and your systems have Internet access, you can configure them to use the public pool.ntp.org service. See https://www.ntppool.org/.

3. Make sure NTP is enabled to restart at boot and that it is started before you proceed with the Oracle Cloud Native Environment installation. For example:

   sudo systemctl enable --now chronyd.service