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In this best practice, we implemented Network Time Protocol (NTP). The NTP synchronizes the clocks on the servers for the time to be consistent across all databases.
Overview
NTP is used to synchronize clocks between computer systems using the network. In implementing NTP our Oracle database servers will be synchronized which is important for analyzing the systems, scheduling jobs, and perhaps implementing Oracle Real Application Clusters. This is a configuration best practice as the goal is to have all our database servers synchronized from the same NTP server.
Implementation Steps
In Red Hat 8, the NTP protocol is implemented by the chrony daemon through the chrony package.
The steps to configure the daemon:
# yum install chrony -y
2. Edit /etc/chrony.conf file by adding a NTP server entry.
For example, adding NTP server 10.230.82.70 with this entry: “server 10.230.82.70 iburst”
3. To start chronyd:
# systemctl start chronyd
4. To stop chronyd:
# systemctl stop chronyd
5. To ensure chronyd starts automatically at system start,
# systemctl enable chronyd
6. To check if chrony is synchronized:
# chronyc tracking
7. To check chrony source:
# chronyc sources
8. To check chrony source statistics:
# chronyc sourcestats
Additional Resources
Configuring Basic System Settings, Red Hat Enterprise Linux 8