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2.4. Network Time Protocol
Use Network Time Protocol (NTP) on each system in your OpenStack environment to synchronize all the services. Start by configuring NTP on the controller node, and make sure the same external NTP servers that are commonly used within your organization are also set here. Then, set the rest of the systems in your OpenStack environment to take their synchronization information from the controller node.
Use external NTP servers that are synchronized from various sources and routed via different networks.
If multiple controller nodes are present in your OpenStack environment, pay special attention to the synchronization of their clocks, as even a small drift can cause problems for the other systems. In such an environment, it is also worthwhile for the systems to take their synchronization information from multiple controller nodes in case one of them becomes unavailable.
Instructions on how to configure NTP are available in the System Administrator's Guide for Red Hat Enterprise Linux 7.