openstack-manuals/doc/install-guide/source/environment-ntp.rst

Network Time Protocol (NTP)

You should install Chrony, an implementation of NTP, to properly synchronize services among nodes. We recommend that you configure the controller node to reference more accurate (lower stratum) servers and other nodes to reference the controller node.

environment-ntp-controller.rst environment-ntp-other.rst environment-ntp-verify.rst