Clock synchronization is important for the following reasons:
- Several Kubernetes components, in particular etcd, Rook/Ceph, do not work correctly if Nodes' clock drifts by more than 100ms;
- Several data protection regulations require it.
Be aware of the following:
- Some regulations require synchronization with at least two clock sources. This could be two different NTP servers which can be traced to two different atomic clocks.
- Some regulations require synchronization with a specific time source. For example, MSBFS 2020:7 4 kap. 13 § specifically requires synchronization with ntp.se.