Overview

Why Automatic Traffic Switchover?

MCI provides load balancing and traffic routing across clusters to improve the availability and reliability of applications. However, when a cluster is faulty, service requests allocated by MCI to the cluster will be rejected.

UCS provides automatic traffic switchover to automatically redirect traffic to an available cluster for service availability. You can use this feature in the following scenarios:

Cluster fault identification and automatic traffic switchover: When CoreDNS in a cluster is faulty, the system automatically detects the fault and reports the fault to the control plane in a timely manner. Traffic will then be redirected to an available cluster to prevent service unavailability caused by a single component failure. For details, see Configuring Conditional Automatic Traffic Switchover.
Traffic switchover in advance for smooth upgrade: The traffic to a cluster is redirected before the cluster upgrade and then routed back to the cluster once the upgrade is complete. In this way, the upgrade of a cluster will not affect the availability of services. For details, see Configuring Unconditional Automatic Traffic Switchover.