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Instance failover

KakaoCloud provides both manual and automatic instance failover. This document describes how to manually fail over a running MySQL instance.

Perform manual failover​

Notes when performing failover
  • Temporary service interruption may occur during failover, and the Standby instance switches to the Primary role.
  • To ensure that the switched instance operates normally, we recommend managing the resource status of Standby role instances, such as storage usage.
  • If there is no suitable Standby instance for failover, the Primary instance may restart and cause service interruption.
  • Manual failover is restricted in the Single state where there is only one instance.
  1. Go to the KakaoCloud Console > Data Store > MySQL menu.
  2. In the Instance Group menu, select the MySQL instance group where you want to perform failover.
  3. Click the Instance tab, then click the [Manual failover] button.
  4. In the Manual failover popup window, click the [Proceed] button.
Endpoint connection notes

MySQL endpoints are provided as FQDNs based on DNS. Since the IP mapped to the domain name may change during failover, please note the following:

  • Do not cache the MySQL endpoint domain name (TTL 0 seconds).
    (Example) TTL setting for Java-based applications: networkaddress.cache.ttl=0
  • All existing connections will be dropped during Primary switching. To ensure availability, always configure your application to reconnect.