Use an ENI for Quick Fault Recovery

This lab describes how to use Alibaba Cloud Elastic Network Interfaces (ENIs). An ENI is a virtual network card that can be attached to an ECS instance in a VPC. With ENIs, you can build high availability clusters, implement failover at a low cost, and achieve refined network management. In this lab, we use the master and slave environments of MySQL to simulate the emergency response to master database downtime in the production environment. By changing the object to which the ENI