As explained, RDS provides high availability via Multi-AZ. To set up Multi-AZ, RDS needs to be configured for two things, the availability zone where the slave RDS instance will be launched and instantiated and enable the Multi-AZ option for the current RDS service:
- From the RDS dashboard navigation pane, click on Subnet Groups. Select default and click on the Edit button:
- The two Availability Zones as per the architecture diagram are us-west-2a and us-west-2c. Hence, click on the Remove button against the us-west-2b AZ. Click on the Edit button:
- You should see the following screen. Click ...