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Amazon EC2 instances that function as web servers can be deployed in the public subnet, and the Amazon RDS DB instances are deployed in the private subnet.

In such a deployment, only the web servers have access to the DB instances.

When creating a DB instance in VPC, you must select a DB subnet group.

The following procedures help you create a DB instance in a VPC.

If your account has a default VPC, you can begin with step 3 because the VPC and DB subnet group have already been created for you.

Amazon RDS uses that DB subnet group and your preferred Availability Zone to select a subnet and an IP address within that subnet to associate with your DB instance.

If the primary DB instance of a Multi-AZ deployment fails, Amazon RDS can promote the corresponding standby and subsequently create a new standby using an IP address of the subnet in one of the other Availability Zones.

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