Why can't I launch an Amazon RDS DB instance in a specific Amazon VPC?

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I receive an error message when I launch an Amazon Relational Database Service (Amazon RDS) DB instance in an Amazon Virtual Private Cloud (Amazon VPC).

Resolution

To launch an Amazon RDS DB instance in a specific Amazon VPC, set up the Amazon VPC and the DB instance according to these requirements:

  • Use an Amazon VPC with at least two subnets in the AWS Region where you want to deploy your DB instance. If an Amazon VPC doesn't have at least two subnets, then you receive the following error message: "VPC must have a minimum of 2 subnets in order to create a DB Subnet Group. Go to the VPC console to add subnets."
  • Create a DB subnet group and include only the subnets you want Amazon RDS to launch DB instances in to. If a DB subnet group isn't created, then Amazon RDS creates a DB subnet group that includes all subnets for the Amazon VPC. Each DB subnet group must have subnets in at least two Availability Zones in an AWS Region. If your subnet group doesn't include subnets from at least two Availability Zones, then you receive following error message: "DB Subnet Group doesn't meet availability zone coverage requirement. Please add subnets to cover at least 2 availability zones."
  • Use an approved Amazon Elastic Compute Cloud (Amazon EC2) Dedicated Instance type. This allows you to have your DB instance in a dedicated Amazon VPC with an instance tenancy attribute that's set to Dedicated. If you use an instance type that isn't supported for a dedicated Amazon VPC, then the Amazon VPC isn't listed.

Note: If the Amazon VPC attributes DNS hostnames and DNS resolution aren't turned on, then the Amazon VPC is listed when you choose Launch RDS Instance. However, if you launch an instance that's Publicly Accessible, then you receive the following error message: "Cannot create a publicly accessible DB Instance. The specified VPC does not support DNS resolution, DNS hostnames, or both. Update the VPC and then try again."

Related information

Creating a DB instance in a VPC

Working with a DB instance in a VPC

How do I change the Amazon VPC for an Amazon RDS DB instance?

DNS attributes in your VPC

Working with DB subnet groups

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AWS OFFICIALUpdated 9 months ago