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In this example, we will create a DB Subnet Group and add the private subnets from our VPC.
Create a DB Subnet Group and Associate a DB Security Group
Create a DB Subnet Group:
Open the Amazon RDS console at https://console.aws.amazon.com/rds/.
Click DB Subnet Groups in the Navigation list on the left side of the window.

Click the Create DB Subnet Group button.

Type the name of your DB Subnet Group in the Name text box.
Type a description for your DB Subnet Group in the Description text box.
Select the VPC that you created from the VPC ID drop-down list box.
Type a description for your DB Subnet Group in the Description text box.
Click the add all the subnets link in the Add Subnet(s) to this Subnet Group section.

Click the Yes, Create button.
A dialog box will appear indicating that your DB Subnet Group is created.

Click the Close button.
Your new DB Subnet Group will now appear in the DB Subnet Groups list. You can click on it and see details, such as all of the subnets associated with this group, in the details pane at the bottom of the window.

Now that you've created a DB Subnet Group, you can launch a DB Instance to run in your VPC. For an example, continue to Creating a DB Instance in a VPC.