You can use a Security Group to control access to a private DB instance in the AWS environment. Below are the steps to create a Security Group for a DB instance in the VPC interface:
In the VPC interface, select Security Groups.
Choose Create Security Group to create a new Security Group for the private DB instance.
Provide a name for the Security Group:
Select the VPC you have created to associate the Security Group with it.
Configure Inbound rules to determine which sources are allowed to access the DB instance. For example:
Congratulations! You have successfully created a Security Group for a private DB instance in the AWS environment.
Note: It is not recommended to share Security Groups between DB instances and Amazon EC2 instances to ensure separate security and management for each resource.