Create DB Group Subnet
- Access RDS interface
- Click Subnet groups.
- Click Create DB subnet group.

- Under Create DB subnet group interface
Subnet group details
- Name:
db-subnet-group
- Description:
Bistro Database Subnet Group
- VPC: Choose the created VPC

Add subnets
- Availability Zones: ap-southeast-1a and ap-southeast-1b
- Subnets: Choose 2 private subnets CIDR placed in 2 different availability zones
Click Create
