AWS - Merge cloudformation stack with a VPC - amazon-web-services

Question

I am trying to create a stack in AWS CloudFormation, My template basically consists of Ec2 instance, RDS instance for DB (MySQL engine) and a S3 bucket. but, its throwing error stating (db.t2.micro) this DB instance class cannot be created without a VPC, then I changed the DB instance class to (db.m1.small) again am getting same error. I even created a VPC too, but not sure how do I create my stack within the VPC which I created. I work in my company's AWS account. where already few other VPCs are available.
Thanks in advance :)
Modified the JSON script after getting answers. This script is in working condition and could create stack. TESTED!
Updated Code
{
"AWSTemplateFormatVersion": "2010-09-09",
"Resources": {
"DBSubnetGroup": {
"Type": "AWS::RDS::DBSubnetGroup",
"Properties": {
"DBSubnetGroupDescription": "This subnet belongs to Abdul's VPC",
"DBSubnetGroupName": "somename",
"SubnetIds": [
"subnet-f6b15491",
"subnet-b154569e"
]
}
},
"DB": {
"Type": "AWS::RDS::DBInstance",
"Properties": {
"AllocatedStorage": "5",
"StorageType": "gp2",
"DBInstanceClass": "db.m1.small",
"DBName": "wordpress",
"Engine": "MySQL",
"MasterUsername": "wordpress",
"MasterUserPassword": "Word12345",
"DBSubnetGroupName": {
"Ref": "DBSubnetGroup"
}
}
},
"EC2": {
"Type": "AWS::EC2::Instance",
"Properties": {
"ImageId": "ami-c481fad3",
"InstanceType": "t2.micro",
"SubnetId": "subnet-b154569e"
}
},
"S3": {
"Type": "AWS::S3::Bucket",
"Properties": {
"BucketName": "wp-abdultestbuck"
}
}
}
}

Answer 1

You need to create an AWS::RDS::DBSubnetGroup and then reference in the AWS::RDS::DBInstance
{
"Resources": {
"DBSubnetGroup": {
"Type": "AWS::RDS::DBSubnetGroup",
"Properties": {
"DBSubnetGroupDescription": "",
"SubnetIds": [ "<Subnet ID 1","<Subnet ID 2>" ],
}
},
"DB": {
"Type": "AWS::RDS::DBInstance",
"Properties": {
....
"DBSubnetGroupName": { "Ref": "DBSubnetGroup" }
}
},
"EC2": {
"Type": "AWS::EC2::Instance",
"Properties": {
"ImageId": "ami-c481fad3",
"InstanceType": "t2.micro",
"SubnetId": "<SubnetID>"
}
}
}
}