terraform/examples/aws-rds/main.tf

resource "aws_db_instance" "default" {
    depends_on = "aws_security_group.default"
    identifier = "${var.identifier}"
    allocated_storage = "${var.storage}"
    engine = "${var.engine}"
    engine_version = "${lookup(var.engine_version, var.engine)}"
    instance_class = "${var.instance_class}"
    name = "${var.db_name}"
    username = "${var.username}"
    password = "${var.password}"
    vpc_security_group_ids = ["${aws_security_group.default.id}"]
    db_subnet_group_name = "${aws_db_subnet_group.default.id}"
}

resource "aws_db_subnet_group" "default" {
    name = "main_subnet_group"
    description = "Our main group of subnets"
    subnet_ids = ["${aws_subnet.subnet_1.id}", "${aws_subnet.subnet_2.id}"]
}