README.md

aws cloudformation create-stack --stack-name hogehoge --template-body file://conf.json --region ap-northeast-1 --parameters file://param.json

conf.json

{
  "AWSTemplateFormatVersion" : "2010-09-09",

  "Description" : "AWS CloudFormation Sample Template VPC_RDS_DB_Instance: Sample template showing how to create an RDS DBInstance in an existing Virtual Private Cloud (VPC). **WARNING** This template creates an Amazon Relational Database Service database instance. You will be billed for the AWS resources used if you create a stack from this template.",

  "Parameters" : {

    "VpcId" : {
      "Type" : "String",
      "Description" : "VpcId of your existing Virtual Private Cloud (VPC)"
    },

    "Subnets" : {
      "Type" : "CommaDelimitedList",
      "Description" : "The list of SubnetIds, for at least two Availability Zones in the region in your Virtual Private Cloud (VPC)"
    },

    "DBName": {
      "Default": "MyDatabase",
      "Description" : "The database name",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "64",
      "AllowedPattern" : "[a-zA-Z][a-zA-Z0-9]*",
      "ConstraintDescription" : "must begin with a letter and contain only alphanumeric characters."
    },

    "DBUsername": {
      "Default": "postgres",
      "NoEcho": "true",
      "Description" : "The database admin account username",
      "Type": "String",
      "MinLength": "1",
      "MaxLength": "16",
      "AllowedPattern" : "[a-zA-Z][a-zA-Z0-9]*",
      "ConstraintDescription" : "must begin with a letter and contain only alphanumeric characters."
    },

    "DBPassword": {
      "Default": "password",
      "NoEcho": "true",
      "Description" : "The database admin account password",
      "Type": "String",
      "MinLength": "8",
      "MaxLength": "41",
      "AllowedPattern" : "[a-zA-Z0-9]*",
      "ConstraintDescription" : "must contain only alphanumeric characters."
    },

    "DBClass" : {
      "Default" : "db.t2.micro",
      "Description" : "Database instance class",
      "Type" : "String",
      "AllowedValues" : ["db.t2.micro", "db.t2.small"],
      "ConstraintDescription" : "must select a valid database instance type."
    },

    "DBAllocatedStorage" : {
      "Default": "5",
      "Description" : "The size of the database (Gb)",
      "Type": "Number",
      "MinValue": "5",
      "MaxValue": "1024",
      "ConstraintDescription" : "must be between 5 and 1024Gb."
    }
  },

  "Resources" : {

    "MyDBSubnetGroup" : {
      "Type" : "AWS::RDS::DBSubnetGroup",
      "Properties" : {
        "DBSubnetGroupDescription" : "Subnets available for the RDS DB Instance",
        "SubnetIds" : { "Ref" : "Subnets" }
      }
    },


    "myVPCSecurityGroup" : {
        "Type" : "AWS::EC2::SecurityGroup",
        "Properties" :
        {
           "GroupDescription" : "Security group for RDS DB Instance.",
           "VpcId" : { "Ref" : "VpcId" }
        }
    },

    "MyDB" : {
      "Type" : "AWS::RDS::DBInstance",
      "Properties" : {
        "DBName" : { "Ref" : "DBName" },
        "AllocatedStorage" : { "Ref" : "DBAllocatedStorage" },
        "DBInstanceClass" : { "Ref" : "DBClass" },
        "Engine" : "postgres",
        "EngineVersion" : "9.3",
        "MasterUsername" : { "Ref" : "DBUsername" } ,
        "MasterUserPassword" : { "Ref" : "DBPassword" },
        "DBSubnetGroupName" : { "Ref" : "MyDBSubnetGroup" },
        "VPCSecurityGroups" : [ { "Ref" : "myVPCSecurityGroup" }  ]
      }
    }
  }
}

param.json

[
  {
    "ParameterKey": "VpcId",
    "ParameterValue": "your-vpc-id"
  },
  {
    "ParameterKey": "Subnets",
    "ParameterValue": "your-subnet-id-1, your-subnet-id-2"
  }
]