MySQLのRDSを作成するCloudFormationのテンプレート

MySQLのRDSを作成するCloudFormationのテンプレート.json

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Parameters": {
        "ProjectName": {
            "Type": "String",
            "Default": "suzlab"
        },
        "DbSubnetGroupName": {
            "Type": "String",
            "Default": "xxxxxxxx"
        },
        "VpcSecurityGroup": {
            "Type": "AWS::EC2::SecurityGroup::Id",
            "Default": "sg-yyyyyyyy"
        }
    },
    "Resources": {
        "DbInstance": {
            "Type": "AWS::RDS::DBInstance",
            "Properties": {
                "Engine": "MySQL",
                "AllocatedStorage": "5",
		"MasterUsername": "root",
                "DBInstanceClass": "db.t2.micro",
                "DBSubnetGroupName": { "Ref": "DbSubnetGroupName" },
                "DBInstanceIdentifier": { "Ref": "ProjectName" },
                "VPCSecurityGroups": [ { "Ref": "VpcSecurityGroup"} ],
                "MasterUserPassword":  { "Fn::Join" : [ "", [
                    { "Ref": "ProjectName" },
                    "!Z3"
                ] ] }
            },
	    "DeletionPolicy": "Snapshot"
        }
    }
}