AWS - CFN - Launch RDS PostgreSQL

This is a small template which can be tuned based on your environment.

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "AWS CloudFormation Sample Template for creating an Amazon RDS DB instance: Sample template showing
how to create a DB instance with Enhanced Monitoring enabled. **WARNING** This template creates an RDS DB instance. You will
be billed for the AWS resources used if you create a stack from this template.",

    "Parameters": {
        "DBInstanceID": {
            "Default": "pgcfn",
            "Description": "My database instance",
            "Type": "String",
            "MinLength": "1",
            "MaxLength": "63",
            "AllowedPattern": "[a-zA-Z][a-zA-Z0-9]*",

            "ConstraintDescription": "Must begin with a letter and must not end with a hyphen or contain two consecutive hyphens."
        },
        "DBName": {
            "Default": "rssaha",
            "Description": "My database",
            "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."
        },
        "DBInstanceClass": {
            "Default": "db.m5.large",

            "Description": "DB instance class",
            "Type": "String",
            "ConstraintDescription": "Must select a valid DB instance type."
        },
        "DBAllocatedStorage": {
            "Default": "100",
            "Description": "The size of the database (GiB)",
            "Type": "Number",
            "MinValue": "5",
            "MaxValue": "1024",

            "ConstraintDescription": "must be between 20 and 65536 GiB."
        },
        "DBUsername": {
            "NoEcho": "true",
            "Description": "Username for PG database access",
            "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": {
            "NoEcho": "true",
            "Description": "Password PG database access",
            "Type": "String",
            "MinLength": "8",
            "MaxLength": "41",
            "AllowedPattern": "[a-zA-Z0-9]*",
            "ConstraintDescription": "must contain only alphanumeric characters."
        }
    },
    "Resources": {
        "MyDB": {
            "Type": "AWS::RDS::DBInstance",
            "Properties": {
                "DBInstanceIdentifier": {
                    "Ref": "DBInstanceID"
                },

                "DBName": {
                    "Ref": "DBName"
                },
                "DBInstanceClass": {
                    "Ref": "DBInstanceClass"
                },
                "AllocatedStorage": {
                    "Ref": "DBAllocatedStorage"
                },
                "Engine": "postgres",
                "EngineVersion": "10.6",
                "MasterUsername": {

                    "Ref": "DBUsername"
                },
                "MasterUserPassword": {
                    "Ref": "DBPassword"

                }
            }
        }
    }
}