我需要使用Cloudformation在AWS提供的Postgres RDS中创建多个数据库。我可以创建单个数据库。
下面是我的模板片段：

"pgDB": {
    "Properties": {
        "AllocatedStorage": {
            "Ref": "Storage"
        },
        "DBInstanceClass": {
            "Ref": "DBInstanceClass"
        },
        "DBInstanceIdentifier": {
            "Ref": "DBInstanceName"
        },
        "DBName": {
            "Ref": "DBName"
        },
        "DBParameterGroupName": {
            "Ref": "myDBParamGroup"
        },
        "DBSubnetGroupName": {
            "Ref": "myDBSubnetGroup"
        },
        "Engine": "postgres",
        "MasterUserPassword": {
            "Ref": "DBPassword"
        },
        "MasterUsername": {
            "Ref": "DBUser"
        },
        "VPCSecurityGroups": [{
            "Fn::GetAtt": [
                "myDBEC2SecurityGroup",
                "GroupId"
            ]
        }]
    }
}