tutorial.yaml

Database:
    Type: AWS::RDS::DBInstance # (1)
    Properties:
      VPCSecurityGroups:
        - !Ref DbSecurityGroup # (2)
      AllocatedStorage: "10"
      DBSubnetGroupName: !Ref DbSubnetGroup # (3)
      DBInstanceClass: "db.t2.micro"
      Engine: "postgres"
      MasterUsername: Username
      MasterUserPassword: Password
      MultiAZ: true # (4)

  DbSubnetGroup:
    Type: "AWS::RDS::DBSubnetGroup" # (5)
    Properties:
      DBSubnetGroupDescription: DBSubnetGroup
      SubnetIds: # (6)
        - !Ref PrivateSubnetA
        - !Ref PrivateSubnetB

  DbSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Database
      VpcId: !Ref VPC
      SecurityGroupIngress:
        - FromPort: -1
          IpProtocol: -1
          ToPort: -1
          SourceSecurityGroupId: !Ref InstanceSecurityGroup # (7)