CODEWITHSUNDEEP
amazon-web-servicesaws-cloudformationamazon-ecsamazon-route53service-discovery
claytond
claytond

Reputation: 1099

CloudFormation: Access PrivateDnsNamespace as HostedZone

The documentation for ServiceDiscovery::PrivateDnsNamespace states that:

When you create a private DNS namespace, AWS Cloud Map automatically creates an Amazon Route 53 private hosted zone that has the same name as the namespace.

In CloudFormation, is there any way to access the created HostedZone (as a Route53::HostedZone) so I can add additional Route53:RecordSets to it?

For example, I'd like to expose my RDS and ElastiCache (Redis) instance at private DNS entries. I realize this could be the XY problem, but I'm accessing these systems at standard locations in my legacy code and am trying minimize the customization (and thus potential bugs) in my first ECS attempt.

WARNING: While AWS Service Discovery strategies can be used to expose services like DB and RDS, there are several qualifications:

Upvotes: 0

Views: 1083

Answers (1)

jogold
jogold

Reputation: 7397

There's no way to access the created HostedZone in CloudFormation.

Still, if you want to add additional records to this private zone you can use the AWS::ServiceDiscovery::Service and AWS::ServiceDiscovery::Instance resources.

Basically, you need to create one service for your RDS instance and one service for your Redis instance. Then you create instances in your services.

Example for RDS:

RDSSDService:
  Type: AWS::ServiceDiscovery::Service
  Properties:
    DnsConfig:
      DnsRecords:
        - TTL: 60
          Type: CNAME
      NamespaceId:
        Ref: YourNamespace
      RoutingPolicy: WEIGHTED
    Name: my-rds-service # this will become the record name
    NamespaceId:
      Ref: YourNamespace

RDSSDInstance: # If your RDS instance is in the same stack
  Type: AWS::ServiceDiscovery::Instance
  Properties:
    InstanceAttributes:
      AWS_INSTANCE_CNAME:
        Fn::GetAtt:
          - YourInstanceLogicalName
          - Endpoint.Address
    ServiceId:
      Fn::GetAtt:
        - RDSSDService
        - Id
    InstanceId: # this is optional
      Ref: YourInstanceLogicalName

RDSInstance: # If referencing an existing instance
  Type: AWS::ServiceDiscovery::Instance
  Properties:
    InstanceAttributes:
      AWS_INSTANCE_CNAME: xyz.abc.us-east-1.rds.amazonaws.com # or with Fn::ImportValue
    ServiceId:
      Fn::GetAtt:
        - RDSSDService
        - Id
    InstanceId: xyz # this is optional

Upvotes: 2

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