cloudformation SFTP transfer service with custom hostname

Question

First off I am very new to AWS cloudformation, been working on templates for a couple months

trying to create a cloudformation template that creates an SFTP transfer service  and adds a custom hostname.
I was able to create the route 53 hostname and it all works fine with the exception the AWS Transfer Family dashboard does not show the Hostname for the server.
I suspect it has to do with tags as I found this [doc](https://docs.aws.amazon.com/transfer/latest/userguide/requirements-dns.html#requirements-use-r53).
I am using a parameter to get the HostedZoneId and use it via HostedZoneId: !Ref HostedZoneIdParam in the SFTPServerDNSRecord resource.
is there a way to use t hat same parameter in a key/value as in Key: aws:transfer:route53HostedZoneId Value: /hostedzone/!Ref HostedZoneIdParam

Any assistance or guidance would be appreciated

Accepted Answer

Hello dnew@,

For Custom Hostname to show up on the Transfer console server dashboard, you'll have to add the the Key/Value pairs `aws:transfer:customHostname` and `aws:transfer:route53HostedZoneId` within the Tags field of the server property.

I'll share an example CloudFormation template snippet below:

```
...
Parameters:
    HostedZoneID:
        Type: String
        Description: "Enter your R53 HostedZone-ID"
    CustomHostname:
        Type: String
        Description: "Enter your Custom Hostname"
Resources:
...
  SFTPServer:
    Type: 'AWS::Transfer::Server'
    Properties:
      Tags:
        - Key: "aws:transfer:customHostname"
          Value: !Ref CustomHostname
        - Key: "aws:transfer:route53HostedZoneId"
          Value: !Join [ '/', [ "/hostedzone", !Ref HostedZoneID] ]
...
```

The above should help you achieve your use-case.
Let me know if you have questions.

References:

[1] https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-transfer-server.html

-- Sagar

Answer

Eventually I have to add this to Resources to add the custom host name to hosted zone:, If someone is struggling with this scenario

```
myDNSRecord:
    Type: AWS::Route53::RecordSet
    Properties:
      HostedZoneId : !Ref HostedZoneIdParam
      Name: !Ref CustomHostname
      ResourceRecords:
        - !Join 
          - ''
          - - !GetAtt SftpServer.ServerId
            - '.server.transfer.'
            - !Ref AWS::Region
            - '.amazonaws.com'
      TTL: 300
      Type: CNAME
```

Answer

The following does add the custom host name but doesn't add the CNAME host record. I have tried all kinds of combination, Not sure what I am missing..
  
```
SftpServer:
    Type: 'AWS::Transfer::Server'
    Properties:
      Protocols: ['SFTP']
      IdentityProviderType: SERVICE_MANAGED
      EndpointType: PUBLIC
        Tags:
        - Key: transfer:route53HostedZoneId
          Value: !Join [ '/', [ "/hostedzone", !Ref HostedZoneIdParam] ]
        - Key: transfer:customHostname
          Value: !Ref CustomHostname
```

cloudformation SFTP transfer service with custom hostname

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