在CloudFormation中为EMR主节点专用IP地址创建记录

您可以尝试使用自定义资源。它可以使用emr：ListInstances来获取IP，然后您可以在Route 53资源中使用该结果。

我没有尝试过，但下面的内容应该可行。如果EMR需要一段时间来创建主节点并且CloudFormation尚未等待，那么您可能必须在那里添加一些延迟。

Resources:
DescribeClusterRole:

Type: AWS::IAM::Role
Properties:
  AssumeRolePolicyDocument:
    Version: '2012-10-17'
    Statement:
      - Action: sts:AssumeRole
        Effect: Allow
        Principal:
          Service: lambda.amazonaws.com
  ManagedPolicyArns:
    - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
  Policies:
    - PolicyName: DescribeCluster
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Action: elasticmapreduce:ListInstances
            Effect: Allow
            Resource: "*"

GetClusterPrivateIP:

Type: AWS::Lambda::Function
Properties:
  Runtime: python3.6
  Handler: index.handler
  Role: !Sub ${DescribeClusterRole.Arn}
  Timeout: 60
  Code:
    ZipFile: |
      import boto3
      import cfnresponse
      import traceback

      def handler(event, context):
        try:
          response = boto3.client('emr').list_instances(
              ClusterId=event['ResourceProperties']['ClusterId'],
              InstanceGroupTypes=['MASTER'],
          )

          ip = response['Instances'][0]['PrivateIpAddress']

          cfnresponse.send(event, context, cfnresponse.SUCCESS, {}, ip)
        except:
          traceback.print_last()
          cfnresponse.send(event, context, cfnresponse.FAIL, {}, "ok")

MasterIp:

Type: Custom::EmrMasterIp
Properties:
  ServiceToken: !Sub ${GetClusterPrivateIP.Arn}
  ClusterId: !Ref rMyEMRCluster

rMyRecordSet:

Type: AWS::Route53::RecordSet
Properties:
  HostedZoneId: !Ref rPrivateHostedZone
  Name: !Sub "sub.example.com"
  Region: ${AWS::Region}
  Type: A
  ResourceRecords:
    !Ref MasterIp

唯一可用的返回值是MasterPublicDNS。但是，这应该解析为主节点的IP地址。

请参阅AWS :: EMR :: Cluster - AWS CloudFormation的“ 返回值”部分。