CloudFormation 条件 EMR 实例

Question

我在 CF 模板中使用条件语句时遇到了一些困难，我想以最简洁的方式有条件地指定 EMR 集群实例组或队列。

这构建没有错误。 如果是 prod，它会选择使用实例组，如果不是 prod，它会选择使用实例队列，使用两个单独的条件：

Parameters:
  EnvironmentName:
    Type: String
    Description: 'Example: ci, qa, stage, prod'
      
Conditions:
  IsPreProd: !Or
    [!Equals [!Ref EnvironmentName, ci], !Equals [!Ref EnvironmentName, qa]]
  IsProd: !Or
    [!Equals [!Ref EnvironmentName, stage], !Equals [!Ref EnvironmentName, prod]]
    
Resources:
  EMRCluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        CoreInstanceGroup:
          !If 
            - IsProd
            - InstanceCount: 1
              InstanceType: m5.8xlarge
              Market: ON_DEMAND
              Name: CoreInstance
            - !Ref "AWS::NoValue"     
        CoreInstanceFleet:
          !If 
            - IsPreProd
            - InstanceTypeConfigs:
                - InstanceType: m5.8xlarge
              TargetOnDemandCapacity: 1
              TargetSpotCapacity: 1
              LaunchSpecifications:
                SpotSpecification:
                  TimeoutAction: SWITCH_TO_ON_DEMAND
                  TimeoutDurationMinutes: 10
            - !Ref "AWS::NoValue" 

  

我只想使用一个条件，如下所示，除了构建失败告诉我“如果”所在的行上的“YAML 格式不正确”。 如果我像上面那样实现它，我最终会得到四个单独的条件，因为我还必须添加主实例组或队列。 是否有可能将这一切作为一个条件？

Parameters:
  EnvironmentName:
    Type: String
    Description: 'Example: ci, qa, stage, prod'
      
Conditions:
  IsProd: !Or
    [!Equals [!Ref EnvironmentName, stage], !Equals [!Ref EnvironmentName, prod]]
    
Resources:
  EMRCluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
        - !If 
            - IsProd
            - CoreInstanceGroup:
                InstanceCount: 1
                InstanceType: m5.8xlarge
                Market: ON_DEMAND
                Name: CoreInstance
            - CoreInstanceFleet:
                InstanceTypeConfigs:
                  - InstanceType: m5.8xlarge
                TargetOnDemandCapacity: 1
                TargetSpotCapacity: 1
                LaunchSpecifications:
                  SpotSpecification:
                    BlockDurationMinutes: 60
                    TimeoutAction: SWITCH_TO_ON_DEMAND
                    TimeoutDurationMinutes: 10   

Answer 1

Instances不是一个列表。 你不需要- before !If ：

Resources:
  EMRCluster:
    Type: 'AWS::EMR::Cluster'
    Properties:
      Instances:
         !If 
            - IsProd
            - CoreInstanceGroup:
                InstanceCount: 1
                InstanceType: m5.8xlarge
                Market: ON_DEMAND
                Name: CoreInstance
            - CoreInstanceFleet:
                InstanceTypeConfigs:
                  - InstanceType: m5.8xlarge
                TargetOnDemandCapacity: 1
                TargetSpotCapacity: 1
                LaunchSpecifications:
                  SpotSpecification:
                    BlockDurationMinutes: 60
                    TimeoutAction: SWITCH_TO_ON_DEMAND
                    TimeoutDurationMinutes: 10