AWS CloudFormation 用於 Auto Scaling 政策 - Amazon ElastiCache

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

AWS CloudFormation 用於 Auto Scaling 政策

此程式碼片段說明如何建立目標追蹤政策，並使用 AWS：：ElastiCache：：ReplicationGroup 資源將其套用至 AWS：ApplicationAutoScaling：： 資源ScalableTarget。其使用 Fn::Join 和 Ref 內部函數來建構 ResourceId 屬性，該屬性具有相同範本中指定的 AWS::ElastiCache::ReplicationGroup 資源的邏輯名稱。

ScalingTarget:
   Type: 'AWS::ApplicationAutoScaling::ScalableTarget'
   Properties:
     MaxCapacity: 3
     MinCapacity: 1
     ResourceId: !Sub replication-group/${logicalName}
     ScalableDimension: 'elasticache:replication-group:NodeGroups'
     ServiceNamespace: elasticache
     RoleARN: !Sub "arn:aws:iam::${AWS::AccountId}:role/aws-service-role/elasticache.application-autoscaling.amazonaws.com/AWSServiceRoleForApplicationAutoScaling_ElastiCacheRG"

  ScalingPolicy:
    Type: "AWS::ApplicationAutoScaling::ScalingPolicy"
    Properties:
      ScalingTargetId: !Ref ScalingTarget
      ServiceNamespace: elasticache
      PolicyName: testpolicy
      PolicyType: TargetTrackingScaling
      ScalableDimension: 'elasticache:replication-group:NodeGroups'
      TargetTrackingScalingPolicyConfiguration:
        PredefinedMetricSpecification:
          PredefinedMetricType: ElastiCachePrimaryEngineCPUUtilization
        TargetValue: 40