amazon-web-services - 如何使用 Cloud Formation 模板自动扩展 DynamoDB？

Question

创建DynamoDB CloudFormation模板时，您需要指定ProvisionedThroughput:

http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-dynamodb-table.html#cfn-dynamodb-table-provisionedthroughput

但我还看到这个文档，其中提到当您通过控制台创建表时，默认情况下会设置自动缩放。

http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ProvisionedThroughput.html#HowItWorks.ProvisionedThroughput.AutoScaling

我的问题是:我需要对 Cloudformation 做一些特殊的事情才能让我的 DynamoDB 表自动缩放吗？

Answer 1

使用 CloudFormation 配置 Auto Scaling DynamoDB 尚不可用。

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CloudFormation 不会立即支持 AWS 服务的新功能，这是很常见的情况。添加支持的延迟时间可能会有所不同，但通常需要几个月的时间。

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编辑

亚马逊刚刚宣布Target Tracking Policies这就是在 CloudFormation 中使用单独的资源类型 AWS::ApplicationAutoScaling::ScalingPolicy 来完成此操作的方式。 .

您仍必须为 DynamoDB 表配置特定的读取和写入吞吐量，但单独配置读取的扩展策略和另一个写入策略。

亚马逊在其文档中提供了以下示例。

{
  "Resources": {
    "DDBTable": {
      "Type": "AWS::DynamoDB::Table",
      "Properties": {
        "AttributeDefinitions": [
          {
            "AttributeName": "ArtistId",
            "AttributeType": "S"
          },
          {
            "AttributeName": "Concert",
            "AttributeType": "S"
          },
          {
            "AttributeName": "TicketSales",
            "AttributeType": "S"
          }
        ],
        "KeySchema": [
          {
            "AttributeName": "ArtistId",
            "KeyType": "HASH"
          },
          {
            "AttributeName": "Concert",
            "KeyType": "RANGE"
          }
        ],
        "GlobalSecondaryIndexes": [
          {
            "IndexName": "GSI",
            "KeySchema": [
              {
                "AttributeName": "TicketSales",
                "KeyType": "HASH"
              }
            ],
            "Projection": {
              "ProjectionType": "KEYS_ONLY"
            },
            "ProvisionedThroughput": {
              "ReadCapacityUnits": 5,
              "WriteCapacityUnits": 5
            }
          }
        ],
        "ProvisionedThroughput": {
          "ReadCapacityUnits": 5,
          "WriteCapacityUnits": 5
        }
      }
    },
    "WriteCapacityScalableTarget": {
      "Type": "AWS::ApplicationAutoScaling::ScalableTarget",
      "Properties": {
        "MaxCapacity": 15,
        "MinCapacity": 5,
        "ResourceId": { "Fn::Join": [
          "/",
          [
            "table",
            { "Ref": "DDBTable" }
          ]
        ] },
        "RoleARN": {
          "Fn::GetAtt": ["ScalingRole", "Arn"]
        },
        "ScalableDimension": "dynamodb:table:WriteCapacityUnits",
        "ServiceNamespace": "dynamodb"
      }
    },
    "ScalingRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "application-autoscaling.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Path": "/",
        "Policies": [
          {
            "PolicyName": "root",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "dynamodb:DescribeTable",
                    "dynamodb:UpdateTable",
                    "cloudwatch:PutMetricAlarm",
                    "cloudwatch:DescribeAlarms",
                    "cloudwatch:GetMetricStatistics",
                    "cloudwatch:SetAlarmState",
                    "cloudwatch:DeleteAlarms"
                  ],
                  "Resource": "*"
                }
              ]
            }
          }
        ]
      }
    },
    "WriteScalingPolicy": {
      "Type": "AWS::ApplicationAutoScaling::ScalingPolicy",
      "Properties": {
        "PolicyName": "WriteAutoScalingPolicy",
        "PolicyType": "TargetTrackingScaling",
        "ScalingTargetId": {
          "Ref": "WriteCapacityScalableTarget"
        },
        "TargetTrackingScalingPolicyConfiguration": {
          "TargetValue": 50.0,
          "ScaleInCooldown": 60,
          "ScaleOutCooldown": 60,
          "PredefinedMetricSpecification": {
            "PredefinedMetricType": "DynamoDBWriteCapacityUtilization"
          }
        }
      }
    }
  }
}