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Auto Scaling von Anwendungen mit einer Amazon DynamoDB-Tabelle
In diesem Beispiel wird Application Auto Scaling für eine AWS::DynamoDB::Table-Ressource eingerichtet. Die Vorlage definiert eine TargetTrackingScaling-Skalierungsrichtline, die den WriteCapacityUnits-Durchsatz für die Tabelle skaliert.
JSON
{
"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,
"ScaleInCooldown": 60,
"ScaleOutCooldown": 60,
"PredefinedMetricSpecification": {
"PredefinedMetricType": "DynamoDBWriteCapacityUtilization"
}
}
}
}
}
}
YAML
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: !Join
- /
- - table
- !Ref DDBTable
RoleARN: !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: DynamoDBWriteCapacityUtilizationWeitere Informationen finden Sie auch unter
Weitere Informationen finden Sie im Blogbeitrag How to use AWS CloudFormation to configure auto scaling for DynamoDB tables and indexes
Weitere Informationen zu DynamoDB-Ressourcen finden Sie unter. AWS::DynamoDB::Table
