AWS DynamoDB Streams

AWS DynamoDB Streams ^{Click here for latest}

Scale applications based on AWS DynamoDB Streams

Availability: v2.8+ Maintainer: Community

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Trigger Specification

This specification describes the aws-dynamodb-streams trigger that scales based on the shard count of AWS DynamoDB Streams.

triggers:
- type: aws-dynamodb-streams
  metadata:
    # Required: awsRegion
    awsRegion: "ap-northeast-1"
    # Required: tableName
    tableName: myTableName
    # Optional targetValue
    shardCount: "2"
    # Optional. Default: pod
    identityOwner: pod | operator

Parameter list:

awsRegion - AWS Region for the DynamoDB.
tableName - The target DynamoDB table to which the stream belongs.
shardCount - The target value that a DynamoDB streams consumer can handle. (Default: 2, Optional)
activationShardCount - Target value for activating the scaler. Learn more about activation here. (Default: 0, Optional)
identityOwner - Receive permissions on the DynamoDB and DynamoDB Streams via Pod Identity or from the KEDA operator itself (see below). (Values: pod, operator, Default: pod, Optional)

When identityOwner set to operator - the only requirement is that the KEDA operator has the correct IAM permissions on the DynamoDB and Dynamodb Streams. Additional Authentication Parameters are not required.

Authentication Parameters

These parameters are relevant only when identityOwner is set to pod.

You can use TriggerAuthentication CRD to configure the authenticate by providing either a role ARN or a set of IAM credentials.

Pod identity based authentication:

podIdentity.provider - Needs to be set to either aws-kiam or aws-eks on the TriggerAuthentication and the pod/service account must be configured correctly for your pod identity provider.

Role based authentication:

awsRoleArn - Amazon Resource Names (ARNs) uniquely identify AWS resource.

Credential based authentication:

awsAccessKeyID - Id of the user.
awsSecretAccessKey - Access key for the user to authenticate with.
awsSessionToken - Session token, only required when using temporary credentials.

The user will need access to read properties from the specified AWS DynamoDB and DynamoDB Streams.

Example

Scaling a deployment using IAM Role

apiVersion: v1
kind: Secret
metadata:
  name: test-secrets
  namespace: keda-test
data:
  AWS_ROLE_ARN: <encoded-iam-role-arn>
---
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
  name: keda-trigger-auth-aws-credentials
  namespace: keda-test
spec:
  secretTargetRef:
  - parameter: awsRoleArn    # The property in KEDA.
    name: test-secrets       # The name of the kubernetes secret.
    key: AWS_ROLE_ARN        # The key from the kubernetes secret.
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name:  aws-dynamodb-streams-scaledobject
  namespace: keda-test
spec:
  scaleTargetRef:
    name: nginx-deployment
  triggers:
  - type: aws-dynamodb-streams
    authenticationRef:
      name: keda-trigger-auth-aws-credentials
    metadata:
      awsRegion: ap-northeast-1
      tableName: keda-events
      shardCount: "2"

Scaling a deployment using IAM Users

apiVersion: v1
kind: Secret
metadata:
  name: test-secrets
  namespace: keda-test
data:
  AWS_ACCESS_KEY_ID: <encoded-user-id>       # Required.
  AWS_SECRET_ACCESS_KEY: <encoded-key>       # Required.
  AWS_SESSION_TOKEN: <encoded-session-token> # Required when using temporary credentials.
---
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
  name: keda-trigger-auth-aws-credentials
  namespace: keda-test
spec:
  secretTargetRef:
  - parameter: awsAccessKeyID     # Required.
    name: test-secrets            # Required.
    key: AWS_ACCESS_KEY_ID        # Required.
  - parameter: awsSecretAccessKey # Required.
    name: test-secrets            # Required.
    key: AWS_SECRET_ACCESS_KEY    # Required.
  - parameter: awsSessionToken    # Required when using temporary credentials.
    name: test-secrets            # Required when using temporary credentials.
    key: AWS_SESSION_TOKEN        # Required when using temporary credentials.
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  name:  aws-dynamodb-streams-scaledobject
  namespace: keda-test
spec:
  scaleTargetRef:
    name: nginx-deployment
  triggers:
  - type: aws-dynamodb-streams
    authenticationRef:
      name: keda-trigger-auth-aws-credentials
    metadata:
      awsRegion: ap-northeast-1
      tableName: keda-events
      shardCount: "2"