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VistasServerless Framework how to create an AWS SQS DeadLetter queue?
I am trying to create an AWS SQS Dead Letter Queue, using the serverless framework
The idea is to have a SQS to trigger a Lambda function,
and have another SQS as a DeadLetterQueue, ie. to pick up the message in case the Lambda fails or timesout
I did the following to create a test project -
mkdir dlq
cd dlq/
serverless create --template aws-nodejs
Following is my serverless.yaml -
service: dlq
provider:
name: aws
runtime: nodejs12.x
region: ap-southeast-1
role: arn:aws:iam::xxxx:role/dlqLambdaRole
plugins:
- serverless-plugin-lambda-dead-letter
functions:
dlq:
handler: handler.hello
events:
- sqs:
arn:
Fn::GetAtt:
- MainQueue
- Arn
deadLetter:
targetArn:
GetResourceArn: DeadLetterQueue
resources:
Resources:
MainQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: main
DeadLetterQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: dlq
I also tried the following -
service: dlq
provider:
name: aws
runtime: nodejs12.x
region: ap-southeast-1
role: arn:aws:iam::xxxx:role/dlqLambdaRole
plugins:
- serverless-plugin-lambda-dead-letter
functions:
dlq:
handler: handler.hello
events:
- sqs:
arn:
Fn::GetAtt:
- MainQueue
- Arn
deadLetter:
sqs: dlq
resources:
Resources:
MainQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: main
But in both these cases, the framework is just creating a normal SQS
I am following this document -
https://www.serverless.com/plugins/serverless-plugin-lambda-dead-letter
2 Respuestas
Responde la pregunta0
Better late than never. Hope this helps you or someone searching for this problem.
When you configure SQS to trigger Lambda, the DLQ is supposed to be configured on the SQS(Since it would not be an Asynchronous invocation). Notice the 'Note' section in the link Source
Hence your serverless.yaml needs to declare the ReddrivePolicy in the main queue to refer to the DLQ. (Below)
service: dlq
provider:
name: aws
runtime: nodejs12.x
region: ap-southeast-1
role: arn:aws:iam::xxxx:role/dlqLambdaRole
functions:
dlq:
handler: handler.hello
events:
- sqs:
arn:
Fn::GetAtt:
- MainQueue
- Arn
deadLetter:
targetArn:
GetResourceArn: DeadLetterQueue
resources:
Resources:
MainQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: main
RedrivePolicy:
deadLetterTargetArn:
Fn::GetAtt:
- "DeadLetterQueue"
- "Arn"
maxReceiveCount: 5
DeadLetterQueue:
Type: AWS::SQS::Queue
Properties:
QueueName: dlq
maxReceiveCount is set to 5 as per AWS Documentation.
0
To give you some background, Dead Letter Queue is just that, a normal SQS queue. it's the configuration at AWS Lambda that informs it to push message to this Queue whenever there is any error while processing the message.
You can verify this from the management console by referring to the "Dead-letter queue service" under "Asynchronous invocation"
