Create Fargate service that starts at 0 and scale upon trigger by SQS eventbridge

Question

I have a function hosted in a container on Fargate that needs to be activated by an SQS message via EventBridge. I am trying to setup the container in an ECS cluster  as a service so the EventBridge works. When setting it up it seems to want to run the task straight away. I would like to have it sat there inactively and then turned on by the EventBridge. This would also require scaling up to 100 or more concurrent runs. Can you advise on what settings would achieve this.

Answer

Despite being a Serverless offering, Fargate is still a container (which doesn’t scale to zero) so it may trigger the task execution the first time.

Check this out for inspiration and troubleshoot https://repost.aws/questions/QUWzWBso4ySf--xcke9Ww3XQ/what-needs-to-be-done-to-make-event-bridge-invoke-a-fargate-task-when-file-added-to-s3

Answer

Hello.

Perhaps the configurations described in the documentation below may be helpful.  
This configuration uses SQS CloudWatch metrics to scale ECS.  
By using this, it is possible to start an ECS task when messages accumulate in SQS.  
https://aws.amazon.com/jp/blogs/containers/amazon-elastic-container-service-ecs-auto-scaling-using-custom-metrics/

Create Fargate service that starts at 0 and scale upon trigger by SQS eventbridge

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