Lambda to ECS Integration in a VPC

Question

How can I use an AWS Lambda function deployed within a VPC to trigger the execution of an Amazon ECS (Elastic Container Service) task or service when a specific event occurs, ensuring that the Lambda function can securely access the ECS service within the VPC?

Answer

Hello.

First, you need to be able to connect to the ECS endpoint from a Lambda connected to the VPC.  
So please tie Lambda to the private subnet of the VPC.  
Then add a route to the NAT Gateway to the private subnet's route table or add an ECS VPC endpoint.  
https://docs.aws.amazon.com/lambda/latest/dg/foundation-networking.html  
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/vpc-endpoints.html

Also, be sure to properly configure the security group tied to Lambda and the ECS security group to access containers launched on the ECS from Lambda.

Lambda to ECS Integration in a VPC

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