Exercise in building out a simple architecture in Serverless & Terraform

• Private API Gateway
• Lambdas
• EventBridge
• • Scheduled
• • Pattern Based Rule
• X-Ray tracing
• SQS Dead letter Queue
• VPC with Private Subnets only
• VPC endpoints to support API Gateway, EventBridge, SSM
• IAM,Security groups,etc to support the design

• To pass variables between Terraform and Serverless you can use the Systems Manager Parameter store, by defining your output in a tf variable

resource "aws_ssm_parameter" "subnets2" {
  name        = "/serverless/subnets2"
  description = "Subnet2 for serverless"
  type        = "String"
  value       =  module.vpc.private_subnets[1]
}

then using the saved parameter in serverless.yml as follows

  vpc:
    subnetIds: 
      - ${ssm:/serverless/subnets1}

• All of the architecture building blocks and interactions were acheivable using both frameworks with the exception of applying the DLQ to the Lambdas, which was'nt possible in version 2.3 due to a race condition. Can probably find another was of doing this or replace with the new Lambda Desinations capability
• X-Ray results where somewhat unexpected as the tracing did not show end to end traces through the eventbridge, could be additional instrumentation required.

Both Terraform and Serverless need configuring for AWS

• Serverless
• Terraform

Serverless needs the serverless-python-requirements plugin installed npm install --save serverless-python-requirements for packaging

• Terraform .014
• Serverless Framework 2.3
• Python 3.8

• Installing Terraform
• Installing Serverless

Build out the terraform first

terraform init
terraform plan
terraform apply

serverless deploy

• TF/Serverless guide
• Burning Monk reference