serverless.yml

service: example

# Note: I write these examples using the latest version of Serverless. I pin the example
# to that version so that I know it will work for you even if you find it a year later.
# Likely, you can remove this line and use the example with any recent version of
# Serverless. Give it a shot if you're using a different version.
# frameworkVersion: '=1.34.1'

custom:
  defaultRegion: us-west-2
  region: ${opt:region, self:custom.defaultRegion}
  stage: ${opt:stage, env:USER}
  prune:
    automatic: true
    number: 5
  lane: ${file(lane.yml):${self:custom.stage}}
  prefix: ${opt:prefix, self:custom.lane.prefix}

plugins:
  - serverless-prune-plugin

provider:
  name: aws
  runtime: nodejs8.10
  stackTags: # NOTE: STAGE is automatically added by SLS
    SLS_SVC_NAME: ${self:service}
  region: ${self:custom.region}
  stage: ${self:custom.stage}

functions:
  albEventConsumer:
    handler: src/handlers/health.check
    events:
      - alb:
          listenerArn:
            ref: Listener
          priority: 1
          conditions:
            path: /v2/check

resources:
  Resources:
    TargetGroup:
      Type: AWS::ElasticLoadBalancingV2::TargetGroup
      Properties:
        TargetType: lambda

    Listener:
      Type: AWS::ElasticLoadBalancingV2::Listener
      Properties:
        DefaultActions:
          - Order: 1
            TargetGroupArn:
              Ref: TargetGroup
            Type: forward
        LoadBalancerArn: arn:aws:elasticloadbalancing:us-west-2:<...>
        Port: 80
        Protocol: HTTP