serverless.yml

service: serverless-toggle-vpc-example

frameworkVersion: '>=1.1.0 <2.0.0'

provider:
  name: aws
  runtime: nodejs10.x
  stage: ${opt:stage, 'dev'}
  region: ${opt:region, 'us-east-1'}
  vpc: ${self:custom.vpc.${self:provider.stage}}

custom:
  vpc:
    dev:
      # If you don't want to run Lambda under a Vpc, then just give it an empty array
      securityGroupIds: []
      subnetIds: []
      
    # You can add more stages here

    prod:
      securityGroupIds:
        Fn::Split:
          - ','
          - ${file(secrets.${self:provider.stage}.yml):VPC_SECURITY_GROUP_IDS}
      subnetIds:
        Fn::Split:
          - ','
          - ${file(secrets.${self:provider.stage}.yml):VPC_SUBNET_IDS}

  warmup:
    cleanFolder: true
    memorySize: 256
    timeout: 10
    prewarm: true

functions:
  hello:
    handler: handler.hello
    events:
      - http:
          path: /
          method: get

plugins:
 - serverless-offline
 - serverless-secrets-plugin

# Those plugins can create your Vpc automatically or discover existing
# Vpc from your AWS account
#  - serverless-vpc-plugin
#  - serverless-vpc-discovery