serverless.yml

# Welcome to Serverless!
#
# This file is the main config file for your service.
# It's very minimal at this point and uses default values.
# You can always add more config options for more control.
# We've included some commented out config examples here.
# Just uncomment any of them to get that config option.
#
# For full config options, check the docs:
#    docs.serverless.com
#
# Happy Coding!

service: blue-green-deployment

custom:
  bucket: ${file(./env.yml):${self:custom.stage}.bucket}
  profile: ${file(./env.yml):${self:custom.stage}.profile}
  region: ${file(./env.yml):${self:custom.stage}.region}
  stage: ${opt:stage, self:provider.stage}
  suffix: ${self:service}-${self:custom.stage}
  prefix: ${self:custom.stage}-${self:service}
  process: process-${self:custom.suffix}

provider:
  name: aws
  runtime: python3.6
  environment: ${file(./env.yml):${self:custom.stage}}
  stage: ${self:custom.stage}
  region: ${self:custom.region}
  profile: ${self:custom.profile}
  deploymentBucket: ${self:custom.bucket}

  iamRoleStatements:
    # provide access permission to existing deployment bucket
    - Effect: Allow
      Action:
        - s3:PutObject
        - s3:ListBucket
        - s3:GetObject
      Resource: arn:aws:s3:::${self:custom.bucket}/*
    - Effect: Allow
      Action:
        - ssm:DescribeParameters
        - ssm:GetParameter
        - ssm:GetParameters
        - ssm:GetParameterHistory
        - ssm:PutParameter
      Resource: arn:aws:ssm:${self:custom.region}:*:parameter/*
    - Effect: Allow
      Action:
        - ec2:*
        - autoscaling:*
        - elasticloadbalancing:*
      Resource: '*'

functions:
  switch:
    name: ${self:custom.process}
    handler: handler.switch

# Additional Resources required by the serverless code to do its job
resources:
  Resources:
    prodElbParameter:
      Type: AWS::SSM::Parameter
      Properties:
        Name: '/prod/prod_elb'
        Description: 'Parameter Store for Current Production ELB Name'
        Type: 'String'
        Value: 'Null'
    tempElbParameter:
      Type: AWS::SSM::Parameter
      Properties:
        Name: '/prod/temp_elb'
        Description: 'Parameter Store for Temp Production ELB Name'
        Type: 'String'
        Value: 'Null'
    prodAsgParameter:
      Type: AWS::SSM::Parameter
      Properties:
        Name: '/prod/prod_asg'
        Description: 'Parameter Store for Current Production ASG Name'
        Type: 'String'
        Value: 'Null'
    newAsgParameter:
      Type: AWS::SSM::Parameter
      Properties:
        Name: '/prod/temp_asg'
        Description: 'Parameter Store for New Production ASG Name'
        Type: 'String'
        Value: 'Null'
    DeploymentStateParameter:
      Type: AWS::SSM::Parameter
      Properties:
        Name: '/prod/deployment/current_state'
        Description: 'Parameter Store for the Active Prod Server State'
        Type: 'String'
        Value: 'Null'