Template for a basic serverless file

serverless.yml

service: service-name

provider:
  name: aws
  stage: ${opt:stage, 'prod'}
  runtime: ${opt:runtime, 'python3.8'}
  region: ${opt:region, 'eu-west-1'}
  deploymentBucket:
    name: deployment_bucket_name
  iamRoleStatements: 
    - Effect: 'Allow'
      Action: '*'
      Resource: '*'
    - Effect: "Allow"
      Action:
        - "s3:GetObject"
        - "s3:GetObjectVersion"
      Resource:
        - "arn:aws:s3:::${file(env.yml):${self:provider.stage}.netbox_data_bucket_name}/*"
        - "arn:aws:s3:::${file(env.yml):${self:provider.stage}.infoblox_data_bucket_name}/${file(env.yml):${self:provider.stage}.infoblox_data_bucket_key}"
    - Effect: "Allow"
      Action:
        - "ssm:GetParameter"
      Resource:
        - "arn:aws:ssm:#{AWS::Region}:#{AWS::AccountId}:parameter${file(env.yml):${self:provider.stage}.vault_token_path}"
    - Effect: "Allow"
      Action: "kms:Decrypt"
      Resource: "arn:aws:kms:#{AWS::Region}:#{AWS::AccountId}:key/*"
  environment:
    LOG_LEVEL: ${file(env.yml):${self:provider.stage}.log_level}

custom:
  variable_name: variable_value

package:
  individually: true
  excludeDevDependencies: false
  exclude:
    - node_modules/**
    - serverless_deployment/**
    - assets/**
    - tests/**

functions:
  lambda_function:
    handler: src/lambda_function.lambda_handler
    name: ${self:service.name}-${self:provider.stage}-lambda_function
    description: This does something
    timeout: 900
    environment:
      env_var_name: ${self:custom.variable_name}

stepFunctions:
  stateMachines:
    NetboxExportStateMachine:
      name: ${file(env.yml):${self:provider.stage}.state_machine_name}
      events:
        - schedule: cron(0 9 ? * SAT *)
      definition:
        Comment: "Netbox export"
        StartAt: InitState
        States:
          InitState:
            Type: Parallel
            Branches:
            - StartAt: NetboxExport
              States:
                NetboxExport:
                  Type: Task
                  Resource:
                    Fn::GetAtt: [export, Arn]
                  End: True
            Catch:
            - ErrorEquals: ["States.ALL"]
              Next: NotifyFailure
            Next: Success
          Success: 
            Type: Succeed
          NotifyFailure:
            Type: Task
            Parameters:
              State: Failure
              Input.$: $
            Resource: 
              Fn::GetAtt: [pager, Arn]
            Next: Failure
          Failure:
            Type: Fail

plugins:
  - serverless-step-functions
  - serverless-pseudo-parameters
  - serverless-python-requirements

resources:
  Outputs:
    NetboxExportStateMachine:
      Description: The ARN of the Netbox Export state machine
      Value:
        Ref: NetboxExportStateMachine