Sample CloudFormation template for freeform configuration using AWS AppConfig

appconfig-freeform-demo.cfn.yaml

AWSTemplateFormatVersion: "2010-09-09"
Description: CloudFormation template used for showcasing AWS AppConfig feature flags

Parameters:
  AppName:
    Type: String
    Description: "Name of application associated with AppConfig instance."
    AllowedPattern: ".+"

  CostCenter:
    Type: String
    Description: "Department responsible for billing of AppConfig instance."
    AllowedPattern: ".+"

Resources:
  AppConfigInstance:
    Type: AWS::AppConfig::Application
    Properties:
      Name: !Ref AppName
      Description: !Sub "AppConfig instance containing all configuration for ${AppName}"
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: APP_NAME
          Value: !Ref AppName

  # Environments
  DevEnvironment:
    Type: AWS::AppConfig::Environment
    Properties:
      Name: "dev"
      Description: !Sub "Dev environment for ${AppName}"
      ApplicationId: !Ref AppConfigInstance
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "dev"
        - Key: APP_NAME
          Value: !Ref AppName

  UatEnvironment:
    Type: AWS::AppConfig::Environment
    Properties:
      Name: "uat"
      Description: !Sub "UAT environment for ${AppName}"
      ApplicationId: !Ref AppConfigInstance
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "uat"
        - Key: APP_NAME
          Value: !Ref AppName

  PrdEnvironment:
    Type: AWS::AppConfig::Environment
    Properties:
      Name: "prd"
      Description: !Sub "PRD environment for ${AppName}"
      ApplicationId: !Ref AppConfigInstance
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "prd"
        - Key: APP_NAME
          Value: !Ref AppName

  # Configuration Profile
  EnabledInferenceConfigProfile:
    Type: AWS::AppConfig::ConfigurationProfile
    Properties:
      ApplicationId: !Ref AppConfigInstance
      Name: !Sub "enabled-inference-profile"
      Description: "Configuration profile for enabled inference"
      LocationUri: hosted
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "prd"
        - Key: APP_NAME
          Value: !Ref AppName

  DisabledInferenceConfigProfile:
    Type: AWS::AppConfig::ConfigurationProfile
    Properties:
      ApplicationId: !Ref AppConfigInstance
      Name: !Sub "disabled-inference-profile"
      Description: "Configuration profile for disabled inference"
      LocationUri: hosted
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "prd"
        - Key: APP_NAME
          Value: !Ref AppName

  # Feature Flags
  EnableMLInference:
    Type: AWS::AppConfig::HostedConfigurationVersion
    Properties:
      ApplicationId: !Ref AppConfigInstance
      ConfigurationProfileId: !Ref EnabledInferenceConfigProfile
      Description: "Freeform config for toggling ML inferencing routines"
      Content: !Sub |
        {
          "enableInference": true
        }
      ContentType: "application/json"

  DisableMLInference:
    Type: AWS::AppConfig::HostedConfigurationVersion
    Properties:
      ApplicationId: !Ref AppConfigInstance
      ConfigurationProfileId: !Ref DisabledInferenceConfigProfile
      Description: "Freeform config used for toggling ML inferencing routines"
      Content: !Sub |
        {
          "enableInference": false
        }
      ContentType: "application/json"

  # Deployment Strategies
  QuickSwapDeploymentStrategy:
    Type: AWS::AppConfig::DeploymentStrategy
    Properties:
      Name: "AllAtOnce.ImmediateSwap"
      Description: "Deployment strategy used for immediate swapping of configuration"
      DeploymentDurationInMinutes: 0
      FinalBakeTimeInMinutes: 0
      GrowthFactor: 100
      GrowthType: LINEAR
      ReplicateTo: NONE
      Tags:
        - Key: COST_CENTER
          Value: !Ref CostCenter
        - Key: ENVIRONMENT
          Value: "prd"
        - Key: APP_NAME
          Value: !Ref AppName

  # Deploy to environments
  DevConfigDeployment:
    Type: AWS::AppConfig::Deployment
    Properties:
      ApplicationId: !Ref AppConfigInstance
      ConfigurationProfileId: !Ref DisabledInferenceConfigProfile
      ConfigurationVersion: !Ref DisableMLInference
      DeploymentStrategyId: !Ref QuickSwapDeploymentStrategy
      EnvironmentId: !Ref DevEnvironment

  UatConfigDeployment:
    Type: AWS::AppConfig::Deployment
    Properties:
      ApplicationId: !Ref AppConfigInstance
      ConfigurationProfileId: !Ref DisabledInferenceConfigProfile
      ConfigurationVersion: !Ref DisableMLInference
      DeploymentStrategyId: !Ref QuickSwapDeploymentStrategy
      EnvironmentId: !Ref UatEnvironment

  PrdConfigDeployment:
    Type: AWS::AppConfig::Deployment
    Properties:
      ApplicationId: !Ref AppConfigInstance
      ConfigurationProfileId: !Ref EnabledInferenceConfigProfile
      ConfigurationVersion: !Ref EnableMLInference
      DeploymentStrategyId: !Ref QuickSwapDeploymentStrategy
      EnvironmentId: !Ref PrdEnvironment