cloudformation-template-service.yaml

Parameters:

  ServiceImage:
    Type: String
    Description: The repository URI of the application image
    Default: mmitrofan/whoami:latest

  ApplicationName:
    Type: String
    Description: The application Name
    Default: whoami

  Environment:
    Type: String
    AllowedValues:
      - dev
      - staging
      - prod
    Default: dev

  EcsCluster:
    Type: String
    Default: services-cluster
    Description: The cluster in which to deploy this service

  Domain:
    Type: String
    Description: Domain in which tasks should be registered to - MUST already exist as a zone in Route53
    Default: example.com

  TraefikStack:
    Type: String
    Description: The name of the CloudFormation stack which contains the traefik service
    Default: traefik-srv

Resources:

  LogGroup:
    Type: AWS::Logs::LogGroup
    Properties: 
      LogGroupName:
        Fn::Sub: ${AWS::StackName}-LogGroup
      RetentionInDays: 14

  TaskDef:
    Type: AWS::ECS::TaskDefinition
    Properties:
      ContainerDefinitions:
        - Name: !Ref ApplicationName
          Image: !Ref ServiceImage
          PortMappings:
            - ContainerPort: 80
          Memory: 512
          MemoryReservation: 256
          DockerLabels:
            traefik.frontend.rule: !Join
              - .
              - - !Join [ "-", [ !Sub "Host: ${ApplicationName}", !Select ["1", !Split [":", !Ref ServiceImage]] ] ]
                - !Ref Environment
                - !Ref Domain
            traefik.enable: "true"
            traefik.protocol: "http"
            traefik.backend.loadbalancer.method: "wrr"
            traefik.backend.loadbalancer.stickiness: "true"
            traefik.backend.loadbalancer.stickiness.cookieName: !Join
              - .
              - - cookie
                - !Join [ "-", [ !Sub "${ApplicationName}", !Select ["1", !Split [":", !Ref ServiceImage]] ] ]
                - !Ref Environment
                - !Ref Domain
            traefik.backend.loadbalancer.stickiness.cookieName: "true"
          LogConfiguration:
            LogDriver: awslogs
            Options:
              awslogs-region:
                Ref: AWS::Region
              awslogs-group: !Ref LogGroup
              awslogs-stream-prefix:
                Ref: AWS::StackName
          Ulimits:
            - HardLimit: 65536
              SoftLimit: 10240
              Name: nofile

  Service:
    Type: AWS::ECS::Service
    Properties:
      Cluster: !Ref EcsCluster
      TaskDefinition: !Ref TaskDef
      DesiredCount: 1
      PlacementStrategies:
        - Field: attribute:ecs.availability-zone
          Type: spread
        - Field: instanceId
          Type: spread

  DnsRecord:
    Type: AWS::Route53::RecordSet
    Properties:
      Name: !Join
        - .
        - - !Join [ "-", [ !Sub "${ApplicationName}", !Select ["1", !Split [":", !Ref ServiceImage]] ] ]
          - !Ref Environment
          - !Ref Domain
      HostedZoneName: !Sub "${Domain}."
      Type: A
      AliasTarget:
        DNSName:
          Fn::ImportValue: !Sub ${TraefikStack}-TraefikAlbDualstackName
        HostedZoneId:
          Fn::ImportValue: !Sub ${TraefikStack}-TraefikAlbHostedZone