<% @app,@role,@env = name.sub('.yml','').split('-') -%>
---
AWSTemplateFormatVersion: '2010-09-09'
Description: <%= @app.capitalize %> Stack
Outputs:
  ELBHostname:
    Description: The URL of the website
    Value:
      Fn::Join:
      - ''
      - - http://
        - Fn::GetAtt:
          - elb
          - DNSName
Parameters:
  Ami:
    Default: <%= @ami %>
    Description: Ami id
    Type: String
  Application:
    Default: <%= @app %>
    Description: Application name
    Type: String
  Environment:
    Default: <%= @env %>
    Description: stag, prod etc
    Type: String
  InstanceType:
    AllowedValues:
    - t1.micro
    - m1.small
    - m1.medium
    - m1.large
    - m1.xlarge
    - m2.xlarge
    - m2.2xlarge
    - m2.4xlarge
    - c1.medium
    - c1.xlarge
    - cc1.4xlarge
    - cc2.8xlarge
    - cg1.4xlarge
    - t2.nano
    - t2.micro
    - t2.small
    - t2.medium
    - t2.large
    - t2.xlarge
    - t2.2xlarge
    - m4.large
    - m4.xlarge
    - m4.2xlarge
    - m4.4xlarge
    - m4.10xlarge
    - m4.16xlarge
    ConstraintDescription: must be a valid EC2 instance type.
    Default: <%= @instance_type %>
    Description: WebServer EC2 instance type
    Type: String
  KeyName:
    Default: default
    Description: The EC2 Key Pair to allow SSH access to the instances
    Type: String
  Role:
    Default: <%= @role %>
    Description: redis, psql, app, etc
    Type: String
  WebServerPort:
    Default: '<%= @port %>'
    Description: The TCP port for the Web Server
    Type: Number
Resources:
  CPUAlarmHigh:
    Properties:
      AlarmActions:
      - Ref: WebServerScaleUpPolicy
      AlarmDescription: Scale-up if CPU > <%= @high_threshold %>% for <%= @high_mins %>
      ComparisonOperator: GreaterThanThreshold
      Dimensions:
      - Name: AutoScalingGroupName
        Value:
          Ref: WebServerGroup
      EvaluationPeriods: '<%= @high_periods %>'
      MetricName: CPUUtilization
      Namespace: AWS/EC2
      Period: '60'
      Statistic: Average
      Threshold: '<%= @high_threshold %>'
    Type: AWS::CloudWatch::Alarm
  CPUAlarmLow:
    Properties:
      AlarmActions:
      - Ref: WebServerScaleDownPolicy
      AlarmDescription: Scale-down if CPU < <%= @low_threshold %>% for 10 minutes
      ComparisonOperator: LessThanThreshold
      Dimensions:
      - Name: AutoScalingGroupName
        Value:
          Ref: WebServerGroup
      EvaluationPeriods: '<%= @low_periods %>'
      MetricName: CPUUtilization
      Namespace: AWS/EC2
      Period: '60'
      Statistic: Average
      Threshold: '<%= @low_threshold %>'
    Type: AWS::CloudWatch::Alarm
<%= partial("host_record.yml.erb", domain: "mydomain.net") %>
  LaunchConfig:
    Properties:
      BlockDeviceMappings:
      - DeviceName: "/dev/sdb"
        VirtualName: ephemeral0
      ImageId: !Ref Ami
      InstanceType: !Ref InstanceType
      KeyName:
        Ref: KeyName
      SecurityGroups:
      - global
      - Fn::Join:
        - "-"
        - - Ref: Application
          - Ref: Environment
      - Ref: ServiceSecurityGroup
      UserData:
        Fn::Base64: !Sub | # No more Fn::Join needed
<%= partial("user_data/bootstrap.sh.erb", {}, indent: 10) %>
    Type: AWS::AutoScaling::LaunchConfiguration
  ServiceSecurityGroup:
    Properties:
      GroupDescription: Enable SSH access and HTTP from the load balancer only
      SecurityGroupIngress:
      - CidrIp: 0.0.0.0/0
        FromPort: '22'
        IpProtocol: tcp
        ToPort: '22'
      - FromPort:
          Ref: WebServerPort
        IpProtocol: tcp
        SourceSecurityGroupName:
          Fn::GetAtt:
          - elb
          - SourceSecurityGroup.GroupName
        SourceSecurityGroupOwnerId:
          Fn::GetAtt:
          - elb
          - SourceSecurityGroup.OwnerAlias
        ToPort:
          Ref: WebServerPort
    Type: AWS::EC2::SecurityGroup
  WebServerGroup:
    Properties:
      AvailabilityZones: !GetAZs ""
      HealthCheckGracePeriod: '300'
      HealthCheckType: ELB
      LaunchConfigurationName:
        Ref: LaunchConfig
      LoadBalancerNames:
      - Ref: elb
      MaxSize: '<%= @max_size %>'
      MinSize: '<%= @min_size %>'
    Type: AWS::AutoScaling::AutoScalingGroup
  WebServerScaleDownPolicy:
    Properties:
      AdjustmentType: ChangeInCapacity
      AutoScalingGroupName:
        Ref: WebServerGroup
      Cooldown: '120'
      ScalingAdjustment: "<%= @down_adjustment %>"
    Type: AWS::AutoScaling::ScalingPolicy
  WebServerScaleUpPolicy:
    Properties:
      AdjustmentType: ChangeInCapacity
      AutoScalingGroupName:
        Ref: WebServerGroup
      Cooldown: '120'
      ScalingAdjustment: '<%= @up_adjustment %>'
    Type: AWS::AutoScaling::ScalingPolicy
  elb:
    Properties:
      AvailabilityZones: !GetAZs ""
      HealthCheck:
        HealthyThreshold: '3'
        Interval: '6'
        Target:
          Fn::Join:
          - ''
          - - 'HTTP:'
            - Ref: WebServerPort
            - "/up/elb"
        Timeout: '5'
        UnhealthyThreshold: '5'
      Listeners:
      - InstancePort:
          Ref: WebServerPort
        LoadBalancerPort: '80'
        Protocol: HTTP
      <% if @ssl_cert %>
      - InstancePort:
          Ref: WebServerPort
        LoadBalancerPort: '443'
        PolicyNames: []
        Protocol: HTTPS
        SSLCertificateId: '<%= @ssl_cert %>'
      <% end %>
    Type: AWS::ElasticLoadBalancing::LoadBalancer