wait-condition

AWSTemplateFormatVersion: '2010-09-09'
Description: 'Built in HAProxy server'
Outputs:
  PublicIp:
    Description: 'instance IP'
    Value:
      Fn::GetAtt:
      - 'LB_instance'
      - 'PublicIp'
Parameters:
  KeyName:
    Type: 'String'
Resources:
  CfnLBAccessKey:
    Properties:
      UserName:
        Ref: 'CfnLBUser'
    Type: 'AWS::IAM::AccessKey'
  CfnLBUser:
    Type: 'AWS::IAM::User'
  LB_instance:
    Metadata:
      AWS::CloudFormation::Init:
        config:
          files:
            /etc/cfn/cfn-credentials:
              content:
                Fn::Join:
                - ''
                - - 'AWSAccessKeyId='
                  - Ref: 'CfnLBAccessKey'
                  - '

                    '
                  - 'AWSSecretKey='
                  - Fn::GetAtt:
                    - 'CfnLBAccessKey'
                    - 'SecretAccessKey'
                  - '

                    '
              group: 'root'
              mode: '000400'
              owner: 'root'
            /etc/cfn/cfn-hup.conf:
              content:
                Fn::Join:
                - ''
                - - '[main]

                    '
                  - 'stack='
                  - Ref: 'AWS::StackId'
                  - '

                    '
                  - 'credential-file=/etc/cfn/cfn-credentials

                    '
                  - 'region='
                  - Ref: 'AWS::Region'
                  - '

                    '
                  - 'interval=60

                    '
              group: 'root'
              mode: '000400'
              owner: 'root'
            /etc/cfn/hooks.conf:
              content:
                Fn::Join:
                - ''
                - - '[cfn-init]

                    '
                  - 'triggers=post.update

                    '
                  - 'path=Resources.LB_instance.Metadata

                    '
                  - 'action=/opt/aws/bin/cfn-init -s '
                  - Ref: 'AWS::StackId'
                  - '    -r LB_instance '
                  - '    --region '
                  - Ref: 'AWS::Region'
                  - '

                    '
                  - 'runas=root

                    '
                  - '

                    '
                  - '[reload]

                    '
                  - 'triggers=post.update

                    '
                  - 'path=Resources.LB_instance.Metadata

                    '
                  - 'action=reload haproxy

                    '
                  - 'runas=root

                    '
              group: 'root'
              mode: '000400'
              owner: 'root'
            /etc/haproxy/haproxy.cfg:
              content: ''
              group: 'root'
              mode: '000644'
              owner: 'root'
            /tmp/cfn-hup-crontab.txt:
              content:
                Fn::Join:
                - ''
                - - 'MAIL=""

                    '
                  - '

                    '
                  - '* * * * * /opt/aws/bin/cfn-hup -f

                    '
                  - '* * * * * /opt/aws/bin/cfn-push-stats '
                  - ' --watch '
                  - Ref: 'latency_watcher'
                  - ' --haproxy

                    '
              group: 'root'
              mode: '000600'
              owner: 'root'
          packages:
            debian:
              haproxy: []
              python-psutil: []
              socat: []
    Properties:
      ImageId: 'a84903e8-1b4e-45e8-ad4a-886fae9393a3'
      InstanceType: 'm1.small'
      KeyName:
        Ref: 'KeyName'
      UserData:
        Fn::Base64:
          Fn::Join:
          - ''
          - - '#!/bin/bash -v

              '
            - '# Helper function

              '
            - 'function error_exit

              '
            - '{

              '
            - '  /opt/aws/bin/cfn-signal -e 1 -r "$1" '''
            - Ref: 'WaitHandle'
            - '''

              '
            - '  exit 1

              '
            - '}

              '
            - '/opt/aws/bin/cfn-init -s '
            - Ref: 'AWS::StackId'
            - '    -r LB_instance '
            - '    --region '
            - Ref: 'AWS::Region'
            - '

              '
            - '# install cfn-hup crontab

              '
            - 'crontab /tmp/cfn-hup-crontab.txt

              '
            - '# LB setup completed, signal success

              '
            - '/opt/aws/bin/cfn-signal -e 0 -r "LB server setup complete"
              '''
            - Ref: 'WaitHandle'
            - '''

              '
    Type: 'AWS::EC2::Instance'
  WaitCondition:
    DependsOn: 'LB_instance'
    Properties:
      Handle:
        Ref: 'WaitHandle'
      Timeout: '600'
    Type: 'AWS::CloudFormation::WaitCondition'
  WaitHandle:
    Type: 'AWS::CloudFormation::WaitConditionHandle'
  latency_watcher:
    Properties:
      AlarmActions: []
      ComparisonOperator: 'GreaterThanThreshold'
      EvaluationPeriods: '1'
      MetricName: 'Latency'
      Namespace: 'AWS/ELB'
      Period: '60'
      Statistic: 'Average'
      Threshold: '2'
    Type: 'AWS::CloudWatch::Alarm'