webapp-autoscaling-appserver.yaml

# Note, the development environment will only spin a min of 1 instance (Not HA Support)
# The production environment will spin a min of 2 instance (HA support)
# You can adjust the ASMIN, ASMAX, ASDES at the master.yml file
# to meet your instances spin numbers.
#
---
AWSTemplateFormatVersion: "2010-09-09"
Description: >
    This template deploys an AutoScaling Launch Config and Group

Parameters: 

  PMServerEnv:
    Description: "Server Environment name."
    ConstraintDescription: "Choose an Environment from the drop down"
    Type: "String"
    AllowedValues: 
      - "dev"
      - "staging"
      - "prod"

  PMKeyName:
    Description: "Enter an existing EC2 KeyPair. Default is MyEC2Key"
    Type: "String"

  PMInstanceType: 
    Description: "Enter t2.micro or m1.small. Default is t2.micro."
    Type: "String"
    AllowedValues: 
      - "t2.micro"
      - "m1.small"

  PMPrivateSubnets:
    Description: "Subnets to launch instances into"
    Type: "List<AWS::EC2::Subnet::Id>"

  PMAPPHostSG:
    Description: "Select the Security Group to use for the EC2 hosts"
    Type: "AWS::EC2::SecurityGroup::Id"

  PMWEBDOMAIN:
    Description: "A reference to the Application domain name"
    Type: "String"

  PMAPPLoadBalancer:
    Description: "A reference to the Application Load Balancer"
    Type: "String"

  PMIAMS3CWInstanceProfile:
    Description: "A reference to the IamInstanceProfile"
    Type: "String"

  PMRegionAMI:
    Description: "A reference to the Region AMI"
    Type: "String"

  PMASMIN:
    Description: "A reference to the MinSize"
    Type: "String"

  PMASMAX:
    Description: "A reference to the MaxSize"
    Type: "String"

  PMASDES:
    Description: "A reference to the DesiredCapacity"
    Type: "String"


####### Resources Setup #######
Resources:

  # Auto Scaling Launch Configuration
  LaunchConfiguration:
    Type: "AWS::AutoScaling::LaunchConfiguration"
    Properties:
      AssociatePublicIpAddress: "false"
      KeyName:
        Ref: "PMKeyName"
      ImageId: 
        Ref: "PMRegionAMI"
      InstanceType:
        Ref: "PMInstanceType"
      IamInstanceProfile:
        Ref: "PMIAMS3CWInstanceProfile"
      SecurityGroups:
      - Ref: "PMAPPHostSG"
      UserData:
        Fn::Base64: !Sub |
          #!/bin/bash -xe
          yum update -y aws-cfn-bootstrap
          yum update -y
          yum install htop php-fpm php-gd php-mcrypt php-mysql php-xmlrpc php-cli php-devel telnet git awslogs python-pip aws-cfn-bootstrap nginx -y
          yum remove nginx -y

          echo "[plugins]
          cwlogs = cwlogs
          [default]
          region = ${AWS::Region}" > /etc/awslogs/awscli.conf
          service awslogs start
          chkconfig awslogs on

          mkdir -p /home/www/public_html/${PMWEBDOMAIN}
          echo "This is App Server <br> <?php phpinfo(); ?>" > /home/www/public_html/${PMWEBDOMAIN}/index.php
          chown -R nginx:nginx /home/www/public_html/${PMWEBDOMAIN}
          chmod -R +x /home/www/public_html/${PMWEBDOMAIN}

          sed -ie 's/127.0.0.1:9000/9000/g' /etc/php-fpm.d/www.conf
          sed -ie 's/listen.allowed_clients/;listen.allowed_clients/g' /etc/php-fpm.d/www.conf
          sed -ie 's/user = apache/user = nginx/g' /etc/php-fpm.d/www.conf
          sed -ie 's/group = apache/group = nginx/g' /etc/php-fpm.d/www.conf

          chkconfig php-fpm on
          service php-fpm start

          /opt/aws/bin/cfn-signal -e 0 -r 'server setup complete' "${WaitHandleAPP}"  > /tmp/userdata.log

  WaitHandleAPP:
    Type: "AWS::CloudFormation::WaitConditionHandle"

  WaitCondition:
    Type: "AWS::CloudFormation::WaitCondition"
    Properties:
      Handle: !Ref "WaitHandleAPP"
      Timeout: '600'

  # Auto Scaling Group Basic Setup
  AppScalingGroup: 
    Type: "AWS::AutoScaling::AutoScalingGroup"
    Properties:
      MinSize: !Ref "PMASMIN"
      MaxSize: !Ref "PMASMAX"
      DesiredCapacity: !Ref "PMASDES"
      LaunchConfigurationName:
        Ref: "LaunchConfiguration"
      VPCZoneIdentifier: !Ref "PMPrivateSubnets"
      LoadBalancerNames:
      - Ref: "PMAPPLoadBalancer"
      HealthCheckGracePeriod: "300"
      HealthCheckType: "ELB"
      Tags:
      - Key: "Name"
        Value: !Sub "${PMServerEnv}-APPserver"
        PropagateAtLaunch: 'true'

  # Auto ScalingUp Policy - Basic Setup
  APPServerScaleUpPolicy:
    Type: "AWS::AutoScaling::ScalingPolicy"
    Properties:
      AdjustmentType: "ChangeInCapacity"
      AutoScalingGroupName:
        Ref: "AppScalingGroup"
      Cooldown: '300'
      ScalingAdjustment: '1'

  # Auto ScalingDown Policy - Basic Setup
  APPServerScaleDownPolicy:
    Type: "AWS::AutoScaling::ScalingPolicy"
    Properties:
      AdjustmentType: "ChangeInCapacity"
      AutoScalingGroupName:
        Ref: "AppScalingGroup"
      Cooldown: '300'
      ScalingAdjustment: '-1'
      

Outputs:

  AppScalingGroup: 
    Description: "Auto Scaling Group Reference ID"
    Value: !Ref "AppScalingGroup"

  APPServerScaleUpPolicy: 
    Description: "Auto Scaling Up Policy Reference ID"
    Value: !Ref "APPServerScaleUpPolicy"

  APPServerScaleDownPolicy: 
    Description: "Auto Scaling Down Policy Reference ID"
    Value: !Ref "APPServerScaleDownPolicy"