2_cfn-hup.yml

AWSTemplateFormatVersion: "2010-09-09"
Description: Cfn Helper Script Sample
Parameters:
  VpcId:
    Type: 'AWS::EC2::VPC::Id'
    Description: Your default VPC Id
  SubnetId:
    Type: 'AWS::EC2::Subnet::Id'
    Description: SubnetId in your default VPC
  KeyName:
    Type: 'AWS::EC2::KeyPair::KeyName'
    Description: Name of an existing EC2 KeyPair to enable SSH access to the instances
  FromIpAddress:
    Type: String
    Description: The IP address range that can be used to SSH and HTTP to the EC2 instances
    Default: 0.0.0.0/0
  AmiId:
    Description: AMI Id
    Type: String
    Default: ami-0a1c2ec61571737db
Resources:
  ServerInstance:
    Type: AWS::EC2::Instance
    Metadata:
      Comment: Install a simple web app
      AWS::CloudFormation::Init:
        config:
          packages:
            yum:
              httpd: []
          files:
            /var/www/html/index.html:
              content: !Sub |
                <p>Hello!</p>
              mode: '000644'
              owner: root
              group: root
            /etc/cfn/cfn-hup.conf:
              content: !Sub |
                [main]
                stack=${AWS::StackName}
                region=${AWS::Region}
                interval=1
              mode: '000400'
              owner: root
              group: root
            /etc/cfn/hooks.d/cfn-auto-reloader.conf:
              content: !Sub |
                [cfn-auto-reloader-hook]
                triggers=post.update
                path=Resources.ServerInstance.Metadata.AWS::CloudFormation::Init
                action=/opt/aws/bin/cfn-init -v \
                  --stack  ${AWS::StackName} \
                  --resource ServerInstance \
                  --region ${AWS::Region}
                runas=root
          services:
            sysvinit:
              httpd:
                enabled: 'true'
                ensureRunning: 'true'
              cfn-hup:
                enabled: 'true'
                ensureRunning: 'true'
                files:
                  - /etc/cfn/cfn-hup.conf
                  - /etc/cfn/hooks.d/cfn-auto-reloader.conf
    Properties:
      ImageId: !Ref AmiId
      InstanceType: t3.micro
      SecurityGroupIds:
        - !Ref InstanceSecurityGroup
      KeyName: !Ref KeyName
      SubnetId : !Ref SubnetId
      UserData:
        Fn::Base64: !Sub |
          #!/bin/bash -xe
          /opt/aws/bin/cfn-init -v \
          --stack ${AWS::StackName} \
          --resource ServerInstance \
          --region ${AWS::Region}
  InstanceSecurityGroup:
    Type: 'AWS::EC2::SecurityGroup'
    Properties:
      GroupDescription: Enable SSH access and HTTP access on the inbound port
      SecurityGroupIngress:
        -
          IpProtocol: tcp
          FromPort: 22
          ToPort: 22
          CidrIp: !Ref FromIpAddress
        -
          IpProtocol: tcp
          FromPort: 80
          ToPort: 80
          CidrIp: !Ref FromIpAddress
      VpcId: !Ref VpcId