Parameters:
   MyKeyPair:
      Description: Select the Key Pair you wish to use for these instances.
      Type: AWS::EC2::KeyPair::KeyName
      # Optional, but handy
      Default: MyDefaultKeyPair
Resources:
   # Define the Security Group
   MySecurityGroupId:
      Type: AWS::EC2::SecurityGroup
      Properties:
         GroupName: My Security Group Name
         GroupDescription: My Security Group Description
         SecurityGroupIngress:
         -  IpProtocol: icmp
            FromPort: -1
            ToPort: -1
            CidrIp: 0.0.0.0/0
         -  IpProtocol: tcp
            FromPort: 22
            ToPort: 22
            CidrIp: 0.0.0.0/0
         -  IpProtocol: tcp
            FromPort: 80
            ToPort: 80
            CidrIp: 0.0.0.0/0
         Tags:
         -  Key: Name
            Value: My CF Security Group

   # Define the EC2 Instance
   MyEc2Instance:
      Type: AWS::EC2::Instance
      Properties:
         ImageId: ami-710e2414
         InstanceType: t2.micro
         # Optional, but required if you want to actually access it.
         KeyName: !Ref MyKeyPair
         # Use the Security Group created above
         SecurityGroups:
            -  !Ref MySecurityGroupId
         Tags:
            -  Key: Name
               Value: My EC2 Instance   

         # These lines initialize the use of ::Init.  Init will not function without them.
         UserData:
            Fn::Base64: !Sub |
               #!/bin/bash -xe
               /opt/aws/bin/cfn-init -s ${AWS::StackId} -r MyEc2Instance --region ${AWS::Region} || error_exit 'Failed to run cfn-init'

      # Add the Metadata commands to install Apache and PHP
      # Notice this section is outside of the Properties section.
      Metadata:
         AWS::CloudFormation::Init:
            config:
               # Install Apache and PHP at their current versions
               packages:
                  yum:
                     httpd: []
                     php: []
               # Start Apache and configure to restart at reboot
               services:
                  sysvinit:
                     httpd:
                        enabled: true
                        ensureRunning: true
               files:
                  "/var/www/html/index.php":
                     content: !Sub |
                        <h1>Hello!</h1>
                        I'm glad you made it!<br/>
                        You just created a Cloud Formation stack called: ${AWS::StackName}!<br/>
                        <?php phpinfo(); ?>
                     mode: '000400'
                     owner: apache
                     group: apache