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