AWS Cloudformation is a service that helps us initiate aws resources using json or yaml files. It’s know as IaaS (Infrastructure As A Service).

Structure of the Document

  • AWS Template Format Version: It contains the version of the file.
  • Description: It basically the description of what the script will do written by the owner of the script. It’s a string field.
  • MetaData: This contains the properties of the templates.
  • Parameters: Any values we pass to the templates
  • Mappings: Dependencies between our AWS resources.
  • Conditions: we add these when stack is being created.
  • Outputs: The outputs are the ones displayed when are stack is created.
  • Resources: The AWS Resources we need to initiate. (The most important part)

Example CloudFormation.

A simple CloudFormation script that initiates EC2 instances with SSH

  "Description": "Create an EC2 instance by AWS CloudFormation",
  "Resources": {
    "SecurityGroupDemoSvrTraffic": {
      "Type": "AWS::EC2::SecurityGroup",
      "Properties": {
        "GroupName": "ssh-group",
        "SecurityGroupIngress": [
            "IpProtocol": "tcp",
            "FromPort": 22,
            "ToPort": 22,
            "CidrIp": "",
            "Description": "For traffic from Internet"
        "GroupDescription": "Security Group for demo server",
        "VpcId": "[Find you VpcId in VPC-->Subnets]"
    "EC2InstanceDemoSvr": {
      "Type": "AWS::EC2::Instance",
      "Properties": {
        "AvailabilityZone": "[Find you AvailabilityZone in VPC-->Subnets]",
        "ImageId": "[Find your ImageId in EC2-->Launch Instance-->Step1]",
        "InstanceType": "[Find your InstanceType in EC2-->Launch Instance-->Step2]",
        "KeyName": "[Find your KeyName in EC2-->Key Pairs]",

Starting Windows Machine using CloudFormation

Description: "A simple script that starts Window EC2 instances on AWS Cloud"
    Type: "AWS::EC2::Instance"
        - !Ref InstanceGroupSecurity
      InstanceType: # t1.micro
      KeyName: # Your key
      ImageId: ""
    Type: "AWS::EC2::SecurityGroup"
      GroupDescription: '' # Description
        - IpProtocol: # Enter Protocol Like TCP
          FromPort: # RDP Port
          ToPort: 3389