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Cloud Formation
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=> Cloud Formation service is used to provision infrastructure in AWS Cloud.

=> Cloud Formation works based on 'Infrastructure as a code' (IAAC)

=> Cloud Formation supports JSON and YML configurations

Note: If we create infrastructure manually it takes lot of time and it is error prone.


=> If we design cloud formation template to create Infrasture then we can re-use that template multiple times.


Note: Cloud Formation service works only in AWS Cloud.

Note: The alternate for 'Cloud Formation' service is 'TERRAFORM' tool. 


=> Terraform works with almost all cloud platforms available in the market.


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Creating EC2 instance using Cloud Formation
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=> Go to AWS Management Console and Navigate to 'Cloud Formation'

=> Click on Create Stack and upload below Template File


---------------------------- Ec2 - creation - using - yml - file -------------------------

Description:  Ashok IT - Build Linux Web Server
Parameters:
  LatestAmiId:
    Description: AMI Linux EC2 
    Type: 'AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>'
    Default: '/aws/service/ami-amazon-linux-latest/amzn2-ami-hvm-x86_64-gp2'
Resources:
  webserver1:
    Type: AWS::EC2::Instance
    Properties:
      InstanceType: "t2.micro"
      ImageId: !Ref LatestAmiId
      SecurityGroupIds: 
        - !Ref WebserverSecurityGroup
      Tags:
        - Key: Name
          Value: webserver1
      UserData:
        Fn::Base64: !Sub |
          #!/bin/bash -xe
          yum update -y
          yum install httpd -y
          service httpd start
          chkconfig httpd on
          cd /var/www/html
          echo "<br>" >> index.html
          echo "<h2><b>Ashok IT EC2 Linux Demo</b></h2>" >>index.html
  WebserverSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Enable Port 80
      Tags:
      - Key: Name
        Value: webserver-sg
      SecurityGroupIngress:
      - IpProtocol: tcp
        FromPort: 80
        ToPort: 80
        CidrIp: 0.0.0.0/0

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=> Verify EC2 dashboard, we can see EC2 instance created

=> Access EC2 VM public in browser.

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