#CloudFormation

PointsToNote:

1. When creating non-default VPC , we cannot add securitygroup in instance resource , instead should use securitygroupId .

   • use function to extract security ID(attributes ) that being created in template . MyInstance: Type: AWS::EC2::Instance Properties: AvailabilityZone: us-east-1a ImageId: ami-a4c7edb2 #YourPreferedImage InstanceType: t2.micro #YourPreferedInstancesType SecurityGroupIds:
     • !GetAtt SSHSecurityGroup.GroupId SubnetId: !Ref Subnet1 KeyName: 'mupair' MyVPC: Type: AWS::EC2::VPC Properties: CidrBlock: "10.0.0.0/16" VPCInternetAttachment: Type: AWS::EC2::VPCGatewayAttachment Properties: VpcId: !Ref MyVPC InternetGatewayId: !Ref InternetGateway InternetGateway: Type: AWS::EC2::InternetGateway

2. we Cannot modify main/default route table entry from Cloudformation template .

   • use 'subnetroutetableassociation' to create a route table for that subnet that is reference with VPC created.

myRouteTable: Type: AWS::EC2::RouteTable Properties: VpcId: Ref: MyVPC Myroute: Type: AWS::EC2::Route

Properties:
  DestinationCidrBlock: "0.0.0.0/0"
  GatewayId: !Ref InternetGateway
  RouteTableId: !Ref myRouteTable

SubnetRouteTableAssociation: Type: AWS::EC2::SubnetRouteTableAssociation Properties: SubnetId: !Ref Subnet1 RouteTableId: !Ref myRouteTable

3. ##########AutoScaling Config with CPU traking Policy#############

Scaling: Type: AWS::AutoScaling::AutoScalingGroup Condition: CreateProdResources Properties: AvailabilityZones: - 'us-east-1a' InstanceId: !Ref MyInstance MaxSize: '5' MinSize: '1' DesiredCapacity: '2' MetricsCollection: - Granularity: 1Minute

ScalingPolicy: Type: AWS::AutoScaling::ScalingPolicy Properties: AutoScalingGroupName: !Ref Scaling PolicyType: 'TargetTrackingScaling' TargetTrackingConfiguration: PredefinedMetricSpecification: PredefinedMetricType: ASGAverageCPUUtilization TargetValue: 50

4. NONAlphanumeric Reource Name are not Supported.

5. Always check aws cloudformation Documentations for resource and attributes