AutoScaling ec2 instance with cloudformation - amazon-web-services

Question

I am trying to autoScale this ec2 instance please guide me how to do it. Any template that might be helpful so that I can get started with the autoscaling. I am attaching only ec2 instance template which I want to autoScale.
---
AWSTemplateFormatVersion: 2010-09-09
Parameters:
SourceStackName:
Description: "Source stack name"
Type: String
AllowedPattern: "^[a-zA-Z][-a-zA-Z0-9]*$"
Default: "shifa-vpc"
Resources:
webserver:
Type: AWS::EC2::SecurityGroup
Properties:
GroupName: webserver-sg
SecurityGroupIngress:
- IpProtocol: tcp
FromPort: 22
ToPort: 22
CidrIp: 0.0.0.0/0
Description: For traffic from Internet
- IpProtocol: tcp
FromPort: 80
ToPort: 80
CidrIp: 0.0.0.0/0
Description: For traffic from Internet
GroupDescription: Security Group for demo server
VpcId:
Fn::ImportValue:
Fn::Sub: "${SourceStackName}-VpcID"
EC2Instance:
Type: AWS::EC2::Instance
Properties:
AvailabilityZone: us-east-1a
BlockDeviceMappings:
- DeviceName: /dev/xvda
Ebs:
DeleteOnTermination: "true"
VolumeSize: "8"
VolumeType: gp2
ImageId: ami-09d95fab7fff3776c # ami-0bdcc6c05dec346bf
InstanceType: t2.micro
#IamInstanceProfile: !Ref ListS3BucketsInstanceProfile
#KeyName: ky-webserver
NetworkInterfaces:
- Description: Primary network interface
DeviceIndex: 0
SubnetId:
Fn::ImportValue:
Fn::Sub: "${SourceStackName}-PublicSubnet"
GroupSet:
- !Ref webserver
Outputs:
ec2:
Description: ec2
Value: !Ref EC2Instance
Export:
Name:
Fn::Sub: "${AWS::StackName}-server"
sgGroupId:
Description: ec2
Value: !GetAtt webserver.GroupId
Export:
Name:
Fn::Sub: "${AWS::StackName}-sgid"
I am new to cloudformation and I am in training.

Answer 1

Amazon have some examples for AutoScaling instances.
Importantly EC2 instance resources are not part of the autoscaling configuration within CloudFormation.
Instead you would use either a Launch Template or a Launch Configuration resource. The Launch Template is newer so preferably you should use this. These will define the instance configuration such as volumes, instance type etc.
The other component is the Autoscaling Group this will reference either one of previous components and define how the instance should scale.
If you're trying to scale an existing instance you will need to make an AMI from it first and the reference it.
AWS has an example template with autoscaling groups here.