Question $2$: $(80$ Marks$).$

You are asked to use Auto Scaling using the default VPC to automatically launch Amazon EC$2$ instances in response to conditions specified. Then, test the Auto Scaling by terminating two running instances and observe while Auto Scaling automatically creates replacement instances.

$2\mathrm{.}1$ Create a VPC Security Group called WebDMZ to permit access for web traffic via HTTP$.$

$2\mathrm{.}2$ Create an Auto Scaling group using the Launch Configuration. To create an Auto Scaling Groups, it will be a good idea to first create a Launch Configuration.

Create a Launch Configuration, and configure it as follows:

a$.$ Your instance must run amazon Linux $2$ AMI.

b$.$ Instance type: t$2.$micro.

c$.$ Name: MyASG$-$LG$.$

d$.$ Use the Boot Strap Scripts in the appendix.

e$.$ Use the default storage.

f$.$ Assign security group: Select an existing security group created in Question $2\mathrm{.}1.$

g$.$ Create and launch configuration with or without a key.

Create an Auto Scaling Groups, and configure it as follows:

a$.$ Name $=$ pracASG.

b$.$ Group size $=3.$

c$.$ Subnet $=$ Select three subnets.

d$.$ Scale your instances between $3$ and $6.$

e$.$ Scale group size:

Metric type $=$ Average CPU utilisation

Target value $=80$

Instances need $=60$ seconds

f$.$ Add tag: Name $=$ MyPracASG.

$2\mathrm{.}3$ Test your Auto Scaling by simulating instances failover.

Note: the minimum size for your Auto Scaling group is $3$ instances. Thus, if you simulate a failover by terminating two running instances, Auto Scaling must launch new instances to replace them.

NOTE: Ensure all configuration screenshots are in the final document.