Built ASG based Architecture

In this guide, you’ll deploy a simple AWS architecture using the Management Console to kick off an introduction to the AWS Fault Injection Service (FIS). We’ll create three components:

1. EC2 Launch Template tagged for our experiment
2. Auto Scaling Group (ASG) spanning two Availability Zones
3. CloudWatch Log Group for FIS experiment logs

1. Create an EC2 Launch Template

An EC2 Launch Template defines the configuration (AMI, instance type, security groups, tags) that the ASG will use to provision EC2 instances.

1. Open the EC2 console and navigate to Launch Templates.
2. Click Create launch template.
3. Enter the following details:
   • Launch template name: FIS-Experiment-Template
   • Template version description: Initial version for FIS experiment
   • Tags:
     • Key: experiment
     • Value: fault-injection
   • Choose your AMI, Instance Type, Key Pair, Security Groups, etc.
4. Review and click Create launch template.

For more information, see the AWS documentation on EC2 Launch Templates.

2. Configure the Auto Scaling Group

Your Auto Scaling Group will maintain a desired capacity of 1 instance (minimum 1, maximum 4) across two Availability Zones. If an instance terminates, the ASG will automatically launch a replacement to maintain the desired capacity.

Steps

1. In the EC2 console, go to Auto Scaling Groups → Create Auto Scaling group.
2. Select Launch template and choose FIS-Experiment-Template.
3. Select two subnets in different Availability Zones.
4. Under Configure group size and scaling policies, set the capacity values as shown above.
5. (Optional) Add scaling policies if you want the group to scale based on metrics.
6. Review and click Create Auto Scaling group.

3. Create a CloudWatch Log Group

AWS FIS will publish all experiment activity to CloudWatch Logs. Create a dedicated log group named FIS-Experiment.

1. Open the CloudWatch console and select Logs → Log groups.
2. Click Create log group.
3. Enter Log group name: FIS-Experiment
4. (Optional) Configure a retention policy (e.g., 30 days).
5. Click Create.

For more details, refer to the Amazon CloudWatch Logs documentation.

With these three components in place—EC2 Launch Template, Auto Scaling Group, and CloudWatch Log Group—you’re ready to begin your AWS Fault Injection Service experiment. In the next section, we’ll configure and execute an FIS experiment against this architecture.