🤔 Task 1 - Implement autoscaling on memory utilization

Scenario:

Implement autoscaling on memory utilization trigger notification each time instance scale up and scale down with sns

Implementing Autoscaling on Memory Utilization with SNS Notifications Understanding the Components:

1. AWS Auto Scaling Group (ASG): Manages a group of EC2 instances, automatically scaling them up or down based on predefined policies.
2. Amazon CloudWatch: Monitors various metrics, including memory utilization, from your EC2 instances.
3. Amazon SNS: A messaging service to send notifications to subscribed endpoints (e.g., email, SMS, or other AWS services).

Step 1: Create an SNS Topic

• Navigate to the SNS console.
• Create a new topic.
• Give it a descriptive name (e.g., “AutoScalingNotifications”).

Step 2: Create an Auto Scaling Group

• Navigate to the EC2 console and select “Auto Scaling Groups”.
• Create a new Auto Scaling group with the desired configuration:
  • Launch Configuration: Specify the AMI, instance type, security groups, etc.
  • Scaling Policies:
    • Scaling Adjustment Policy: Define the scaling adjustment (e.g., add or remove instances) based on specific conditions.
    • Target Tracking Scaling Policy: Set a target value for a specific metric (e.g., memory utilization) and let the ASG automatically adjust the number of instances to maintain that target.

Created Launch Template with this User data

#!/bin/bash
yum install nginx unzip -y
systemctl enable --now nginx
curl -O [https://www.free-css.com/assets/files/free-css-templates/download/page296/oxer.zip](https://www.free-css.com/assets/files/free-css-templates/download/page296/oxer.zip)
unzip oxer.zip
rm oxer.zip
mv oxer* /usr/share/nginx/html
systemctl restart nginx

enable sns notification and select previously created sns topic

Step 3: Configure CloudWatch Alarms

• Navigate to the CloudWatch console. - Create an alarm for the “MemoryUtilization” metric:

  • Metric Name: MemoryUtilization
  • Namespace: AWS/EC2
  • Statistic: Average
  • Period: 5 Minutes (or as needed)
  • Threshold: Set the desired threshold (e.g., 80%)
  • Comparison Operator: Greater Than or Equal To
  • Alarm Actions: Select the SNS topic created in step 1.

• Associate the Alarm with the Auto Scaling Group:

  • In the Auto Scaling group settings, under “Notifications,” add the CloudWatch alarm created in step 3.

Create Alarm

select memory utilization metric