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How to Test a CloudWatch Alarm by Intentionally Increasing the CPU Load on an EC2 Instance to Verify that the Alarm Triggers Correctly?

 Alarm Triggers

Condition for Test a CloudWatch Alarm by Intentionally Increasing the CPU Load on an EC2 Instance to Verify that the Alarm Triggers Correctly

  • Description:
    This activity verifies that the alerting mechanism responds correctly when system utilization rises above the defined threshold.The process begins by connecting to the compute environment and preparing it to generate additional workload.A load-generation utility is installed and executed, causing the processing activity to rise significantly for a short duration.As the resource demand increases, the monitoring system detects the elevated usage.Once the defined limit is crossed, the previously configured alert becomes active.A notification is automatically delivered to the designated recipient, indicating that the threshold has been exceeded.After a brief evaluation period, the monitoring dashboard reflects the updated alert status.This confirms that both the alert rule and the notification channel are functioning as expected.

Steps

  •  Step 1: Login to EC2
     ssh -i key.pem ec2-user@your-public-ip
  •  Step 2: Install stress tool
     sudo yum install stress -y
  •  Step 3: Run CPU stress
     stress --cpu 2 --timeout 300
     This pushes CPU high → CloudWatch triggers alarm → You get an email
  •  Step 4: Check CloudWatch Alarm status
     Check CloudWatch Alarm status → It will change to ALARM
  •  Step 5: Result
     Within 1–2 minutes:
     CloudWatch Alarm state → ALARM
     SNS sends email
     The receive mail like:
     ALARM: "High-CPU-EC2-Alert"
     Reason: Threshold Crossed: 1 out of last 1 datapoints greater than 70.0
     InstanceId: i-04fe8e56059c7c38e
     Time: 2025-xx-xx
     Region: eu-north-1
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