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Getting Started with Amazon CloudWatch: Monitor EC2 and Detect Issues

Learn how Amazon CloudWatch helps monitor EC2 performance, configure CPU utilization alarms, and troubleshoot common AWS monitoring issues.

Running an application on AWS is not enough; monitoring its performance is equally important. For example, when an EC2 instance experiences high CPU utilization, an application may become slow. Amazon CloudWatch helps identify such situations through metrics, alarms, and logs.

How Does CloudWatch Work?

Amazon CloudWatch provides three useful capabilities:
  • Metrics: Monitor resource performance, such as CPU utilization.
  • Alarms: Detect when a metric crosses a defined threshold.
  • Logs: Help investigate application and system errors.

Practical Example: EC2 CPU Monitoring

Suppose a website runs on an EC2 instance. You want to receive an alert when CPU utilization remains above 80%.
  1. Open Amazon CloudWatch in the AWS Console.
  2. Navigate to Alarms and choose to create an alarm.
  3. Select the EC2 CPUUtilization metric for your instance.
  4. Set a threshold of 80% for two consecutive five-minute evaluation periods.
  5. Configure an Amazon SNS notification and confirm the email subscription.
  6. Create the alarm and monitor its state.
This configuration can alert you to sustained high CPU usage. However, high CPU utilization does not always mean the application has failed.

Common Troubleshooting Tips

  • No metric data: Verify the selected instance, metric, and monitoring configuration.
  • No email alert: Check whether the SNS email subscription is confirmed and correctly configured.
  • High CPU usage: Investigate application activity and compare metrics with normal usage.
  • Slow application with low CPU: Check logs, network performance, storage, and dependent services.

Conclusion

Amazon CloudWatch helps cloud operators monitor AWS resources and identify potential issues before they become bigger problems. Starting with a simple EC2 CPU alarm is an effective way for beginners to understand cloud monitoring and build essential CloudOps skills.
Learn more: https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/WhatIsCloudWatch.html 
# aws-cloudwatch# amazon-ec2
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