📖 What is Amazon CloudWatch?
Amazon CloudWatch is a monitoring and observability service providing metrics, logs, and alarms for AWS resources and applications. It enables real-time monitoring of performance, resource utilization, and operational health, facilitating proactive identification and resolution of issues within the AWS environment.
"CloudWatch collects and tracks metrics, which can be used to create alarms. Understand the distinction between CloudWatch Metrics, Logs, and Events. CloudTrail records API calls; CloudWatch monitors resource performance. Exam questions frequently test this differentiation."
📚 Certification: AWS Certified Cloud Practitioner (CLF-C02)
🔑 What are the Key Concepts of Amazon CloudWatch?
- ▸ CloudWatch Metrics collect numerical data points about AWS resources and applications, providing insights into performance and health.
- ▸ CloudWatch Logs allow you to centralize, monitor, and analyze log data generated by various sources, aiding in troubleshooting.
- ▸ CloudWatch Alarms automatically trigger actions based on defined thresholds for metrics, enabling proactive issue response.
- ▸ CloudWatch Dashboards provide customizable visualizations of metrics and logs, offering a consolidated view of your AWS environment.
- ▸ CloudWatch Events (now EventBridge) reacts to changes in AWS resources and can trigger actions, automating operational tasks.
🎯 How does Amazon CloudWatch appear on the CLF-C02 Exam?
You may be asked to identify the CloudWatch feature used to automatically scale EC2 instances based on CPU utilization exceeding a certain threshold.
A scenario might describe a need to track the number of 4xx errors returned by an Application Load Balancer – determine which CloudWatch metric is most relevant.
Expect questions about configuring a CloudWatch Alarm to send an SNS notification when disk space on an EC2 instance reaches 80% capacity.
❓ Frequently Asked Questions
What's the difference between CloudWatch Metrics and CloudWatch Logs?
Metrics are numerical data points, like CPU utilization, while Logs are text-based event data, like application logs. Metrics are graphed; Logs are searched and analyzed. Both are crucial for monitoring.
Can CloudWatch monitor on-premises servers?
Yes, using the CloudWatch Agent, you can install it on on-premises servers to collect metrics and logs and send them to CloudWatch for centralized monitoring and analysis.
How does CloudWatch integrate with other AWS services like Lambda?
CloudWatch can be triggered by events from services like Lambda. Lambda functions can also send custom metrics and logs directly to CloudWatch for monitoring and debugging purposes.