13.7. Configuring AWS Lambda: Monitoring and Tracing Lambda Functions with CloudWatch
AWS Lambda is a serverless computing service that lets you run your code without provisioning or managing servers. It runs your code only when needed and automatically scales from a few requests per day to thousands per second. However, to ensure your code is working as expected and to deal with potential issues, you need to set up monitoring and tracing for your Lambda functions. One of the tools you can use for this is Amazon CloudWatch.
Introduction to Amazon CloudWatch
Amazon CloudWatch is a monitoring and observability service made for developers, operations engineers, IT professionals, and DevOps. It provides actionable data and insights to monitor your applications, understand and respond to changes in performance, optimize resource utilization, and gain a unified view of operational health.
Configuring CloudWatch for Lambda functions
By default, AWS Lambda automatically configures CloudWatch Logs for your Lambda functions. It places stream event logs and error logs for your Lambda functions into a CloudWatch log group. However, to get the most out of CloudWatch, you need to configure it to track specific metrics.
Step 1: Accessing CloudWatch
To access CloudWatch, you need to be logged into your AWS account. In the AWS console, navigate to the "Services" section and click "CloudWatch."
Step 2: Configuring metrics
In the left CloudWatch pane, click "Metrics". Here, you can see all the metrics that CloudWatch is tracking. To add a new metric, click "Create Metric". You will be prompted to select the metric namespace, metric name, and unit. For Lambda functions, the namespace will be "AWS/Lambda".
Step 3: Configuring alarms
Once you've set up your metrics, you can set up alarms to get notified when a metric reaches a certain threshold. In the left pane, click on "Alarms" and then "Create alarm". You will be prompted to select the metric you want to create the alarm for, set the alarm conditions, and configure the alarm actions.
Tracking Lambda Functions with CloudWatch
With CloudWatch configured, you can start tracking your Lambda functions. CloudWatch provides several metrics for Lambda functions, including invocations, errors, duration, and response time. You can view these metrics in the CloudWatch console.
Additionally, you can use CloudWatch Logs to view logs from your Lambda functions. Each Lambda function invocation generates a log record in CloudWatch Logs, which contains information about the invocation, including the date and time of the invocation, the duration of the invocation, and any error messages.
With monitoring and tracing set up, you can ensure your Lambda functions are working as expected and handle any issues that may arise. This is essential for effective backend development with AWS Lambda and API Gateway.
Conclusion
In summary, monitoring and tracking your Lambda functions with Amazon CloudWatch is an essential part of backend development with AWS Lambda. It allows you to understand how your functions are performing, identify problems and optimize resource utilization. By properly configuring CloudWatch, you can ensure your Lambda functions are always working at their best.
