How can I approach setting up logging within my lambda function?

82    Asked by Chandralekhadebbie in AWS , Asked on Feb 13, 2024

 There is a scenario where I have deployed a serverless application by using the AWS Lambda function. In this particular scenario, u need to ensure that proper logging to troubleshoot any issues that may arise. How can I approach setting up logging within my lambda function, and what considerations should be taken into account so that I can ensure effective Monitoring and even debugging? 

Answered by Dhananjay Singh

 In the context of AWS, you can set up logging within AWS Lambda functions for the task of effective Monitoring and even debugging by using the following steps:-

Enable Cloud Watch logs

Try to configure that your lambda functions should send logs to Amazon cloud watch logs. This can be done by using any of two methods. The first one is the AWS management console and the second one is the AWS command line interface.

Import logging libraries

If you need more advanced logging capabilities or even want to log in to a specific piece of information within your lambda functions code, then you can try to import logging libraries such as “console” for Node.js, “logging” for Python programming language, or “logger” for java programming languages.

Define log levels

You can try to implement log levels within your lambda functioning coding for the task of categorizing log messages based on their severity. Here are some common logs given:- DEBUG, INFO, WARN, and ERROR.

Include context information

When you are trying to log into messages within your lambda function code, you can include context information such as the name of the function, invocation ID, request ID, and even timestamps.

Monitoring metrics

Try to set up Cloud Watch Alarms so that you can monitor specific metrics such as invocation errors, duration, and throttling for your specific functions related to lambda.

Here is a simplified example of how you can configure logging within a node.js lambda function:-

Const AWS = require(‘aws-sdk’);
Const logger = require(‘console’);
Exports.handler = async (event, context) => {
    Try {
        // Log an INFO message
        Logger.info(‘Lambda function invoked’, { event });
        // Perform function logic
        // Log a DEBUG message
        Logger.debug(‘Function logic executed successfully’);
        Return {
            statusCode: 200,
            body: JSON.stringify(‘Function executed successfully’)
        };
    } catch (error) {
        // Log an ERROR message
        Logger.error(‘An error occurred’, { error });
        Return {
            statusCode: 500,
            body: JSON.stringify(‘An error occurred’)
        };
    }
};

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