Collecting Lambda logs via CloudWatch

In this topic, we are going to deploy a simple Python function in order to investigate logs via the CloudWatch service. Let’s do so step by step:

1. Create a Lambda function in AWS. In Chapter 3, where we covered Lambda, the basic steps of the Lambda deployment were explained. Hence, here, we will provide a summary of the Lambda steps. The name of the Lambda function is TestLogs:

Figure 7.1 – Creating a Lambda function

2. The Lambda function creates a basic template, like the following:

Figure 7.2 – The Lambda template

3. Copy the following code block to the handler:

   import json
   import os
   def lambda_handler(event, context):
       print('ENVIRONMENT VARIABLES')
       print(os.environ)
       return {
           'statusCode': 200,
     ...