13. How to configure AWS Lambda

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AWS Lambda is a compute service that lets you run code without provisioning or managing servers. AWS Lambda runs your code only when needed and automatically scales from a few requests per day to thousands per second. Let's discuss how to configure AWS Lambda for backend development using Python.

Step 1: Set up an AWS account

To get started, you need to create an AWS account if you don't already have one. Once created, log in to your account and access the AWS Management Console. In the search bar, type 'Lambda' and click on the 'Lambda' service that appears in the search results.

Step 2: Create a Lambda function

After signing in to the AWS Lambda dashboard, click on the 'Create function' button. You will be taken to a new page where you can configure your role. Give your role a name, choose 'Python' as your runtime, and then choose or create a new IAM role with the appropriate permissions.

Step 3: Configure the Lambda function

After creating your role, you will be taken to the role configuration page. Here, you can see various configuration options. In the 'Function Code' section, you can write your Python code directly in the built-in code editor, or you can upload a ZIP file or an archive from an Amazon S3 bucket.

Step 4: Configure the trigger

Triggers are what make your function execute. You can configure multiple triggers for your function, such as a file upload event to S3, a change to a DynamoDB table, an HTTP request through API Gateway, and more. To configure a trigger, click the '+Add trigger' button and choose the type of trigger you want to add.

Step 5: Configure the API Gateway

To configure API Gateway as a trigger, choose 'API Gateway' from the list of triggers. You will then be taken to a new page where you can configure your API Gateway. You can choose to create a new API or use an existing one. You can also choose the type of security you want for your API.

Step 6: Test the Lambda function

After configuring your function and trigger, you can test your function by clicking the 'Test' button. You will be prompted to configure a test event, which is what will trigger your function. After configuring and saving your test event, click 'Test' again to run your function.

Step 7: Monitor the Lambda function

AWS Lambda provides monitoring tools that let you see real-time metrics for your functions. You can see the number of times your function was executed, the execution duration, the number of errors, among other metrics. You can access these metrics in the 'Monitoring' section of the role configuration page.

In summary, AWS Lambda is a powerful tool for backend development, especially when combined with Python. The ability to run code without needing to manage servers, along with automatic scaling, makes AWS Lambda an attractive option for many developers.

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4213.1. How to Configure AWS Lambda: Introduction to AWS Lambda