Create an AWS Lambda function from scratch
In this quick lesson we're going to learn how to create a brand new AWS Lambda function from scratch and show how to test the execution of a 'hello world' Lambda function
Tomasz Lakomy: [0:00] First login to your Amazon Web Services account. Afterwards, go to Services, and you can find Lambda under Compute, or you can also search for it over here, lambda.
[0:10] Before we can create a lambda function, we have to make sure that we are in the correct region. AWS Lambda is not a global service, so for instance, I'm based in Europe, so I'm going to create my functions in Europe, that is in Frankfurt.
[0:22] For instance, if you were based in US, you probably want to select one of those regions in order to declare your function in, because it's going to be probably closer to your users. Next, click on Create function.
[0:32] There are a number of options for us to choose, we can create our function from scratch, but we can also use a blueprint or deploy entire application from the AWS Serverless Application Repository. If you have a common use case, it's probably worth taking a look into some of those, because your problem may already be solved by the community, but we're going to create our function from scratch.
[0:51] I'm going to call my function, myFunction, and we're going to use Node.js 12.x. As you can see, there are also a number of other languages we could use.
[1:00] I'm going to click on Create function. Now, we have created our first lambda function.
[1:04] If we scroll down, we're going to see the sample code provided by the AWS. Whenever this function is going to be executed, we're going to return a following response, "statusCode of 200," which means, "HTTP OK," and the body is basically, going to be the string, "Hello from Lambda!" In order to test if this function works, click on Test.
[1:23] Here we can create a test event. Currently, we don't care about what is going to be provided to this function, so we're going to leave everything as default. I'm going to create my event name as "test." Create it.
[1:35] Afterwards, after I click Test, now I can see that my function has executed successfully. After I click on Details, I'm going to see the response, which we specified earlier. So, "statusCode of 200" and body, "Hello from Lambda!"