Create a Lambda@Edge function

To set up AWS Lambda to run Lambda functions that are based on CloudFront events, follow this procedure.

To create a Lambda@Edge function

1. Sign in to the AWS Management Console and open the AWS Lambda console at https://console.aws.amazon.com/lambda/.

2. If you already have one or more Lambda functions, choose Create function.

   If you've don't have any functions, choose Get Started Now.

3. In the Region list at the top of the page, choose US East (N. Virginia).

4. Create a function using your own code or create a function starting with a CloudFront blueprint.

   • To create a function using your own code, choose Author from scratch.

   • To display a list of blueprints for CloudFront, enter cloudfront in the filter field, and then choose Enter.

     If you find a blueprint that you want to use, choose the name of the blueprint.

5. In the Basic information section, specify the following values:

   1. Name – Enter a name for your function.

   2. Role – To get started quickly, choose Create new role from template(s). You can also choose Choose an existing role or Create a custom role, and then follow the prompts to complete the information for this section.

   3. Role name – Enter a name for the role.

   4. Policy templates – Choose Basic Edge Lambda permissions.

6. If you chose Author from scratch in step 4, skip to step 7.

   If you chose a blueprint in step 4, the cloudfront section lets you create one trigger, which associates this function with a cache in a CloudFront distribution and a CloudFront event. We recommend that you choose Remove at this point, so there isn't a trigger for the function when it's created. Then you can add triggers later.

   Tip

   We recommend that you test and debug the function before adding triggers. If you add a trigger now, the function will run as soon as you create the function and it finishes replicating to AWS locations around the world, and the corresponding distribution is deployed.

7. Choose Create function.

   Lambda creates two versions of your function: $LATEST and Version 1. You can edit only the $LATEST version, but the console initially displays Version 1.

8. To edit the function, choose Version 1 near the top of the page, under the ARN for the function. Then, on the Versions tab, choose $LATEST. (If you left the function and then returned to it, the button label is Qualifiers.)

9. On the Configuration tab, choose the applicable Code entry type. Then follow the prompts to edit or upload your code.

10. For Runtime, choose the value based on your function's code.

11. In the Tags section, add any applicable tags.

12. Choose Actions, and then choose Publish new version.

13. Enter a description for the new version of the function.

14. Choose Publish.

15. Test and debug the function. For more information about testing in the Lambda console, see Invoke a Lambda function using the console in the AWS Lambda Developer Guide.

16. When you're ready to have the function execute for CloudFront events, publish another version and edit the function to add triggers. For more information, see Add triggers for a Lambda@Edge function.