Add triggers to a Lambda@Edge function - Amazon CloudFront

Add triggers to a Lambda@Edge function

You can use the AWS Lambda console or Amazon CloudFront console to add a trigger to your Lambda@Edge function.

Important

You can create triggers only for numbered versions of your function (not the $LATEST).

Lambda console
To add triggers to 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. In the Region list at the top of the page, choose US East (N. Virginia).

  3. On the Functions page, choose the name of the function that you want to add triggers for.

  4. On the Function overview page, choose the Versions tab.

  5. Choose the version that you want to add triggers to.

    After you choose a version, the name of the button changes to Version: $LATEST or Version: version number.

  6. Choose the Triggers tab.

  7. Choose Add trigger.

  8. For Trigger configuration, choose Select a source, enter cloudfront, and then choose CloudFront.

    Note

    If you've already created one or more triggers, CloudFront is the default service.

  9. Specify the following values to indicate when you want the Lambda function to execute.

    1. Distribution – Choose the distribution that you want to add the trigger to.

    2. Cache behavior – Choose the cache behavior that specifies the objects that you want to execute the function on.

      Note

      If you specify * for the cache behavior, the Lambda function deploys to the default cache behavior.

    3. CloudFront event – Choose the CloudFront event that causes the function to execute.

    4. Include body – Select this check box if you want to access the request body in your function.

    5. Confirm deploy to Lambda@Edge – Select this check box so that AWS Lambda replicates the function to AWS Regions globally.

  10. Choose Add.

    The function starts to process requests for the specified CloudFront events when the updated CloudFront distribution is deployed. To determine whether a distribution is deployed, choose Distributions in the navigation pane. When a distribution is deployed, the value of the Status column for the distribution changes from Deploying to the date and time of deployment.

CloudFront console
To add triggers for CloudFront events to a Lambda function
  1. Get the ARN of the Lambda function that you want to add triggers for:

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

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

    3. In the list of functions, choose name of the function that you want to add triggers to.

    4. On the Function overview page, choose the Versions tab, and choose the numbered version that you want to add triggers to.

    5. Choose the Copy ARN button to copy the ARN to your clipboard. The ARN for the Lambda function looks something like this:

      arn:aws:lambda:us-east-1:123456789012:function:TestFunction:2

      The number at the end (2 in this example) is the version number of the function.

  2. Open the CloudFront console at https://console.aws.amazon.com/cloudfront/v4/home.

  3. In the list of distributions, choose the ID of the distribution that you want to add triggers to.

  4. Choose the Behaviors tab.

  5. Select the cache behavior that you want to add triggers to, and then choose Edit.

  6. For Function associations, in the Function type list, choose Lambda@Edge for when you want the function to execute: for viewer requests, viewer responses, origin requests, or origin responses.

    For more information, see Decide which CloudFront event to use to trigger a Lambda@Edge function.

  7. In the Function ARN / Name text box, paste the ARN of the Lambda function that you want to execute when the chosen event occurs. This is the value that you copied from the Lambda console.

  8. Select Include body if you want to access the request body in your function.

    If you just want to replace the request body, you don't need to select this option.

  9. To execute the same function for more event types, repeat steps 6 and 7.

  10. Choose Save changes.

  11. To add triggers to more cache behaviors for this distribution, repeat steps 5 through 10.

    The function starts to process requests for the specified CloudFront events when the updated CloudFront distribution is deployed. To determine whether a distribution is deployed, choose Distributions in the navigation pane. When a distribution is deployed, the value of the Status column for the distribution changes from Deploying to the time and date of deployment.