Getting started with Lambda

To create a Lambda function with the console

1. Open the Functions page of the Lambda console.

2. Choose Create function.

3. Select Use a blueprint.

4. Open the Select blueprint dropdown list and search for Hello world function. Select nodejs or python.

5. Enter a Function name.

6. For Execution role, choose Create a new role with basic Lambda permissions. Lambda creates an execution role that grants the function permission to upload logs to Amazon CloudWatch. The Lambda function assumes the execution role when you invoke your function, and uses the execution role to create credentials for the Amazon SDK and to read data from event sources.

1. Choose the Test tab.

2. For Test event action, choose Create new event.

3. For Event name, enter a name for the test event.

4. For Event sharing settings, choose Private.

5. For Template, leave the default hello-world option.

6. In the Event JSON, replace value1 with hello, world! Don't change key1 or the event structure. Example:

   {
       "key1": "hello, world!",
       "key2": "value2",
       "key3": "value3"
     }

7. Choose Save, and then choose Test. Lambda invokes the function on your behalf. The function handler receives and then processes the sample event.

8. Review the Execution result. Under Details, you should see the value that you entered in step 6: "hello, world!". The execution result also includes the following information:

   • The Summary section shows the key information from the REPORT line in the invocation log.

   • The Log output section shows the complete invocation log. Lambda writes all invocation logs to Amazon CloudWatch.

9. Choose Test to invoke the function a few more times and gather additional metrics that you can view in the next step.

10. Choose the Monitor tab. This page shows graphs of the metrics that Lambda sends to CloudWatch.

    Note

    It mights take 5 to 10 minutes for logs to show up after a function invocation.

    

    For more information on these graphs, see Monitoring functions on the Lambda console.

To delete a Lambda function

1. Open the Functions page of the Lambda console.

2. Choose a function.

3. Choose Actions, Delete.

4. In the Delete function dialog box, enter delete, and then choose Delete.

To delete the log group

1. Open the Log groups page of the CloudWatch console.

2. Select the function's log group (/aws/lambda/my-function).

3. Choose Actions, Delete log group(s).

4. In the Delete log group(s) dialog box, choose Delete.

To delete the execution role

1. Open the Roles page of the Amazon Identity and Access Management (IAM) console.

2. Select the function's execution role (for example, my-function-role-31exxmpl).

3. Choose Delete.

4. In the Delete role dialog box, enter the role name and then choose Delete.