How to do it...

1. Create the project from the following template:

$ sls create --template-url https://github.com/danteinc/js-cloud-native-cookbook/tree/master/ch1/create-function --path cncb-create-function

2. Navigate to the cncb-create-function directory with cd cncb-create-function.
3. Review the file named serverless.yml with the following content:

service: cncb-create-function

provider:
  name: aws
  runtime: nodejs8.10
  environment:
    V1: value1

functions:
  hello:
    handler: handler.hello

4. Review the file named handler.js with the following content:

module.exports.hello = (event, context, callback) => {
  console.log('event: %j', event);
  console.log('context: %j', context);
  console.log('env: %j', process.env);
  
  callback(null, 'success');
};

5. Install the dependencies with npm install.
6. Run the tests with npm test.
7. Review the contents generated in the .serverless directory.
8. Deploy the stack: 

$ npm run dp:lcl -- -s $MY_STAGE

> cncb-create-function@1.0.0 dp:lcl <path-to-your-workspace>/cncb-create-function
> sls deploy -r us-east-1 "-s" "john"

Serverless: Packaging service...
Serverless: Excluding development dependencies...
Serverless: Creating Stack...
Serverless: Checking Stack create progress...
.....
Serverless: Stack create finished...
Serverless: Uploading CloudFormation file to S3...
Serverless: Uploading artifacts...
Serverless: Uploading service .zip file to S3 (881 B)...
Serverless: Validating template...
Serverless: Updating Stack...
Serverless: Checking Stack update progress...
.................
Serverless: Stack update finished...
Service Information
service: cncb-create-function
stage: john
region: us-east-1
stack: cncb-create-function-john
api keys:
 None
endpoints:
 None
functions:
 hello: cncb-create-function-john-hello

9. Review the stack and function in the AWS Console.
10. Invoke the function with the following command:

$ sls invoke -r us-east-1 -f hello -s $MY_STAGE -d '{"hello":"world"}'
"success"

11. Review the function metrics in the AWS Console:

12. Review the function logs in the AWS Console:

13. Take a look at the logs locally: 

$ sls logs -f hello -r us-east-1 -s $MY_STAGE
START RequestId: ... Version: $LATEST
2018-03-24 15:48:45 ... event: {"hello":"world"}
2018-03-24 15:48:45 ... context: {"functionName":"cncb-create-function-john-hello","memoryLimitInMB":"1024", ...}
2018-03-24 15:48:45 ... env: {"V1":"value1","TZ":":UTC","AWS_REGION":"us-east-1", "AWS_ACCESS_KEY_ID":"...", ...}
END RequestId: ...
REPORT ... Duration: 3.64 ms Billed Duration: 100 ms ... Max Memory Used: 20 MB    

14. Remove the stack once you have finished with npm run rm:lcl -- -s $MY_STAGE.