You could modify serverless.yml - service value to your favorite name.

Firstly, you need to install serverless framework.

$ npm install -g serverless

And you need to config aws credentials, please follow the aws document.

Install layer plugin

$ sls plugin install -n serverless-ruby-layer

And deploy to aws

$ sls deploy --stage production

# or specify aws profile
$ sls deploy --stage production --aws-profile custom-profile

After deployed, you will see some outputs, copy the layers arn to your lambda layers, or you could find the arn in you AWS Lambda Layers list.

In your lambda project, you could config the serverless.yml use this layer like this

functions:
  my_own_function:
    handler: handler.call
    layers:
      - arn:aws:lambda:ap-northeast-1:xxxxxxx:layer:serverless-service-name-xxx:1

Deploy your lambda

$ serverless deploy

And test PG.library_version

Voila~