title: Comma separator in Lambda function environment settings using the Serverless Framework
body: <p>I am trying to add a MongoDB cluster as part of a Serverless deployment, but I can't set the environment variable.</p>
  
  <p>Here is part of the <strong>serverless.yml</strong> file:</p>
  
  <pre><code>service: serverless-test
  
  plugins:
    - serverless-offline
  
  provider:
    name: aws
    runtime: nodejs4.3
    environment:
      MONGO_URI: "mongodb://mongo-6:27000,mongo-7:27000,mongo-8:27000/db-dev?replicaSet=mongo"
  </code></pre>
  
  <p>How do I pass the MONGO_URI to contain the cluster as a comma separated value?</p>
  
  <p>Any advise is much appreciated.</p>