title: Create new instances of a Google App Engine Service
body: <p>I have a Google App Engine Java 11 service using the Standard Environment.</p>
  <p>I have deployed it specifying in the corresponding <code>app.yaml</code> file manual scaling, setting the number of instances to 1.</p>
  <p><strong>Is there a way that I can increase the number of instances for this service without having to upload again all the files in the service?</strong></p>
  <p><strong>So I have one instance. Now I want 2 instances. How do I do this?</strong></p>
  <p>Have not found a way in either the console or in the gcloud utilities to do this.
  Also, just calling <code>gcloud app deploy</code> with the modified <code>app.yaml</code> file creates a broken version of the service.</p>
  <p><code>app.yaml:</code></p>
  <pre><code>service: headergrabber
  runtime: java11
  instance_class: B8
  
  manual_scaling:
    instances: 1
  </code></pre>