title: Got an error "ZONE_RESOURCE_POOL_EXHAUSTED" when creating a new instance on Google Cloud
body: <p>Recently I created a number of GPU instances on Google Cloud across 5 regions.</p>
  
  <p>However when I tried to create more than a number of instances in one region, I got an error <code>ZONE_RESOURCE_POOL_EXHAUSTED</code>.</p>
  
  <p>I googled about the error, and found <a href="https://groups.google.com/forum/#!topic/gce-discussion/nV1Ym57OCj8" rel="noreferrer">here</a> mentioned about it's a resource limit on the corresponding region.</p>
  
  <p>I wonder if it's actually a quota limit per user account or project, or  the only way is to wait for other users to release their resources ?</p>