title: ERROR: The overall deployment failed because too many individual instances failed deployment
body: <p>I'm trying to deploy using CircleCI -&gt; S3 -&gt; CodeDeploy -&gt; EC2.
  I was able to upload deploy image onto S3 from CircleCI, but unable to deploy S3 to EC2 instance. Here's the error.</p>
  <blockquote>
  <p>The overall deployment failed because too many individual instances
  failed deployment, too few healthy instances are available for
  deployment, or some instances in your deployment group are
  experiencing problems. (Error code: HEALTH_CONSTRAINTS)</p>
  </blockquote>
  <p>The error was provided from CodeDeploy. I can't figure out why and how.
  I'd appreciate if you give some advise.</p>