title: How to auto-update Google Cloud Managed Instance Group
body: <p>I use google cloud instance group with instance template (container registry) to manage many instances. But I have some problem with my MIG.</p>
  <p>I set the container registry path to <code>gcr.io/prok/server</code> in my instance template.</p>
  <p>I expect MIG to be updated automatically when I push new version docker image to container registry but it's not. MIG doesn't auto-update.</p>
  <p>Many articles about MIG's said to create new instance template for update (v1-&gt;v2) and change instance template in MIG to new version template... but I want the MIG to automatically update without creating new instance template.</p>
  <p>How do I do this?</p>