Restart a GAE instance without re-deploying

The "Flush memcache" approach didn't work for me. I couldn't find where to shutdown a service either.

Instead, I found a way to delete the instance being served then hit the application's url. App engine would automatically create a new instance, which essentially would be a restart.

To delete an instance, do this:

From App engine dashboard, click "Instances" on the side menu. On the Instances page—below the graph—you would see a list of active instances, delete them, then hit your app's url.

Go to the Datastore viewer tab in your App Engine console. Click on "Flush memcache" button. Or, go to the Memcache viewer tab and click on "Flush cache" button.

If you want to restart your instance manually - shut it down. Then hit your website, and a new instance will be created automatically. There is no need to redeploy your app again.