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Updating a Kubernetes Deployment and waiting for it to roll out in a shell script

For some Kubernetes cluster operations (e.g. deploying an update to a small microservice or app), I need a quick and dirty way to:

  1. Build and push a Docker image to a private registry.
  2. Update a Kubernetes Deployment to use this new image version.
  3. Wait for the Deployment rollout to complete.
  4. Run some post-rollout operations (e.g. clear caches, run an update, etc.).

There are a thousand and one ways to do all this, and many are a bit more formal than this, but sometimes you just need a shell script you can run from your CI server to do it all. And it's not too hard, nor complex, to do it this way:

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