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For development, we have deployed a instance of MailHog to our cluster, a simple mail server that catches all mails without forwarding them. It allows any user/password combination. Here is what our mailhog controller looks like:
The good news is that there are many efforts to make Kubernetes easier to use. Acorn aims to simplify application packaging and deployment. And services like Render and our very own Cloudplane use Kubernetes under the hood to deliver a user-friendly solution that requires zero Kubernetes knowledge.
With some experience and a user interface like Lens, debugging becomes easier. And there are great monitoring solutions for production use. But this is still a big hurdle for beginners taking their first steps with Kubernetes.
Flux lets us use a git repository as the single source of truth for our cluster, but for dynamic resources we will want to use the API server instead. We use both of these approaches; Flux sets up our cluster, and applications are created using our own Application resource.