> You don't run your own registry (except in very rare circumstances where that makes sense). You author Dockerfile (or better yet use a tool like jib that creates containers automatically without even a Docker daemon), then you push to hosted registry.
Dockerfiles aren't trivial. I've helped migrate some services to docker and it's not "just put it in Docker and that's it". Specially because most applications aren't perfectly isolated.
> Ingress is trivial to use. Internally it's less trivial but you don't need to peek inside unless you manage to break it which generally speaking, you won't; even if you think whatever you are doing is very special it probably does it already. That is the benefit of literal thousands of teams using the exact same abstraction layer.
Literal thousands of teams also use Nginx and still doesn't mean that there aren't configuration errors, issues and other things that are to debug. Not to mention that a lot of applications can run without requiring a reverse proxy.
> You don't have SSH (this is objectively good), instead you can get exec on a container if you need it (and that container contains a shell). You can now control on a fine grained and integrated fashion exactly who is allowed to exec into a container and you get k8s audit events for free. (and if you are using a hosted system like GKE then it automatically flows into said providers audit system).
And that's cool if you need that, but "ssh user@machine" looks far easier.
> The point is you can buy managed k8s, there isn't an equivalent for old school sysadmin that doesn't amount to outsourcing to a body shop.
Look, the other day I had to set up a simple machine to monitor some hosts in a network. I've Ansible to automate it, but ultimately it boils down to "sudo apt install grafana prometheus; scp provisioning-dashboards; scp prometheus-host-config; scp unattended-upgrades-config" plus some hardening configs. I don't need redundancy, uptime is good enough with that. If Prometheus can't connect to the hosts, I can test from the machine, capture traffic or whatever and know that there isn't anything in the middle. If Grafana doesn't respond I don't need to worry whether the ingress controller is working well or if I missed some configuration.
Could I run that with Kubernetes? Well, managed k8s is already out of the window because the service is internal to an enterprise network. And self-hosted kubernetes? I still need to do the same base linux box configuration, plus setting up k8s, plus setting up the infra and networking with k8s plus the tools I actually want to use.
And that's the point. I am not trying to identify any k8s downsides, what I said that setting up k8s looks far more confusing than setting up a standard Linux box, and by the things you say I am even more convinced than before than it is indeed. I still need to understand and run the programs I want (which is most of the cost of deployment), but I also need to understand Kubernetes and, if I am using a managed platform, I need to understand how the managed platform works, configure it, link it with my system... In other words, not only do I need the general knowledge for application deployment but also the specific implementation in Kubernetes.