You come off as very arrogant who believes he knows everything, some humility would suit you well, but I think all pseudo smart Germans are like that.
Why? Do you also see any purpose in hopping on one foot to work instead of driving there?
I don't understand what leads people like you to try to move goalposts to pretend something is harder than it is or needs to be.
I am not German, and I have never been to Germany. If we're trading wild speculation about personal details, I think you could use some ambition and self-confidence.
So my post is not about Kubernetes per se - but about narration "it is super easy 6 year old could do it", well no not everyone can do it and one has to spend time with any new technology.
Besides nmap in that scenario is not helping as well, beacuse I have to expose port 443 to serve my customers and Kubelets expose https endpoints. If someone runs simple nmap scan sees 443 open and concludes all is correct because he will be serving https websites - so your "you are done in like 30 seconds" seems like shooting oneself in the foot.
I agree that 6-year-olds and other people without any production sysadmin or SRE experience are going to have a pretty bad time learning to build and deploy a Kubernetes cluster.
My point is that any professional sysadmin or SRE can learn Kubernetes just fine. Yeah, there's a lot of stuff, but there's just about as many moving parts as I expect for a system that handles what Kubernetes does. You also mostly don't have to pay complexity cost for many optional features you don't care about; you can get a minimal cluster up, and then grow it as you need more features.
I don't follow what you're saying about port 443. The kubelet API is not listening on port 443 by default. I'm as confident as I can be without checking that no kubernetes components listen on port 443 by default.
Speaking more broadly, I agree that someone with no SRE experience and no network security experience won't get much value from 30 seconds of nmap. What I was trying to say is that "accidentally exposed the kubelet API to the global internet" is something that I expect a competent sysadmin to be able to detect and notice with 30 seconds of nmap.
When I'm saying "deploying kubernetes is fine", I'm saying that anyone who has any business running nontrivial production services in a professional setting will not have any trouble learning to use and deploy Kubernetes. Deploying a cluster does require competence with sysadmin or SRE fundamentals, but not particularly more so than other systems that handle similarly-complex topics.
Also, any junior sysadmin or programmer should be able to learn to use an already-running kubernetes cluster to deploy basic services with no trouble and just a bit of time. I have trained quite a few people on this, and it really does go just fine.
What does this have to do with kubernetes? "Don't expose stuff to the internet that you don't intend for everyone across the planet to be able to access" applies exactly the same to literally everything you could run on your servers.
This isn't remotely "Kubernetes is uniquely scary and complicated"; this is basic fundamental network security, and if you're not already handling this, then you need to go brush up on your basic networking fundamentals, not blame it somehow on kubernetes.
Almost every network service I can think of defaults to accepting unauthenticated connections, or connections authenticated with some default credentials. This is the normal, expected, default situation with network services. If you make the decision to expose something to the entire world, in a professional context, it is your responsibility to know the specific reasons it is safe to do so.
Are you really trying to argue that "Some rando decided to bareback the entire global internet with no firewall, on a personal home server, and didn't bother to type 'kubernetes secure configuration' into google, therefore Kubernetes is super hard and complicated and dangerous"?
It's not like this is some obscure cryptic detail; it's explicitly called out in the documentation that any half-decent professional would read before deploying a production service: https://kubernetes.io/docs/tasks/administer-cluster/securing...
Yes, untrained amateurs sometimes do dumb stuff. Sometimes companies leave their S3 buckets open to the world. Sometimes people expose mysql to the internet with credentials they ship to users. Sometimes people expose unauthenticated Redis to the internet. This does not mean that these technologies are somehow fundamentally too complicated for mere mortals, it just means that it's dangerous to ask amateurs to do something in a professional context.