this post was submitted on 05 Sep 2023
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Ok so just learn Kubernetes. And then realize that for it to be useful in a production environment, it needs like 10 other third party things, which you’ll also have to learn, and you’re done!
Rule of thumb for kubernetes, if you are learning it "for fun" or on your own, you are not gonna need it :)
Thanks for saying that.....I thought I was the only one who thought like that.
I just want to understand in detail what it is and how it works. Advice?
I've found it best explained in some stackoverflow answer mentioning the pet vs cattle analogy. In short, if you know how many servers you have from the tip of your tongue, and what they do more or less, then they are akin to pets: you treat them well and keep an eye on each of them.
Kubernetes is meant for when you have so many of them, that come and go without you even noticing or caring, bearing a number for the sake of production/cost control, this is cattle. Needless to say that this is not your typical app/company running at such a scale, and that there is a 24/7 team of "ranchers" keeping an eye on the herd.
https://github.com/kelseyhightower/kubernetes-the-hard-way
Thanks. So TL;DR it allows you to set up a little cloud computing service on your own physical machines, minus load balancing which you have to add on?
It can be used to scale cloud computing services as much as you want. It's a scalable container runtime at its core. It provides a means for scaling an overlay network with service discovery and uniform ingress configuration.
10 is a bit exaggerating. What do you really need?
ExternalDNS is nice so you don't have to config your DNS manually. You might need to install your own Ingress controller. If you want to automatically add and renew certificates cert-manager is great. Security is important! Speaking of, you should add some kind of secret management (something like sealed-secrets, vault or Secrets Store CSI Driver).
A really important thing is monitoring so you know your pods and the cluster itself is healthy. Prometheus is still king in that regard in my opinion. PromQL isn't that hard. Of course some kind of alerting like AlertManager is a must for prod environments. Be aware that the front ends of those tools are not behind a login so something like oauth2-proxy and dex is vital! You might want to have some visualisation too so Grafana is a nice addition. If you add Loki too you got your OPs covered.
Keeping track of all of your stuff is the hard part so some GitOps is highly recommended. ArgoCD or FluxCD are popular for a reason!
I think that should cover the basic setup so you may scale your CRUD app without worries!
I think you covered at least 10 things.