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From Docker with Ansible to k3s: I don't get it... (sh.itjust.works)

submitted 11 months ago by sunoc@sh.itjust.works to c/selfhosted@lemmy.world

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Hey! I have been using Ansible to deploy Dockers for a few services on my Raspberry Pi for a while now and it's working great, but I want to learn MOAR and I need help...

Recently, I've been considering migrating to bare metal K3S for a few reasons:

To learn and actually practice K8S.
To have redundancy and to try HA.
My RPi are all already running on MicroOS, so it kind of make sense to me to try other SUSE stuff (?)
Maybe eventually being able to manage my two separated servers locations with a neat k3s + Tailscale setup!

Here is my problem: I don't understand how things are supposed to be done. All the examples I find feel wrong. More specifically:

Am I really supposed to have a collection of small yaml files for everything, that I use with kubectl apply -f ?? It feels wrong and way too "by hand"! Is there a more scripted way to do it? Should I stay with everything in Ansible ??
I see little to no example on how to deploy the service containers I want (pihole, navidrome, etc.) to a cluster, unlike docker-compose examples that can be found everywhere. Am I looking for the wrong thing?
Even official doc seems broken. Am I really supposed to run many helm commands (some of them how just fails) and try and get ssl certs just to have Rancher and its dashboard ?!

I feel that having a K3S + Traefik + Longhorn + Rancher on MicroOS should be straightforward, but it's really not.

It's very much a noob question, but I really want to understand what I am doing wrong. I'm really looking for advice and especially configuration examples that I could try to copy, use and modify!

Thanks in advance,

Cheers!

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[–] jlh@lemmy.jlh.name 2 points 11 months ago* (last edited 11 months ago)

For question 1: You can have multiple resource objects in a single file, each resource object just needs to be separated by ---. The small resource definitions help keep things organized when you're working with dozens of precisely configured services. It's a lot more readable than the other solutions out there.

For question 2, unfortunately Docker Compose is much more common than Kubernetes. There are definitely some apps that provide kubernetes documentation, especially Kubernetes operators and enterprise stuff, but Docker-Compose definitely has bigger market share for self-hosted apps. You'll have to get experienced with turning a docker compose example into deployment+service+pvc.

Kubernetes does take a lot of the headaches out of managing self-hosted clusters though. The self-healing, smart networking, and batteries-included operators for reverse-proxy/database/ACME all save so much hassle and maintenance. Definitely Install ingress-nginx, cert-manager, ArgoCD, and CNPG (in order of difficulty).

Try to write yaml resources yourself instead of fiddling with Helm values.yaml. Usually the developer experience is MUCH nicer.

Feel free to take inspiration/copy from my 500+ container cluster: https://codeberg.org/jlh/h5b/src/branch/main/argo

In my repo, custom_applications are directories with hand-written/copy-pasted yaml files auto-synced via ArgoCD Operator, while external_applications are helm installations, managed via ArgoCD Operator Applications.