this post was submitted on 09 Jul 2025
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From Docker with Ansible to k3s: I don't get it... (sh.itjust.works)
submitted 1 day 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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[–] moonpiedumplings@programming.dev 1 points 13 hours ago (1 children)

I've tried snap, juju, and Canonical's suite. They were uniquely frustrating and I'm not interested in interacting with them again.

The future of installing system components like k3s on generic distros is probably systemd sysexts, which are extension images that can be overlayed onto a base system. It's designed for immutable distros, but it can be used on any standard enough distro.

There is a k3s sysext, but it's still in the "bakery". Plus sysext isn't in stable release distros anyways.

Until it's out and stable, I'll stick to the one time bash script to install Suse k3s.

[–] atzanteol@sh.itjust.works 1 points 13 hours ago (1 children)

You're welcome to make whatever bad decisions you like. I can manage snaps with standard tooling. I can install, update, remove them with simple ansible scripts in a standard way.

Bash installers are bad. End of.

[–] moonpiedumplings@programming.dev 1 points 12 hours ago (1 children)

Canonical's snap use a proprietary backend, and comes at a risk of vendor lock in to their ecosystem.

The bash installer is fully open source.

You can make the bad decision of locking yourself into a closed ecosystem, but many sensible people recognize that snap is "of the devil" for a good reason.

[–] atzanteol@sh.itjust.works 1 points 5 hours ago (1 children)

You've made this about snap. Flatpak, rpm, deb, etc. all work too.

[–] moonpiedumplings@programming.dev 1 points 4 hours ago* (last edited 4 hours ago) (1 children)

Except k3s does not provide a deb, a flatpak, or a rpm.

[–] atzanteol@sh.itjust.works 1 points 3 hours ago (1 children)

Ah - you have discovered my complaint.

That is precisely why I went with microk8s instead. I don't install software from people who can't be bothered to package their software using standard deployment tools which has been the correct way to distribute Linux software for decades.

[–] moonpiedumplings@programming.dev 1 points 1 hour ago

So instead you decided to go with Canonical's snap and it's proprietary backend, a non standard deployment tool that was forced on the community.

Do you avoid all containers because they weren't the standard way of deploying software for "decades" as well? (I know people that actually do do that though). And many of my issues about developers and vendoring, which I have mentioned in the other thread I linked earlier, apply to containers as well.

In fact, they also apply to snap as well, or even custom packages distributed by the developer. Arch packages are little more than shell scripts, Deb packages have pre/post hooks which run arbitrary bash or python code, rpm is similar. These "hooks" are almost always used for things like installing. It's hypocritical to be against curl | bash but be for solutions like any form of packages distributed by the developers themselves, because all of the issues and problems with curl | bash apply to any form of non-distro distributed packages — including snaps.

You are are willing to criticize bash for not immediately knowing what it does to your machine, and I recognize those problems, but guess what snap is doing under the hood to install software: A bash script. Did you read that bash script before installing the microk8s snap? Did you read the 10s of others in the repo's used for doing tertiary tasks that the snap installer also calls?

# Try to symlink /var/lib/calico so that the Calico CNI plugin picks up the mtu configuration.

The bash script used for installation doesn't seem to be sandboxed, either, and it runs as root. I struggle to see any difference between this and a generic bash script used to install software.

Although, almost all package managers have commonly used pre/during/post install hooks, except for Nix/Guix, so it's not really a valid criticism to put say, Deb on a pedestal, while dogging on other package managers for using arbitrary bash (also python gets used) hooks.

But back on topic, in addition to this, you can't even verify that the bash script in the repo is the one you're getting. Because the snap backend is proprietary. Snap is literally a bash installer, but worse in every way.