Selfhosted
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I have 3 raspberry PIs, 4 various lenovo tiny PCs all in a kubernetes cluster and it seems I need more RAM than CPU. Storage is on a DIY NAS with 8*8TB disks in a raid 6.
I run bookstack, nextcloud, 2007scape, gitea, synapse, the *are stack, Plex, and a bunch of other things.
If I was just starting out I'd grab a used lenovo tiny or two, set up a docker cluster and play with that. There is software to replicate local storage across nodes that I've never touched but I'd try out a few of them also if you don't want to use a NAS. Worst case, just use local storage and the containers will be locked to that host.
I think Proxmox let's you run VMs and Containers too if you prefer that route.
Why swarm and not not k3s?
I've never actually used swarm so I could be wrong. However, I was under the impression that Docker swarm is a lot easier to use with a lot more examples for people to deploy their Containers.
With K8s/K3s I find myself translating a lot of docker examples into deployment yamls with Services, Network Policies, PVCs, secrets, etc, etc. It's just a lot more lines in the .yml files. This also assumes you know that anything that you run in docker you can run in K8s with 1 replica and more is not ideal.
Ok, k8s is harder but I feel that applying configuration remotely is more robust. I haven’t used swarm though.