I'm diving into the world of Kubernetes by setting up a home K3s lab using four Raspberry Pi 5s (the 16 GB model). I've never managed a direct Kubernetes cluster like this before, as my previous experience was mainly with EKS and GKS. My plan is to use one Pi as the control plane and the other three as my cluster nodes. I've also bought NVMe SSDs for each Pi and a PoE+ HAT for convenient power supply. For storage, I'll rely on my Synology NAS for any required volumes and hope to use it to receive signals from my UPS in case of a power outage, allowing for a graceful shutdown of the Pis. I'm initially setting this up to migrate some web scraping jobs that have become cumbersome on my MacBook. This project is not just practical but also an exciting learning experience that could enhance my job prospects. Are there any essential considerations or potential issues I should be aware of? Additionally, if I decide to introduce a more powerful node down the line for heavy tasks, will my current Pi-based control plane manage well, or will I need to upgrade it too?
5 Answers
I've been running a few Pi 5s myself, and they've worked great for my home cluster. I use Rook-Ceph for my storage. Just stay mindful that while they work, they might struggle with higher workloads. If you're planning to run heavy tasks, a more robust setup could be better.
Right, it's all about balancing your needs with the hardware specs.
If you need to upgrade later, consider using cloud services as remote nodes. Oracle's free tier for ARM has been a game-changer for me; it runs quite well compared to my Pis. This could also save some hassle of local hardware upgrades for intensive tasks.
That's an interesting approach! I might explore a hybrid solution.
For sure! There's a lot of flexibility in Kubernetes.
For your OS choice, consider Talos Linux! I recently switched and have found it much more straightforward for K3s environments. Just be aware that it's still in pre-release for the Pi 5, so keep an eye on updates!
Good to know! What advantages does Talos have over regular K3s?
Yeah, I’m curious about this too!
If you're looking for alternatives, mini PCs can give you a lot of power for not much more money. I got a couple of mini PCs with decent specs for a super affordable price. The price of Raspberry Pis might not make sense for larger setups anymore.
I see your point! Especially considering the performance-to-price ratio.
Definitely a viable option; I've seen mini PCs outperform Pi setups.
Your setup sounds solid! The Pi 5s with NVMe should handle your K3s cluster just fine, especially for web scraping. I've got three Pi 5s running as worker nodes, and they've been doing well, although my control plane runs on VMs. If space isn't a problem, you could consider mini PCs for more power, but for starting out, your setup will work well. Kubernetes is great for scaling, so you can always add more nodes later if you need extra resources!
Absolutely! K3s isn't very heavy on resources, so your 16GB Pis should cover your needs well. Plus, with more memory, NVMe might be overkill unless you're pushing the limits.
Exactly, you can gradually upgrade as needed! Just keep in mind mixing architectures can complicate things.
Gotcha! It's good to hear they work well overall, but I'll watch out for performance issues.