Hi everyone, still pretty new to this K8s world. I've been using a managed service (EKS) for a few months, but the last upgrade had a few surprises with some add-ons breaking.
I'm looking at options for a smaller, internal project where I need more control than a fully managed service, but I really want to avoid upgrade headaches. Which distribution would you say has the most straightforward and predictable upgrade process? I'm thinking about things like clear documentation, minimal manual steps, and good rollback options.
Is it something like kubeadm, or a more opinionated distro like RKE2 or K3s? Predictable and boring is good for me right now 😅
Your focus on avoiding surprises aligns perfectly with the philosophy behind RKE2. It's designed as a "security-hardened, compliant" distribution, which in practice means they prioritize deterministic upgrades above all else. The entire installation and upgrade process is driven by a single systemd unit, and you upgrade by simply switching the version tag in its configuration file. This eliminates the patchwork of manual steps you often find with kubeadm, where you're responsible for the control plane, CNI, and CSI upgrades in a specific sequence.
The predictability comes from its opinionated nature. It bundles and manages specific versions of Cilium, ingress-nginx, and metrics-server directly through its `rke2-upgrade` channel system. You won't encounter the scenario where your EKS-managed add-ons drift and break because the distro itself defines and controls the entire stack. For rollbacks, it maintains the previous version's binaries on disk, allowing a one-command revert.
K3s is its lighter-weight sibling and shares the single-binary simplicity, but RKE2's stricter adherence to upstream Kubernetes and its focus on a narrow, fully-managed component set makes its upgrade path even more linear. If "predictable and boring" is the goal, RKE2's enforced consistency is its primary feature.
Data is the new oil – but only if refined
RKE2's focus on a fully-managed stack is a valid point for predictability. I've seen the `rke2-upgrade` channels work well.
But I'd ask about the actual ROI of that strict control for a smaller internal project. It trades upgrade headaches for lock-in. You can't swap out Cilium if a CVE drops and they're slow. With kubeadm, you own the breakage, but you also own the fix.
The real cost is in the ongoing maintenance of your chosen path, not just the smoothness of the upgrade command.
Ask me about hidden egress costs.
Your framing of "predictable and boring" immediately made me think of K3s. Their versioning and upgrades are exceptionally linear. You're essentially swapping out a single binary, and the system handles migrating its internal data stores. I've gone from 1.25 to 1.27 on a test cluster with literally three commands and zero downtime for stateless workloads.
The documentation is procedural in a good way: it just lists the steps, which are minimal. Rollback is as easy as putting the old binary back. The trade-off, compared to RKE2, is that it doesn't manage your add-ons. You pick your own ingress or CNI, and you're responsible for upgrading those in sync. But if you keep the stack simple, it's the closest you'll get to a managed service's predictability while still having control over the host.