$ k8scalc compare k3s kubeadm
k3s vs kubeadm Kubernetes
k3s vs kubeadm — which Kubernetes distribution is right for your self-hosted cluster? Compare setup time, resource overhead, HA complexity, and production suitability.
Featurek3skubeadm
Control plane RAM
~512 MB
~1.5 GB
Binary size
<100 MB (single file)
Multiple components
Install time
~5 minutes
30–60 minutes
Embedded HA (etcd)
Yes
Requires external etcd
ARM support
Excellent
Good
Full Kubernetes API
Yes (CNCF certified)—
Yes (upstream)—
Upgrade process
k3s upgrade (simple)
kubeadm upgrade (multi-step)
Vendor neutrality
Rancher/SUSE
None (upstream K8s)
Production use
Yes—
Yes—
Component configurability
Moderate
Full
Verdict
k3s is better for 90% of self-hosted use cases. It installs in under 5 minutes, uses 3× less RAM on the control plane, handles embedded etcd HA automatically, and produces the same Kubernetes API. kubeadm shines when you need full control over every component, direct upstream Kubernetes without any vendor, or specific enterprise requirements that k3s bundles away. For a Hetzner-hosted cluster, k3s reduces the minimum viable control plane from a cpx31 to a cx23.