Everything above took one Docker 514 installation per host, one Compose-style file and about twenty commands. That simplicity is Swarm 514 's whole argument. Kubernetes 5,150 (Kubernetes) asks for more up front and gives much more back:
| Aspect | Docker Swarm | Kubernetes |
|---|---|---|
| Installation | Built into Docker Engine 514 | A distribution: kubeadm 5,150 , k3s 51,195 , kind, EKS 24 , GKE 1 , AKS 6 |
| Configuration | A Compose 514 file plus deploy | Many resource kinds in YAML, Helm 29,435 charts |
| Autoscaling | None built in | Horizontal Pod Autoscaler, cluster autoscaler |
| Extensibility | Fixed feature set | Custom resources, operators, CSI, Gateway API |
| Managed offerings | None from the big clouds | Every major cloud provider |
| Development | Maintenance fixes; Mirantis support to 2030 | New minor release every four months or so |
| Best fit | A few hosts, a small team | Many services and teams, anything that must grow |
Swarm's strengths are low overhead (each lab node's daemon used about 26 MiB before running any task) and a learning curve of an afternoon for a team that knows Compose. Its weaknesses show as a system grows: no autoscaling, a small ecosystem, no managed control plane, and a job market that asks for Kubernetes. Both are open source under Apache-2.0. Asked in an interview why you would still pick Swarm, answer: for a small, stable deployment where Kubernetes' operational cost buys nothing.