Kubernetes (often shortened to K8s) comes up in every conversation about modern operations. But what is it really, and do you need it? Here’s a simple explanation for those who aren’t devops experts.
First: what is a container?
A container packages an app with everything it needs to run — code, libraries, settings — in an isolated, portable unit. It runs the same on your laptop as in the cloud. Docker is the most common tool for building containers.
What is Kubernetes?
Kubernetes is a system for orchestrating containers — running, coordinating and keeping many containers alive automatically. Once you have more than one container across several servers, it quickly gets hard to manage by hand. Kubernetes does it for you.
What Kubernetes does for you
- Scaling: starts more copies of your app when traffic rises, scales back afterwards.
- Self-healing: if a container dies, Kubernetes starts a new one automatically.
- Rollouts: new versions roll out gradually, with the ability to roll back.
- Scheduling: places containers smartly across your servers.
When do you need Kubernetes — and when not?
Kubernetes shines when you run many services (microservices), need to scale automatically and want high availability. But it’s also complex. If you run a single website or a small app, K8s is often overkill — a regular server or cloud server is plenty. The rule: bring in Kubernetes when the complexity demands it, not before.
Kubernetes in Sweden and the EU
If you run Kubernetes you usually want control over where the nodes live — for latency, cost and data residency. A Swedish cloud platform gives you K8s on EU-sovereign hardware, without depending on foreign hyperscalers.
Want to build on a Swedish foundation? Kepler’s cloud platform gives you instances, networking and storage today — and managed Kubernetes is on the roadmap.