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Kubernetes (often shortened to K8s) is a system for running and managing containerized applications automatically, especially when you have many containers across many servers.
It has a reputation for being the hardest thing in tech. I don't think it's hard. I think it's usually taught backwards — people show you all the parts before they show you the problems these parts solve. So let me give you the problem first, and the parts will explain themselves.
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The most important Kubernetes concepts
A Cluster is the entire Kubernetes environment, usually consisting of multiple machines.
A Node is one machine/server in that cluster.
A Pod is Kubernetes's smallest deployable unit. Usually, a pod contains one main application container.
A Deployment says something like:
"I want 5 copies of my backend running."
Kubernetes continuously tries to make reality match that desired state. If one crashes, Kubernetes creates another.
A Service gives those pods a stable network endpoint. This matters because individual pods can constantly disappear and be recreated.
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2026/09/23
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