Kubernetes is an open-source container orchestration platform that automates deploying, scaling and managing containerized applications. Google originally developed it, and the Cloud Native Computing Foundation (CNCF) now maintains it.
It is needed because managing hundreds or thousands of containers by hand is impractical. Kubernetes does that work for you:
It restarts failed containers and replaces unhealthy instances, which keeps applications highly available.
It scales applications with demand and spreads traffic across the instances.
It packs containers onto nodes by their resource requests, which leaves less capacity sitting idle.
Its rolling updates let a new version go out with zero downtime.
Rewriting in plainer words…
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