Kubernetes Core Concepts Broken Down: Pods, Deployments, Services and More

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Kubernetes is a system designed to run and manage containerized applications across multiple machines, using its own set of abstractions and vocabulary. The smallest deployable unit is a Pod, which groups one or more tightly coupled containers that share the same network and storage resources. Deployments build on this by managing a desired number of pod replicas and enabling rolling updates with zero downtime, while ReplicaSets ensure the correct replica count is always maintained. Since pod IP addresses are unstable, Services provide a consistent network endpoint and DNS name for accessing groups of pods, and can also be exposed externally. For more advanced HTTP routing, TLS termination, and path-based traffic rules, an Ingress resource — backed by a controller like NGINX or Traefik — is used to direct inbound connections to the appropriate cluster services.

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