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Containers don’t magically isolate applications — Linux uses namespaces and cgroups behind the scenes. Namespaces isolate what a process can see (PID, network, filesystem), while cgroups control how much CPU and memory it can use. Together, they create the foundation for containers in Docker and orchestration in Kubernetes. Understanding namespaces and cgroups helps explain how Kubernetes runs multiple containers securely on the same node while keeping them isolated and resource-controlled #linux #docker #kubernetes #container