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Containers, gVisor, and microVMs: Who Shares the Kernel, the System Calls, and the Hardware

Containers share the host kernel, gVisor inserts a user-space kernel, and a microVM adds a guest kernel plus a hypervisor; all three still share the same host's CPU caches and storage.

Where an Agent's Code Runs: Five Layers of Isolation From Container to Monitoring

A piece of agent code passes through five layers on its way from execution to a network connection: container, kernel boundary, shared host, network perimeter, monitoring. Each layer promises one thing, and the shared host layer promises almost nothing.