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I am preparing for an upcoming DevOps engineer interview, and one of the core conceptual questions I frequently see on practice lists involves comparing Docker containers with traditional Virtual Machines (VMs).
While I know that containers are lighter than VMs, I want to make sure I can explain the underlying architecture thoroughly to a technical interviewer. Specifically, I am trying to structure my response around several key technical points:
- How kernel sharing works in Docker versus hypervisor-based virtualization in VMs like VMware or KVM.
- The performance and memory footprint implications of running multiple containers compared to multiple virtual guest OS instances.
- Security boundary differences and isolation guarantees provided by Linux namespaces and cgroups compared to hardware-level virtualization.
What are the most critical architectural details an interviewer expects to hear when asking this comparison question, and how should candidate responses address the tradeoffs between containers and VMs?
