What is the architectural difference between Docker Containers and Virtual Machines (VMs)?
Quick Revision Summary
VMs virtualize hardware and run independent guest OSs via hypervisors. Containers share the host kernel and use namespaces/cgroups for lightweight process isolation.
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Model Answer & Deep-Dive Explanation
Virtual Machines (VMs):
- Run on top of a Hypervisor (Type 1 bare-metal or Type 2 hosted).
- Each VM includes a complete guest operating system, virtual ke el, virtual drivers, and virtual hardware allocation.
- Heavier memory footprint (gigabytes), slower boot times (minutes), and higher CPU overhead.
Docker Containers:
- Share the host machine's Linux ke el directly.
- Isolate processes using Linux ke el primitives: cgroups (resource allocation limits like CPU/RAM) and namespaces (process IDs, network interfaces, mount points).
- Extremely lightweight (megabytes), instantaneous startup (seconds), and near bare-metal performance.
Interviewer Evaluation Points & Scoring Rubric
- 1 1. Clarifies shared kernel vs guest OS. 2. Cites Linux namespaces and cgroups. 3. Contrasts startup time, resource footprint, and isolation levels.
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