48 lines
1.6 KiB
Markdown
48 lines
1.6 KiB
Markdown
Lecture Topic: Virtualization
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| | Windows | Linux |
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| ----------------- | -------------- | --------------------- |
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| Executable Format | .exe .bat .ps1 | .sh ELF standard .out |
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| Library Format | .dll | ELF .o .so |
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Executables tend to not be portable, on Linux usually due to differences in the flavor of Linux, and even on windows due to different platform architecture. Interoperability is not guaranteed.
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The differences between simulation and emulation
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Simulation: getting the result
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Emulation: mimicking the behavior
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Virtualization:
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Alternative to emulation and simulation: allows access to hardware by generating appropriate machine code
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Why Virtualization?
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- Access to hardware
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- Safety, sandboxed, controlled environment
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- Multiple Users
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Kinds of VMs
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Type 1 virtual machine: manages the VMs directly, with no interaction with a base kernel
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Type 2 virtual machine: manages the VMs through interactions with the hardware with a main kernel
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Process VM
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- One purpose functionality VM
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- Java VM as an example
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OS VM
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- Virtual machine that emulates entire OS/machine functionality
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Example VM stack
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- VirtualBox VM
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- VirtualBox VMM
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- Windows
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- Hyper-V
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- Hardware
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| Virtualbox | Hyper-V |
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| ---------------- | -------------- |
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| OS VM, Type 2 VM | VMM, Type 1 VM |
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| WSL | Docker |
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| --------------------------------------------- | -------------------------------- |
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| Uses Hyper-V, Reuses system calls if possible | Containers, minimal dependencies |
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