VMs - Virutal Machines

myVMs

• Use cases

  • Qemu vs Proxmox
    • Qemu only if you don’t have a machine to install proxmox on
  • better for sandboxing

• Type 1 hypervisors - virtualizes hardware (faster + best security)

  • info
    • can still run more than 1 VM at the same time
    • slows down but only by a little <5% (also <1% in some cases)
      • unless you use partitioning to separate the hypervisor
  • General
    • KVM & Xen are low level, that’s why we use proxmox or XCP-ng respectively
    • some people still use vmware because proxmox is too low level compared to it (on scale)
    • QEMU is great bu considered by many too low level compared to proxmox- src
  • FOSS
    • KVM - less secure, simpler, maybe faster, +feats than xen
      • integrated into the Linux kernel
      • GPLv2
    • Proxmox
    • TrueNAS - KVM abstraction, virtualization & storage platform
      • vs proxmox - TLDR, use this mainly for storage, proxmox mainly for VMs
    • Xen - used by QubesOS - most secure
      • doesn’t expose VMs through localhost like proxmox by default
      • GPLv2
      • runs directly on the hardware as a separate layer
        • robust isolation and a smaller attack surface
      • supports both full virtualization and paravirtualization
    • XCP-ng - Xen abstraction
      • uses Xen orchestra (UI) to manage XCP-ng clients (or servers where you installed it)
      • better paid support than proxmox
    • QEMU - mainly for type 2 though
  • Proprietary
    • Vmware - (ESXi)
      • more abstractions but less flexibility compared to proxmox
      • ESXi - virtualization platform offered by VMware
    • Hyper-V - window’s thinghy that… doesn’t really does it
  • Vultr - usually use SSH without graph env

• Type 2 hypervisors - runs w host OS sharing resources (slower)

  • what? - “create an OS into another OS”
  • pros - easier management
    • backups
    • snapshots
    • setup
  • QEMU - the better virtual box - can also run as type1
    • compared to virtual box
      • almost bare metal perf thanks to KVM
      • easier less hacky stuff compared to guest additions
      • no bad license or closed source limitations like virtual box extension packs
      • uses more CLI for setup and some managment (not inizialization in fact)
  • Virtual box - just don’t use this, go to proxmox or QEMU

• Containerization - (fastest)

• Management

  • VM backup