diff --git a/content/docs/concepts/virtualization.mdx b/content/docs/concepts/virtualization.mdx index 009bf738..b594fec1 100644 --- a/content/docs/concepts/virtualization.mdx +++ b/content/docs/concepts/virtualization.mdx @@ -8,38 +8,41 @@ description: | Virtualization can be done using a hypervisor, which is a low-level software that virtualizes the underlying hardware and manages access to the real -hardware, either directly or through the host Operating System. There are 2 main -virtualized environments: virtual machines and containers, each with pros and -cons regarding complexity, size, performance and security. Unikernels come -somewhere between those 2. +hardware, either directly or through the host Operating System. +There are 2 main virtualized environments: virtual machines and containers, +each with pros and cons regarding complexity, size, performance and security. +Unikernels come somewhere between those 2. ## Virtual Machines A virtual machine represents an abstraction of the hardware, over which an operating system can run, thinking that it is alone on the system and that it -controls the hardware below it. Virtual machines rely on hypervisors to run -properly. +controls the hardware below it. +Virtual machines rely on hypervisors to run properly. A hypervisor incorporates hardware-enabled multiplexing and segmentation of compute resources in order to better utilize, better secure and better -facilitate the instantenous runtime of user-defined programs. By the -means of a virtual machine, an operating system is unaware of the multiplexing -which happens to facilitate its existence. The hypervisor emulates devices on -behalf of the guest OS, including providing access to virtual CPUs, virtual -Interrupt Controllers and virtual NICs, which are segmented from the underlying -hardware. +facilitate the instantenous runtime of user-defined programs. +By the means of a virtual machine, an operating system is unaware of the +multiplexing which happens to facilitate its existence. +The hypervisor emulates devices on behalf of the guest OS, including +providing access to virtual CPUs, virtual Interrupt Controllers and virtual +NICs, which are segmented from the underlying hardware. The hypervisors can be classified in 2 categories: Type 1 and Type 2: * The **Type 1 hypervisor**, also known as **bare-metal hypervisor**, has direct access to the hardware and controls all the operating systems that are running - on the system. The guest OSes have access to the physical hardware, and the - hypervisor arbiters this accesses. KVM is an example of Type 1 hypervisor. + on the system. + The guest OSes have access to the physical hardware, and the hypervisor + arbiters this accesses. + KVM is an example of Type 1 hypervisor. -* The **Type 2 hypervisor**, also known as **hosted hypervisor**, has to go - through the host operating system to reach the hardware. Access to the - hardware is emulated, using software components that behave in the same way - as the hardware ones. An example of Type 2 hypervisor is VirtualBox. +* The **Type 2 hypervisor**, also known as **hosted hypervisor**, has to go + through the host operating system to reach the hardware. + Access to the hardware is emulated, using software components that behave + in the same way as the hardware ones. + An example of Type 2 hypervisor is VirtualBox.