A host OS is the software installed on a computer that interacts with the underlying hardware and is normally used to describe an engage system used in a virtualized server to differentiate it from the node operating system .
A horde OS is most normally used to describe the operate system that interacts with the hardware and runs a type 2 hypervisor. A type 2 hypervisor, besides known as a host hypervisor, runs on top of a host operating organization quite than interacting directly with the hardware. This Type 2 hypervisor can then create multiple virtual machines ( VMs ) that will each run a node manoeuver system. In this case, guest operating systems do not need to be the same as the host OS .
Let ‘s consider a practical exemplar of a computer running Apple ‘s OS X engage system. If a user wanted to run an application available merely for Windows operating systems, the exploiter may use virtualization and install a Type 2 hypervisor, such as VMware Fusion, on the calculator running OS X. The user could then use the VMware Fusion hypervisor to create a VM and install Windows 10 as the manoeuver system on that VM. The exploiter would then be able to run his or her window application within this VM. The master example of OS X installed on the computer would be considered the host operational system, while Windows 10 ( running on the VM ) would be considered the guest operate on system .
however, not all virtualized servers make function of a host operate system. In many cases, a Type 1 hypervisor, besides known as a bare-metal hypervisor, is installed immediately onto a waiter ‘s hardware. The Type 1 hypervisor takes the place of the host OS and can then create virtual machines, each of which may run a guest manoeuver system.

The term host operating arrangement can besides be used to describe the function system that makes use of container-based virtualization. Containers are basically coherent partitions used to separate applications on the lapp server. Rather than replicate an stallion operational organization for each application, as is the case in a VM, containers allow applications on the same waiter to share the same operational system kernel but placid provide hardware isolation. This shared engage arrangement is known as the host OS .
Server administrators may besides run into the jumble position in which a VM ‘s guest operate system besides serves as the host operating system for a container. For example, consider a waiter running VMware ‘s ESXi Type 1 hypervisor that hosts a VM running a Linux distribution as the guest OS. The Linux guest OS could then be used to create multiple containers that would share the Linux OS kernel, which could consequently be considered a host OS .

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