Virtualization
DevOps & AdminVirtualization is a technology that abstracts physical computing resources so multiple isolated environments can run on the same hardware. Using a hypervisor or OS-level isolation, it divides CPU, RAM, storage, and networking into virtual machines or containers. This improves utilization, enables rapid provisioning, supports migration and snapshots, and helps hosting providers offer scalable plans with predictable resource boundaries.
How It Works
Virtualization inserts an abstraction layer between hardware and workloads. In hardware virtualization, a hypervisor (Type 1 on bare metal or Type 2 on top of an OS) allocates CPU time, memory pages, disk I/O, and virtual network interfaces to each virtual machine (VM). Each VM runs its own guest operating system and behaves like a separate server, even though it shares the underlying physical host with other VMs.
In OS-level virtualization, containers share the host kernel but isolate processes, filesystems, and networking using kernel features such as namespaces and cgroups. Containers start quickly and are lightweight, while VMs provide stronger separation and broader OS compatibility. Both approaches rely on management tooling for templates, images, snapshots, cloning, and live migration, which lets administrators move workloads between hosts for maintenance or load balancing with minimal disruption.
Why It Matters for Web Hosting
Most modern hosting products depend on virtualization to segment customers and deliver predictable performance. When comparing plans, virtualization affects how resources are guaranteed (dedicated vs shared), how well noisy neighbors are controlled, and what level of access you get (root on a VPS vs limited control on shared hosting). It also influences scaling options, backup and snapshot capabilities, and how easily a provider can migrate your site during upgrades or incidents.
Types of Virtualization
- Server virtualization (VMs) for VPS and dedicated-like isolation on shared hardware
- Container virtualization for packaging apps and microservices with fast startup
- Storage virtualization (logical volumes, pooled storage) to simplify capacity management and redundancy
- Network virtualization (virtual switches, VLANs, overlays) to isolate traffic and define software-based networks
- Desktop/application virtualization for running remote desktops or isolated apps in managed environments
Virtualization vs Containerization
Virtualization usually refers to VMs that virtualize hardware and run separate operating systems, offering strong isolation and compatibility at the cost of more overhead. Containerization virtualizes at the OS level, sharing the host kernel for higher density and faster deployment, but with tighter OS constraints and a different security model. For hosting buyers, VMs are common for VPS plans and root access, while containers are common behind managed platforms and modern DevOps workflows.