Glossary of terms
A hypervisor, also known as a virtual machine monitor (VMM), is a software, firmware, or hardware component that creates and runs virtual machines (VMs) on a single physical host system. It acts as a virtualization platform that allows multiple operating systems and applications to run concurrently on the same hardware.
A hypervisor is a software layer that abstracts the physical hardware resources and intelligently allocates them among multiple virtual machines, enabling efficient resource utilization, isolation, and consolidation.
1. Hardware Virtualization: The hypervisor virtualizes the underlying physical hardware resources, including CPU, memory, storage, and network interfaces, and presents them as virtualized resources to the guest operating systems running in the virtual machines.
2. Virtual Machine Management: The hypervisor is responsible for creating, starting, stopping, and managing the lifecycle of virtual machines. It handles the allocation of physical resources to each virtual machine and ensures isolation between them.
3. Resource Sharing and Isolation: The hypervisor enables efficient resource sharing by dynamically allocating physical resources to virtual machines based on their needs. It also provides isolation between virtual machines, ensuring that one VM’s activities do not affect the performance or security of others.
4. Hardware Abstraction: The hypervisor abstracts the underlying hardware, allowing virtual machines to run on different physical hardware configurations without the need for modifications.
5. Secure Execution Environment: The hypervisor provides a secure and isolated execution environment for virtual machines, protecting them from potential security threats and ensuring data integrity.
The scope of a hypervisor encompasses various aspects of virtualization, including:
1. Server Virtualization: Hypervisors are widely used in server environments to consolidate multiple operating systems and applications onto a single physical server, improving resource utilization and reducing hardware costs.
2. Desktop Virtualization: Hypervisors can be used to create and manage virtual desktops, enabling centralized management, improved security, and flexible access to desktop environments from various devices.
3. Cloud Computing: Hypervisors are a critical component of cloud computing infrastructures, enabling the creation and management of scalable virtual machine instances for hosting applications and services.
4. Containerization: Some hypervisors support containerization technologies, such as Docker, which allow for lightweight virtualization and efficient resource utilization.
5. Embedded Systems: Hypervisors can be used in embedded systems and Internet of Things (IoT) devices to provide virtualization capabilities and isolate critical components or guest operating systems.
6. Security and Compliance: Hypervisors play a crucial role in security and compliance by providing isolation, controlled access, and monitoring capabilities for virtual machines, making it easier to meet regulatory requirements.
Hypervisors are essential components of modern computing environments, enabling efficient resource utilization, workload consolidation, and secure execution of multiple operating systems and applications on a single physical host.
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