Što je virtualizacija

Summary

Kaye Bovie from IBM Cloud discusses virtualization, a technology that remains crucial for cloud computing. Virtualization involves creating virtual versions of compute, storage, and networking resources using a hypervisor. There are two types: Type 1 (bare metal) for direct installation on servers and Type 2 (hosted) that requires a host OS. Virtual Machines (VMs) are independent software-based computers that run on hypervisors, allowing for cost savings, increased agility, and reduced downtime by easily moving VMs between hypervisors.

Takeaways

• 🌐 **Virtualization Defined**: Virtualization is creating a software-based or virtual version of resources like compute, storage, networking, servers, or applications.
• 🛠️ **Role of Hypervisor**: The hypervisor is essential software that runs above the physical server, pulling resources from it and allocating them to virtual environments.
• 💻 **Type 1 Hypervisor**: Type 1 hypervisors, or bare-metal hypervisors, are installed directly on the physical server and are known for their security and low latency.
• 🖥️ **Type 2 Hypervisor**: Type 2 hypervisors, or hosted hypervisors, sit on top of a host OS and are used mostly for end-user virtualization with higher latency.
• 🔑 **Examples of Hypervisors**: Examples include VMware ESXi, Microsoft Hyper-V, and open-source KVM for Type 1, and Oracle VirtualBox or VMWare Workstation for Type 2.
• 📦 **Virtual Machines (VMs)**: VMs are software-based computers that run like physical ones, complete with their own OS and applications, and are independent of one another.
• 🔄 **Portability of VMs**: VMs can be moved almost instantaneously from one hypervisor to another, providing flexibility and ease of portability.
• 💹 **Cost Savings**: Virtualization allows for running multiple virtual environments from one piece of infrastructure, reducing the physical infrastructure footprint and saving costs.
• ⏱️ **Agility and Speed**: Virtual machines can be spun up quickly, providing agility and speeding up processes like development and testing.
• 🛡️ **Reduced Downtime**: The ability to move VMs to another hypervisor in case of host failure ensures minimal downtime and a robust backup plan.

Q & A

What is virtualization?

Virtualization is the process of creating a software-based or virtual version of something, such as compute, storage, networking, servers, or applications.

What role does a hypervisor play in virtualization?

A hypervisor is a piece of software that runs above the physical server or host, pulling resources from the physical server and allocating them to virtual environments.

What are the two main types of hypervisors mentioned in the script?

The two main types of hypervisors are Type 1 (also known as bare-metal hypervisors) and Type 2 (also known as hosted hypervisors).

What is a Type 1 hypervisor and why is it considered more secure?

A Type 1 hypervisor is installed directly on top of the physical server without any host operating system in between. It is considered more secure and has lower latency, making it the most frequently used type in the market.

Give some examples of Type 1 hypervisors.

Examples of Type 1 hypervisors include VMware ESXi, Microsoft Hyper-V, and open-source KVM.

How does a Type 2 hypervisor differ from a Type 1 hypervisor?

A Type 2 hypervisor has a layer of host OS that sits between the physical server and the hypervisor, making it less frequent and having higher latency compared to Type 1.

What are some examples of Type 2 hypervisors?

Examples of Type 2 hypervisors include Oracle VirtualBox and VMware Workstation.

What is a VM and how does it relate to virtualization?

A VM (virtual machine) is a software-based computer that runs like a physical computer, complete with an operating system and applications. It is independent and can run on a hypervisor, which manages the resources allocated to it.

Why are virtual machines considered portable?

Virtual machines are portable because they can be moved from one hypervisor to another on a different machine almost instantaneously, providing flexibility and portability within the environment.

What are the key benefits of virtualization mentioned in the script?

The key benefits of virtualization include cost savings through reduced physical infrastructure, agility and speed in spinning up virtual machines, and lower downtime due to the ability to quickly move VMs to another hypervisor in case of host failure.

How does virtualization contribute to a cloud computing strategy?

Virtualization contributes to a cloud computing strategy by providing a foundation for building scalable, flexible, and efficient infrastructure that can support various applications and services in the cloud.