What is a virtual machine? What is a virtual machine

A virtual machine is a complete computer system running in a completely isolated environment with full hardware system functions simulated by software. Each virtual machine has its own CMOS, hard disk, and operating system, and can be operated on the virtual machine as if it were a physical machine.

Virtual machine, as the name suggests, is a virtual computer, this virtual computer is almost exactly the same as the real computer, the difference is that his hard disk is virtualized in a file, so you can modify the settings of the virtual machine at will, without worrying about the loss of your computer, so it can be used to do experiments or something, hehe, that's pretty much it, I don't know if what I said can understand it is simply a sentence, the virtual computer, you can do anything. Now let's talk about the software of virtual machines, mainly two, virtual PC and VMware. The choice of software is also a doorway, hehe, in short, the setting of the VPC is very simple, all the way to the next line, the VM setting is relatively troublesome, but it is not a lot of trouble, but the VM has better performance, it can be said that it is exactly the same as the real computer performance, and it can also be interconnected with the current computer in a bridging way There are more things that can be studied.

A virtual machine is a piece of software that is installed on your existing system! You can create all kinds of new systems with this! And then make the corresponding system inside!

A virtual machine is software that emulates the hardware of a computer.

A virtual machine (VM) is a virtual environment created on a physical hardware system (external or internal) that acts as a virtual computer system, emulating its entire set of hardware, including CPU, memory, network interfaces, and storage. With software called a hypervisor, users can separate the machine's resources from the hardware and provision them appropriately for the virtual machine to use.

A physical machine equipped with a hypervisor is known as a master machine, a host computer, a host operating system, or simply a host. The hypervisor treats compute resources, such as CPU, memory, and storage, as a set of resources that can be reallocated between existing virtual clients or to new virtual machines.

The usefulness of virtual machines

Virtual machines are isolated, independent of the rest of the system, and there can be multiple virtual machines on a single piece of hardware, such as a server. You can move these virtual machines between host servers as you see fit, making more efficient use of resources.

Virtual machines allow multiple different operating systems to run on a single computer at the same time, such as a Linux distribution on a macOS laptop. Each operating system operates in the same way as a typical operating system or application would run on host hardware, so the end-user experience you get in a virtual machine is virtually indistinguishable from the real-time OS experience on a physical machine.

I often hear the term virtual machine every day, in fact, in life, virtual machine is quite common, so let's introduce what virtual machine is.

1. Virtual machine (English full name: virtual machine) refers to a complete computer system running in a completely isolated environment through software simulation with complete hardware system functions, and the current popular virtual machine software includes VMware (VMware ACE), virtual box and virtual PC, which can virtualize multiple computers on the Windows system, and each virtual computer can run independently. You can install a variety of software and applications.

2. The role of virtual machine in reality is still quite large, for example, there is no optical drive in our computer in the simplest way, if you want to install the system, you can use a virtual machine to install the system, the virtual machine has a virtual optical drive inside, and it supports directly opening the system image file to install the system, in addition, the virtual machine technology is also quite practical in the eyes of game enthusiasts, for example, many games on a computer do not support multiple openings at the same time, but we can create a few more virtual machines in the computer, Then you can run the program separately in the virtual machine system, so that you can open the same game on one computer at the same time.

3. In fact, virtual machines are very widely used in enterprises, because the server is usually very high, because many server network providers in order to meet the needs of small and medium-sized webmasters, usually divide a server into a plurality of virtual machine servers, so that each can allocate a part of independent server resources, and do not affect each other and can be equipped with independent IP addresses, which greatly solves the problem of high cost of small and medium-sized enterprises using separate servers. The same principle is the virtual space that my friends used in the early days.

That's all for what a virtual machine is.

Through virtual machine software, one or more virtual computers are simulated on a physical computer, and the virtual machine works like a real computer, installing operating systems, installing applications, accessing network resources, and so on.

An application that runs on your physical computer, an application that runs in a virtual machine, works in a real computer. When the software is evaluated in the virtual machine, the system will crash, only the operating system on the virtual machine will be crashed, not the operating system on the physical computer, and the "undo" function of the virtual machine will immediately restore the virtual machine to the state before the software was installed.

Popular virtual machine software such as VMware (VMware ACE) and Virtual PC can virtualize multiple computers on Windows and install other operating systems such as Linux, OS 2, FreeBSD, etc. Microsoft in February 2003. Virtual machine software, a physical computer emulates one or more virtual computers, and the virtual machine works exactly like a real computer.

Install the operating system, install applications, access network resources, and much more. An application running on your physical computer, in the case of an application running in a virtual machine, works on a real computer.

When the software is evaluated in the virtual machine, the system will crash as well, and only the operating system on the virtual machine will crash, not the operating system on the physical computer, and the virtual machine will be restored to the state before the software was installed immediately using the "undo" function of the virtual machine. Popular virtual machine software such as VMware (VMware ACE) and Virtual PC can virtualize multiple computers on Windows for installing other operating systems such as Linux, OS 2, FreeBSD, etc.

Microsoft released Microsoft Virtual PC 2004 after acquiring Connectix in February 2003. Due to various considerations, the newly released Virtual PC 2004 no longer explicitly supports operating systems such as Linux, FreeBSDNetware, Solaris, etc., and only retains OS 2. In contrast, VMware is significantly better than Virtual PC 2004 in terms of multi-OS support and execution efficiency.

One computer becomes two, and there is no longer any worry about learning to use Linux.

In fact, the virtual machine is to virtualize a computer to realize the function of a computer with multiple computers, but the performance of the whole machine will also be allocated by each virtual machine, so the more virtual machines are divided, the less CPU, memory, and storage space resources are allocated by each virtual machine, so the formation of virtual machines is usually the higher the configuration, the better, so it is widely used in server and other industries.

What is a virtual machine used for? The role of virtual machines in ordinary life and work is still quite large, for example, there is no optical drive in the simplest of our computers, if we want to install the system, we can use virtual machines to install the system, the virtual machine has a virtual optical drive inside, and it supports directly opening the system image file to install the system, in addition, the virtual machine technology is also quite practical in the eyes of game lovers and friends, for example, we know that many games on a computer do not support multiple openings at the same time, but we can create a few more virtual machines in the computer, Then you can run the program separately in the virtual machine system, so that you can open the same game on one computer at the same time. In addition, virtual machines have many functions, such as virus analysis and so on.

In fact, virtual machines are also widely used in enterprises, because the server is usually very high, because many server network providers in order to meet the needs of small and medium-sized webmasters, usually divide a server into a plurality of virtual machine servers, so that each can allocate a part of independent server resources, and do not affect each other and can be equipped with an independent IP address, which greatly solves the problem of high cost of small and medium-sized enterprises to use a single server, and the VPS servers currently purchased are all using this technology, I believe that the webmasters know more about the use of virtual machines.

With virtual machine software, you can simulate one or more virtual computers on a physical computer that work exactly like a real computer, such as installing an operating system, installing applications, accessing network resources, and so on. For you, it's just an application running on your physical computer, but for an application running in a virtual machine, it's like working in a real computer.

In fact, it is a simulated environment for software programmers to test software or systems, and of course it can also be used to install some toxic software, or remote software.

In the existing operating system, the operating system can be installed on a virtual set of hardware devices.

iouh virtual machine is very complicated, and it will not be clear here for a while, you can go to the sugar moon seller forum to find a virtual machine-related learning a third party.