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This article mainly introduces what are the three commonly used virtualization technologies in the Internet, which has a certain reference value. Interested friends can refer to them. I hope you will gain a lot after reading this article. Let's take a look at it.

At present, there are three common virtualization technologies: 1, OpenVZ, operating system-level virtualization technology, which is more flexible to configure; 2, Xen, is a semi-virtualization technology, which can freely load kernel modules, virtual memory and IO;3, KVM, completely virtual, and supports any type of operating system.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

At present, there are three common virtualization technologies: OpenVZ,Xen,KVM.

OpenVZ (easily oversold)

Operating system-level virtualization technology is a layer of application on the operating system, which means easy to understand and heavy overhead. The configuration is more flexible (this gives unscrupulous service providers the opportunity to lower the limit.)

Cons: because it is operating system-based virtualization, you will be less if others use more. After the memory is down, the downtime is very unstable.

Advantages: the service provider licensed memory and CPU are very good.

Xen

It's a paravirtualization technology, and it's not a real virtual machine. It is equivalent to running a kernel instance and is free to load kernel modules, virtual memory and IO. Xen+hvm and Xen+hvm pv only support linux hvm and support win system

Advantages: exclusive memory, although small but all allocated to. No matter how low the memory is, there will be no downtime and there will be no response for some time.

Disadvantages: small memory, small hard disk, small bandwidth. Pv has better performance.

KVM

Advantages: completely virtual, regardless of pv and hvm. Any type of operating system is supported.

Check the performance of the native VPS to determine whether it is oversold.

The oversold method of openVZ VPS:

Cd / dev/shm

Dd if=/dev/zero of=./memtest bs=1M count = 100 100MB / the file that creates it

View memory:

Free-m

Constantly increase the value of count in the specified range (the range you buy). If the machine goes down within the promised content, it is very oversold.

Don't forget to delete the file you just created after testing. / rm. / memtest

View CPU information

Cat / proc/cpuinfo

Disk IO test command

Dd if=/dev/zero of=test bs=64k count=512 oflag=dsync

1) View process memory footprint

Top

2) View CPU information

Cat / proc/cpuinfo

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