The trio of ghost blowing lights in server virtualization technology: KVM, XEN, OVZ

There must be many netizens like me waiting for the update early every time for the popular online drama Ghost Blowing the Lamp: The Ancient City. The plot of this web drama is very concise and attractive, and the characters in it are also very distinctive. When I saw the easter egg in the last episode, I was really looking forward to the next one in the summer.

In the server industry, Linux is as popular as ghost blowing lights. The main virtual technologies KVM, XEN, and OVZ also have their own characteristics like the three protagonists.

Protagonist+Professional

In the online drama, Hu Ba has traveled to the countryside, carried a gun, climbed over snowy mountains and fought in battles. From a professional perspective, he is also the authentic descendant of Captain Mo Jin. The same goes for KVM virtualization technology. In the VPS industry now, KVM is definitely the mainstream, and big names such as linode vultr do have embraced KVM. And technically speaking, KVM is truly "virtual" a separate server. Programs that can be used on the server can be used normally in the KVM virtual VPS. So some people have used KVM to engage in the business of "chickens giving birth to chicks".

After Hu Bayi retired from the army, he was forced to work with Fatty to dig up ancient tombs, but he was not greedy for money and only took what he deserved. The same is true for KVM. Although some use large memory to generate multiple VPSs and sell them, KVM virtual VPSs are always more practical and rarely oversold. Not like a fat man.

Greed, greed, greed

OVZ is the abbreviation of OpenVZ. OpenVZ virtual technology is just like a fat man, it is greedy, greedy and fat. To put it bluntly, servers using OpenVZ virtual technology are oversold. One more is sold, and one more is earned. If you are greedy for too much, you will suffer losses. The stability of VPS can be imagined, unless you are an expert (such as a bricklayer).

Another major shortcoming of OpenVZ virtual technology is that it cannot be fully virtualized because it uses virtual technology on the underlying operating system. It is just like Fatty and is very unprofessional. Many things such as Ruisu and BBR cannot be used.

Smart and beautiful

XEN is just like Yang, smart, beautiful and professional. Yang is regarded as the descendant of the Mojin Colonel who went to a foreign country. Although he is professional, he has no use in the United States. The same goes for XEN virtualization technology, which is rarely overbooked and has a lot of software support. But after all, he is not the male protagonist, and his experience is not that rich, or not as rich as Hu Bayi's.

Precisely because XEN requires less effort (such as installing windows), although it is very stable, it is in the minority. Many previously loyal users have switched to KVM (yes, I am talking about linode). Now basically only Hong Kong VPS is used more. After all, more people use Hong Kong VPS to build websites. Less hassle means stability.

Of course, no matter it is Hu Bayi, Fatty or Yang. There are always fans who like it. You only know whether it’s good or not, right? !

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