I often hear or see some words that cannot smile bitterly: vps Virtual host , vps cloud The server 、 Vps virtual machine 、 Vps host , vps virtual machine, vps special server, virtual special server, virtual machine, cloud server, cloud vps, server, independent server, bare metal server, etc. Moreover, the number of words mentioned is still very high. Although no one specifically asked, the host evaluation is willing to do some simple science popularization here. Welcome to correct!
Personal explanation
host : refers to the physical machine, including the chassis and the motherboard, CPU, memory, etc. in the chassis
The server : It includes the physical host and the ability to provide computing or application services
Virtual host : Rely on the entity of the host, and then divide the resources. Each is relatively independent
VPS : is the abbreviation of Virtual private server, which is translated as "virtual private server"
The webmaster first explains the above four words, and we should also see that these four words have a certain level of logic:
The server provides computing or application services on the basis of the host,
A virtual host is a resource allocation based on the server,
Strictly speaking, VPS is a form of virtual host.
cloud : To provide dynamically scalable and virtualized server resources through the Internet, can we find that there are more "dynamically virtualized server resources through the network" than the previous "virtual host" and "VPS"? Can we say that the essence of cloud is VPS or virtual host?
Bare metal server : Bare Metal Server, in essence, is a "server", but a computing service that combines the flexibility of virtual machines with the performance of physical machines.
What is the difference between cloud and VPS?
Cloud, which provides dynamic and easy to expand and virtualized server resources, does not say that the resources are from a single physical machine, that is, resources on a single machine or multiple machines can be called. VPS， Resources limited to a single machine. VPS hangs up when a single machine fails; The cloud can avoid such problems.
"Cloud" and "bare metal server" look like that, don't they?
Yes, it is very similar. From a practical point of view, their key difference is in performance, that is, the amount of resources allocated. In most cases, the cloud is shared, while in most cases, the "bare metal server" is exclusive, because it has more powerful performance.
A few things to note ：
Root permission : Not given, not qualified to call VPS, ECS, or server
shared hosting : Domestic "virtual host" and host space are in a mess. They can be created by VPS, ECS, and servers (independent) without root permission.
Cloud has extension function : That is to say, we will charge you as much as you use according to the demand; However, some domestic and foreign businesses like to charge for fixed resources, such as fixed memory, CPU, bandwidth, and traffic.
Well, let's not worry about other strange words. We just need to recognize the core essence. We just change our names.
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