What is the difference between VPS and cloud server?

Question

　The Essence of VPS

　VPS is a form of shared server hosting in which each customer has their own dedicated virtual machine for storing data and hosting websites and applications. They have their own dedicated CPU, RAM and storage, their own dedicated operating system and software, and the freedom to use virtual machines like any other remote server.

Does it sound similar to a cloud server? However, with a VPS, your virtual environment will always be located on this specific physical server that is shared with other VPS customers. Therefore, there are bound to be significant limits on the amount of resources that can be consumed between tenants, and a failure at the hardware or hypervisor layer will affect everyone.

The essence of cloud server

Compared with VPS, the real cloud environment has no such restrictions and no single point of failure. On the contrary, cloud servers are composed of multiple server hardware resources concentrated in a cluster to form a virtual resource pool, and finally schedule and allocate resources to all tenants in the cloud.

This means that if a customer needs a more powerful server or more storage, they can scale more easily because they don't need to compete for the CPU, memory and storage resources of a particular physical server. . If the entire cloud environment is running out of resources, the cloud server provider can simply add more hosts and more storage devices to the cluster to support this growth.

It also means tenants are better protected against downtime and unplanned interruptions, as any virtual machines hosted on a failed server will be seamlessly and automatically moved to another host and continue to operate normally.