Cloud application processing method, cloud application deployment method, and related apparatus and system

A cloud service provider (CSP) server, comprising:

• a processor;
• and
• a memory coupled to the processor and configured to store a code, the processor, by calling the code in the memory, being configured to:
• receive an application deployment request comprising:
• an emergency policy corresponding to a first application, the emergency policy describing that the first application and a second application have an emergency relationship;
• and
• a host-on relationship template that describes a host-on relationship between the first application and a third application, the host-on relationship being either that the first application is hosted on the third application or the first application and the third application are mutually hosted on each other;
• determine that a working state of a first virtual machine satisfies a condition for adding a virtual machine;
• determine, according to the emergency policy corresponding to the first application running on the first virtual machine, the second application that has the emergency relationship with the first application;
• deploy, on a second virtual machine, the third application that has the host-on relationship with the first application;
• instruct the second virtual machine on which the second application is hosted to run the first application deployed on the second virtual machine;
• create a third virtual machine;
• deploy and start the first application on the third virtual machine;
• and
• instruct the second virtual machine to stop running the first application after the first application is started on the third virtual machine.