An instance is a Cloud Virtual Machine (CVM). It contains basic computing components such as the CPU, the memory, the operating system, the network, and the disk.
CVM instances provide elastic computing services in the cloud in a secure and reliable way to meet computing requirements. As business demands change, computing resources can be scaled in real time to lower your software and hardware costs and simplify IT OPS work.
Each instance type offers different computing and storage capabilities, making them suitable for different use cases. You can choose the computing capacity, storage, and network access method of the instance based on the scope of the service you need to provide. For more information about instance types and use cases, see Instance Types. After you launch an instance, you can use it as you would any traditional computer. You will also have complete control over your instances.
An Image is a template that contains software configurations (operating systems, pre-installed programs, etc.) required for launching CVM instances. You can use an image to launch an instance or multiple instances repeatedly. In other words, an image is the “installed disk” of the CVM.
Tencent Cloud provides the following types of images:
Similar to a normal CVM, instances can be stored in the system disk and the data disk:
System disk: similar to the C drive in the Windows system. The system disk contains a full copy of the image used to launch an instance and the running environment for the instance. A system disk larger than the used image is required when an instance is launched.
Data disk: similar to the D and E drives in the Windows system. The data disk saves user data and supports flexible expansion, mounting, and unmounting.
Both the system disk and the data disk support different types of storage provided by Tencent Cloud. For more information, please see Storage Overview.
Tencent Cloud provides the following instance security protection methods: