Introduction to the Instance
Instance, which can be regarded as Cloud Virtual Machine (CVM), contains the most fundamental computing components such as CPU, memory, operating system, network, and disk.
CVM instances can offer secure and elastic computing services in the cloud to fulfill computing requirements. The instances can expand or contract computing resources in real time as the business needs change. They can significantly reduce the company's software and hardware procurement costs and simplify IT operation and maintenance work.
Different instance types offer different computing and storage capabilities and are applicable to different use cases. Users can select the computing capability, storage and network access mode of the instance according to the scale of the services they need to offer. After the instance is started, the user can use it like a traditional computer, and the user has full control over the instance.
Image of Instance
Image It is a template for configuring the Cloud Virtual Machine software (operating system, pre-installed programs, and etc.). An image provides all the information required to start a Cloud Virtual Machine instance. Requires users to start instances through images. The image can start multiple instances for users to use repeatedly. In layman's terms, an image is the installation disk of Cloud Virtual Machine.
The images include the following types.
- Public images: Available to all users, and applicable to most mainstream operating systems.
- Custom images: Only available to the creator and users that share the images, and the images are created by existing running instances or imported from external sources.
- Shared images: Images offered by other users, which can only be used to create instances.
Storage of Instance
The storage of the instance is similar to that of an ordinary Cloud Virtual Machine, and it includes a system disk and a data disk.
- System disk: Similar to the C Drive in the Windows system. The system disk contains a complete copy of the image used for starting the instance, as well as the instance operating environment. Before starting up, you must select a system disk size that is larger than that of the used image.
- Data disk: Similar to the D Drive and E Drive under the Windows system. The data disk stores the user data and supports free expansion, mounting and unmounting.
Both system disks and data disks can use different storage types provided by the cloud platform.
Instance Security
The instance security protection means provided by Converge Cloud are as follows.
- Policy control: When the same set of cloud resources needs to be controlled by multiple different accounts, users can use policy control to manage access permissions to cloud resources.
- Security group: Control access by using security groups to allow trusted addresses to access instances.
- Log In control: Use SSH keys whenever possible to log in to the user's Linux instance, and use password to log in to the instance that needs to change the password from time to time.