How Do I Select an Image?¶
When creating an ECS or a BMS, you can select an image based on the following factors:
Region and AZ¶
An image is a regional resource. You cannot use an image to create an instance in a different region. For example, when creating an instance in region A, you can only select an image that is already in region A. For more information, see Region and AZ.
Image Type¶
Images are classified into public images, private images, and shared images. A private image can be a system disk image, data disk image, or full-ECS image. For details, see What Is Image Management Service?
OS¶
When selecting an OS, consider the following factors:
Architecture types
System Architecture
Applicable Memory
Constraints
32-bit
Smaller than 4 GB
If the instance memory is greater than 4 GB, a 32-bit OS cannot be used.
A 32-bit OS only allows addressing within a 4 GB memory range. An OS with more than 4 GB memory cannot be accessed.
64-bit
4 GB or larger
If your application requires more than 4 GB of memory or the memory may need to be expanded to more than 4 GB, use a 64-bit OS.
OS types
OS Type
Applicable Scenario
Constraints
Windows
Programs developed for Windows (for example, .NET).
Databases such as SQL Server. (You need to install the database.)
The system disk must be at least 1 GB, and there must be at least 1 GB of memory.
Linux
High-performance server applications (for example, Web) and common programming languages such as PHP and Python
Databases such as MySQL. (You need to install the database.)
The system disk must be at least 1 GB, and there must be at least 512 MB of memory.