How Do I Select an Image?
When creating an ECS or 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 regions, see Region and AZ.
If you want to use an image in another region to create an instance, copy the image to the current region first. For details, see Replicating Images Across Regions.
Image Type
Images are classified into public, private, Marketplace, and shared images.
Image Type |
Description |
Availability/Security |
Billing |
---|---|---|---|
Public image |
A public image is a standard, widely used image. It contains an OS and preinstalled public applications and is available to all users. Public images are very stable and their OS and any included software have been officially authorized for use. |
High |
Free |
Marketplace image |
The Marketplace is an online store where you can purchase third-party images that have the OS, application environments, and software preinstalled. You can use these images to deploy websites and application development environments in just a few clicks. No additional configuration is required. |
Medium high |
Free/Charged |
Private image |
A private image contains an OS or service data, preinstalled public applications, and a user's personal applications. Private images are only available to the users who created them. |
Medium |
Free |
Shared image |
A shared image is a private image another user has shared with you. |
Low |
Free |
You can select an image as follows:
- If you only need an OS, select a public image.
- If you need a complete software environment, such as a Magento e-commerce system, select a Marketplace image.
- If you want to clone an existing ECS, select a private image.
- If you want to use an image shared by others, select a shared image.
Image Fee
You may be billed for using an image. For details, see What Are the Billing Standards of IMS?
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 40 GB, and there must be at least 1 GB of memory.
Linux
- High-performance server applications (for example, Web) and working with 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 40 GB, and there must be at least 512 MB of memory.
Image Consulting FAQs
- Basic Concepts
- How Do I Select an Image?
- What Do I Do If I Cannot Find a Desired Image?
- What Do I Do If I Want to Set Up an OpenVPN or PyTorch Environment But No Public Images Containing OpenVPN or PyTorch Are Available?
- How Do I Increase the Image Quota?
- What Are the Differences Between Images and Backups?
- Can I Tailor an Image?
- How Do I Migrate an ECS to a Different Region of Another Account?
- How Can I Back Up the Current Status of an ECS for Restoration in the Case of a System Fault?
- How Can I Apply a Private Image to an Existing ECS?
- Can I Import Data from a Data Disk Image to a Data Disk?
- Can I Use Private Images of Other Tenants?
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