Purchasing an ECS Using a Private Image

Scenarios

A private image is a personal image created or imported by a user and is visible only to the user who created or imported it. It contains an OS, preinstalled public applications, and the user's personal applications, saving the time for configuring the ECS repeatedly.

The difference between ECSs created using public and private images is as follows:

• ECSs created using public images contain only the OS and pre-installed public applications. You need to install your personal applications if required.
• ECSs created using private or shared images contain the OS, pre-installed public applications, and your personal applications.

You can also use an encrypted image to create ECSs. For details, see Encrypting Images.

Notes and Constraints

• If you use a full-ECS image to create an ECS, the EVS disks associated with the full-ECS image do not support the function of creating disks from a data disk image.
• If a full-ECS image is in Normal state and the system displays message "Available in AZx", the full-ECS image can be used to create ECSs in this AZ only, and the encryption attributes of the system and data disks of the created ECSs are the same as those of the system and data disks specified in the full-ECS image. The SCSI, encryption, and sharing attribute settings of the system and data disks cannot be modified during ECS creation.
• If a full-ECS image is in Normal state and the system does not display message "Available in AZx", the full-ECS image can be used to create ECSs in the entire region, and the encryption attributes of the system and data disks of the created ECSs are the same as those of the system and data disks specified in the full-ECS image. The SCSI, encryption, and sharing attribute settings of data disks can be modified during ECS creation.
• An ISO image created from an ISO file cannot be used to create ECSs. It can only be used to create a temporary ECS. You need to install an OS and drivers on the temporary ECS and use the temporary ECS to create a system disk image first.
• ECSs created from ISO images cannot be directly used because some functions like disk attachment are restricted.
• To ensure that NIC multi-queue is enabled on an ECS created using a private image, configure NIC multi-queue when creating such a private image. NIC multi-queue assigns interrupts for queues to different vCPUs for higher network packets per second (PPS) and bandwidth.

  For details, see How Do I Enable NIC Multi-Queue for an Image?

Procedure (on ECS Console)

1. Log in to the management console and go to the ECS console.
2. Click Buy ECS and specify parameters in Basic Configuration (Billing Mode, Region, and AZ) and Instance.
3. In the OS module, choose Private image for Image.
   Figure 1 Private image
   
4. Select a private image from the drop-down list.
5. Configure other parameters and complete the ECS purchase.

   For details, see Purchasing a Custom ECS.

Procedure (on IMS Console)

1. Log in to the IMS console and go to the private image list.
2. Locate the row that contains the target image and click Apply for Server in the Operation column. The Buy ECS page is displayed.
   Figure 2 Applying for a cloud server
   
3. On the displayed Buy ECS page, set required parameters.
   For details, see Purchasing a Custom ECS.

   

   • When creating an ECS using a system disk image, you can reset the ECS specifications and system disk type. The ECS's system disk size must be greater than that of the image.
   • If you use a private full-ECS image that contains one or more data disks to create an ECS, the system automatically sets the data disk parameters for the ECS. The capacity of the system and data disks can only be expanded. It cannot be reduced.
   • If a full-ECS image contains multiple data disks, it takes some time to load and display the disk information.

Follow-up Procedure

If an ECS is created using a private image, the password reset function may be unavailable because the private image may not have the password reset plug-in installed.

In this case, install the plug-in by referring to Installing the One-Click Password Reset Plug-in on an ECS.