Step 1: Configure Basic Settings

Basic Settings

Log in to the ECS console and buy an ECS.
Select a region.
ECSs in different regions cannot communicate with each other over an intranet. For low network latency and quick resource access, select the nearest region.
Select a billing mode, Yearly/Monthly, Pay-per-use, or Spot pricing.
- In Yearly/Monthly billing mode, you can select a required duration. Then, the system deducts the fees incurred at one time based on the service price.
  
  Yearly/Monthly ECSs cannot be deleted. If such an ECS is no longer required, go to the Elastic Cloud Server page, click More in the Operation column of this ECS, and select Unsubscribe to unsubscribe it.
- In Pay-per-use billing mode, after configuring basic settings, you do not need to select a required duration. Then, the system deducts the fees incurred based on the service duration.
- In Spot pricing billing mode, your purchased ECS is billed based on the service duration at a lower price than that of a pay-per-use ECS with the same specifications. However, a spot ECS may be reclaimed at any time based on the market price or changes in supply and demand. For more information about spot ECSs, see Spot Pricing ECSs.
Select an AZ.
An AZ is a physical location that uses independent power supply and networks. AZs in the same region can communicate with each other over an intranet.
- To enhance application availability, create ECSs in different AZs.
- To shorten network latency, create ECSs in the same AZ.
Random AZ allocation is available on the console when you create an ECS. The system will use a hash algorithm to select an AZ as the default AZ based on your universally unique identifier (UUID).

The available ECS types and flavors vary depending on AZs. To view all supported ECS types and flavors on the cloud service platform, set AZ to Random. Then, the system automatically allocates an AZ according to your selected ECS flavor.

For example, S3 ECSs are available only in AZ 1; S2 ECSs are available in AZ 2 and AZ 3 and have been sold out in AZ 1. If you set AZ to Random, you can view both S3 and S2 ECSs. If you create an S3 ECS, the system automatically allocates it to AZ 1. If you create an S2 ECS, the system randomly allocates it to AZ 2 or AZ 3.
Set Spot Type.
This parameter is optional and is displayed only when Billing Mode is set to Spot pricing. You can select Spot or Spot block. For details, see Spot Pricing ECSs.
(Optional) Select a CPU architecture.
This configuration is displayed when you select By Type for Instance Selection.
- x86
  The x86 CPU architecture uses Complex Instruction Set Computing (CISC). Each instruction can be used to execute low-level hardware operations. There are a large number of instructions and the length of each instruction is different. Therefore, executing such an instruction is complex and time-consuming.
- Kunpeng
  The Kunpeng CPU architecture uses Reduced Instruction Set Computing (RISC). RISC is a microprocessor that executes fewer types of computer instructions but at a higher speed than CISC. RISC simplifies the computer architecture and improves the running speed. Compared with the x86 CPU architecture, the Kunpeng-based CPU architecture has a more balanced performance and power consumption ratio. Kunpeng features high density, low power consumption, high cost-effectiveness.
Set Specifications.
The cloud platform provides various ECS types for different application scenarios. You can choose from existing ECS types and flavors in the list. Alternatively, you can enter a flavor or specify vCPUs and memory size to search for the flavor suited to your needs.
- Before selecting an ECS type, learn about the introduction and notes on each type of ECSs. For details, see ECS Types.
- When purchasing an ECS, sold-out vCPU and memory resources cannot be selected. You can select Hide sold-out specifications to hide specifications that have been sold out.
Select an image.
- 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. You can configure the runtime environment or software in the public image as needed.
- Private image
  A private image is an image available only to the user who created it. It contains an OS, preinstalled public applications, and the user's private applications. Using a customized private image, you can create ECSs tailored to your needs in batches.
  
  For instructions about how to create a private image, see Creating a Private Image.
  
  You can also select an encrypted image. For more information about encrypted images, see Encrypting Images.
  - 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 using 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. Additionally, the SCSI, sharing attribute, and data encryption settings of the system and data disks cannot be modified during ECS creation.
  - If a full-ECS image is in Normal state but 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. Additionally, the SCSI, sharing attribute, and data encryption settings of data disks can be modified during ECS creation.
  - An ISO image created from an ISO file cannot be used to create ECSs. You need to install an OS and drivers on the ECS and use the 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 routes NIC interrupt requests among multiple vCPUs for higher network packets per second (PPS) and bandwidth.
    For details, see How Do I Enable NIC Multi-Queue for an Image?
- Shared image
  A shared image is a private image shared by another user.
- Marketplace image
  This parameter is available only when Billing Mode is set to Yearly/Monthly or Pay-per-use. Marketplace images are high-quality third-party images that have OSs, application environments, and software preinstalled. You can use the images to deploy websites and application development environments with a few clicks, and no additional configuration operation is required.
  
  If you use a Marketplace image, after you click Marketplace image, the system displays Marketplace images for you to choose from. For example, if the image product is name1 (test_001), name1 is the image name, and test_001 is the product name. You can search for your desired Marketplace image by image name or product name. Alternatively, you can click the image name to view more information about the image.
(Optional) Set Protection.
When using certain public images, you are advised to enable protection to improve the overall security for ECSs. HSS is designed to improve the overall security for ECSs. It reduces intrusion risks with asset management, vulnerability management, intrusion detection, and baseline inspection functions.
Select one of the following options:
- HSS basic edition (free): provides HSS basic edition (1-month free trial), account cracking protection, weak password detection, and malicious program detection.
  
  After the free trial period expires, the HSS basic edition quotas will be automatically released, and HSS will not protect your servers.
  
  If you want to retain or upgrade HSS security capabilities, you are advised to purchase HSS. For details, see Editions and Features.
  
  This option is selected by default.
- Advanced HSS edition (paid): provides HSS enterprise edition, vulnerability patches, virus scan and removal, and graded protection.
- None: Do not use security protection.
After you select an HSS edition, the system automatically installs the HSS agent, enables account cracking prevention, and offers host security functions.

HSS provides basic, enterprise, premium, and WTP editions. Switch between these editions on the HSS management console. For details about the differences among editions, see Editions Details.
(Optional) Set License Type.
Specifies a license type for using an OS or software. This parameter is displayed only when the selected image is billed.
- Bring your own license (BYOL)
  Allows you to use your existing OS license. In such a case, you do not need to apply for a license again.
For more information about license types, see License Types.
Set System Disk and Data Disk if required.
Disks are classified as EVS disks and DSS disks based on whether the storage resources used by the disks are dedicated. DSS disks allow you to use dedicated storage resources.
- If you have requested for a storage pool on the DSS page, click the DSS tab and create disks in the obtained storage pool.
- If you have not requested for a dedicated storage pool, click the Disks tab and create EVS disks that use public storage resources.
  When you use DSS resources to create a disk, the disk type must be the same as that of the requested storage pool. For example, both are of high I/O type.
  
  For more information about DSS, see Dedicated Distributed Storage Service.
- System disk
  For details about the disk types supported by ECS, see Disk Types and Performance.
  - If the image based on which an ECS is created is not encrypted, the system disk of the ECS is not encrypted. If the image based on which an ECS is created is encrypted, the system disk of the ECS is automatically encrypted. For details, see (Optional) Encryption-related parameters.
- Data disk
  You can create multiple data disks for an ECS and enable required functions for each data disk. When creating an ECS, you can add up to 23 data disks with customized sizes to it. After the ECS is created, you can add up to 23 VBD disks or 59 SCSI disks to it.
  
  Click Show and set the following functions if required:
  - SCSI: indicates that the device type of the data disk is SCSI if you select this option. For more information about SCSI disks and the ECSs that can be attached with SCSI disks, see Device Types and Usage Instructions.
  - Share: indicates that the EVS disk is sharable if you select this option. Such an EVS disk can be attached to multiple ECSs.
  - Encryption: indicates that the data disk is encrypted if you select this option. For details, see (Optional) Encryption-related parameters.
- (Optional) Encryption-related parameters
  To enable encryption, click Create Xrole to assign KMS access permissions to EVS. If you have rights granting permission, assign the KMS access permissions to EVS. If you do not have the permission, contact the user having the security administrator rights to assign the KMS access permissions.
  - Encryption: indicates that the EVS disk has been encrypted.
  - Create Xrole: assigns KMS access permissions to EVS to obtain KMS keys. After the permissions are assigned, follow-up operations do not require assigning permissions again.
  - Xrole Name: EVSAccessKMS: specifies that permissions have been assigned to EVS to obtain KMS keys for encrypting or decrypting EVS disks.
  - KMS Key Name: specifies the name of the key used by the encrypted EVS disk. You can select an existing key, or click Create KMS Key and create a new one on the KMS console. The default value is evs/default.
  - KMS Key ID: specifies the ID of the key used by the encrypted data disk.
If you detach the system disk purchased when you buy a yearly/monthly ECS and want to continue using it as a system disk, you can only attach it to the original ECS. If you want to use it as a data disk, you can attach it to any ECS.

If you detach the non-shared data disk purchased when you buy a yearly/monthly ECS and want to attach it again, you can only attach it to the original ECS as a data disk.

The data disk purchased when you buy a yearly/monthly ECS does not support separate renewal, unsubscription, automatic service renewal, conversion to pay-per-use payment, and release.
Click Next: Configure Network.