Updated on 2024-05-20 GMT+08:00

Buying a Cluster Instance

This section describes how to buy a cluster Redis instance on the GeminiDB console.

Each tenant can have up to 50 GeminiDB Redis instances by default. To create more instances, contact customer service.


  • You have registered a Huawei Cloud account.


  1. Log in to the management console.
  2. In the service list, choose Databases > GeminiDB Redis API.
  3. On the Instances page, click Buy DB Instance.
  4. On the displayed page, specify a billing mode and instance specifications and click Next.

    Table 1 Billing mode description



    Billing Mode

    Select Yearly/Monthly or Pay-per-use.

    • Yearly/Monthly
    • Pay-per-use
    Table 2 Basic information




    The region where the instance is deployed.


    To reduce network latency, deploy your instance in the region nearest to your workloads. Instances deployed in different regions cannot communicate with each other over a private network. After you buy an instance, you cannot change its region.

    DB Instance Name

    The instance name:

    • Can be the same as an existing instance name.
    • Can include 4 to 64 bytes and must start with a letter. It is case-sensitive and allows only letters, digits, hyphens (-), and underscores (_).

    You can change the name of an instance after it is created. For details, see Modifying the Name of an Instance.

    Compatible API


    DB Instance Type


    With a sharded cluster architecture, this type of instance supports connections through proxies and is compatible with Redis clusters. It offers strong horizontal expansion capability, supporting millions of QPS and dozens of TB-level services.

    Compatible Version

    6.2, 5.0, and earlier


    Availability zone where the instance is created. An AZ is a part of a region with its own independent power supplies and networks. AZs are physically isolated but can communicate with each other over a private network.

    Instances can be deployed in a single AZ or three AZs.

    • If low network latency is required, deploy your instance in one AZ.
    • If disaster recovery is required, select three AZs, and nodes of your instance will be evenly distributed across the three AZs.
    Figure 1 Specifications and storage
    Table 3 Specifications and storage



    Instance Creation Method

    Two options are available:

    • Fast configure

      Provides you with recommended specifications. You can select one of them based on service requirements, without the need to specify the specifications, node quantity, and storage space.

      • Instance specifications with the memory of 8 GB and 16 GB are available only in single AZs. The console shows available specifications.
      • The QPS is only for reference.
    • Standard configure

      Provides a standard process to configure instance specifications, including specifying the specifications, node quantity, and storage space.

      For details, see How Do I Select Specifications and Nodes When Creating a GeminiDB Redis Instance?.

    Static Data Encryption

    You can select to enable disk encryption based on service requirements.

    • Disabled: Data storage is not encrypted.
    • Enabled: Data store is encrypted. If you select this option, your data will be encrypted on disks and stored in ciphertext after you create a DB instance. When you download encrypted objects, the ciphertext will be decrypted into plaintext and then sent to you. Disk encryption can improve data security and may have slight impacts on database writes and reads.

      Key Name: Select an existing key or create one.

      • This function is in the open beta test (OBT) phase. To use this function, contact customer service.
      • An agency will be created after disk encryption is enabled.
      • After an instance is created, the disk encryption status and the key cannot be changed.
      • The key cannot be disabled, deleted, or frozen when it is in use. Otherwise, the database becomes unavailable.
      • For details about how to create a key, see "Creating a Key" in Data Encryption Workshop User Guide.

    Load Balancer IP Address

    This option is selected by default and cannot be changed.

    After an instance is created, you can use the load balancer address to connect to the instance. For details, see Connecting to an Instance Using a Load Balancer Address (Recommended).

    Table 4 Network




    The virtual network where the instance is created. A VPC isolates networks for different services. You can select an existing VPC or create one.

    For details about how to create a VPC, see "Creating a VPC" in Virtual Private Cloud User Guide.

    If there are no VPCs available, the system allocates resources to you by default.

    • After a GeminiDB Redis instance is created, its VPC cannot be changed.
    • If you want to connect to a GeminiDB Redis instance through an ECS over an internal network, the GeminiDB Redis instance and the ECS must be in the same VPC. If they are not in the same VPC, you can create a VPC peering connection to enable access.


    A subnet where your instance is created. The subnet provides dedicated and isolated networks, improving network security.


    Create an IPv4 subnet or select an existing one. IPv6 subnets are not supported.

    Security Group

    A security group controls access between GeminiDB Redis instances and other services. Ensure that the security group you selected allows your client to access the instance.

    If there are no security groups available, the system allocates resources to you by default.


    A security protocol. Secure Sockets Layer (SSL) certificates set up encrypted connections between clients and servers, preventing data from being tampered with or stolen during transmission.

    You can enable SSL to improve data security. After an instance is created, you can connect to it using SSL.


    If SSL is not enabled when you create an instance, you can enable it after the instance is created. For details, see Configuring an SSL Connection.

    Database Port

    Port number for accessing the instance

    You can specify a port number based on your requirements. The port number ranges from 1024 to 65535 except 2180, 2887, 3887, 6377, 6378, 6380, 8018, 8079, 8091, 8479, 8484, 8999, 12017, 12333, and 50069.

    If you do not specify a port number, port 6379 is used by default.

    If you want to use this instance for dual-active DR, set the port to 8635.


    You cannot change the database port after an instance is created.

    Table 5 Database configuration



    Database Password

    Password of the administrator account. The password:

    • Must be 8 to 32 characters long.
    • Can include two of the following: uppercase letters, lowercase letters, digits, and special characters: ~!@#%^*-_=+?
    • For security reasons, set a strong password. The system will verify the password strength.

    Keep your password secure. The system cannot retrieve it if it is lost.

    Confirm Password

    Enter the administrator password again.

    Enterprise Project

    This parameter is provided for enterprise users.

    An enterprise project groups cloud resources, so you can manage resources and members by project. The default project is default.

    Select an enterprise project from the drop-down list. For more information about enterprise projects, see Enterprise Management User Guide.

    Table 6 Password-free access configuration



    Password-Free Access

    Configure password-free access for a CIDR Block of the instance you want to access. After that, the password is not required the instance access.

    • Skip

      If you select Skip, you can set password-free access after the GeminiDB Redis instance is created. For details, see Enabling Password-Free Access.

    • Configure

      Enter a CIDR block that you want to enable password-free access for. A maximum of 30 password-free CIDR blocks can be configured.

    Table 7 Tags




    This setting is optional. Adding tags helps you better identify and manage your DB instances. Each instance supports up to 10 tags by default. To use more tags, contact customer service to apply for a quota of 20 tags.

    If your organization has configured a tag policy for GeminiDB Redis, you need to add a tag to the instance based on the tag policy. If the tag does not comply with the tag policy, the instance may fail to be created. Contact the organization administrator to learn details about the tag policy.

    A tag consists of a tag key and a tag value.

    • Tag key: Mandatory if the instance is going to be tagged

      Each tag key is unique for each instance. It can include up to 36 characters, including digits, letters, underscores (_), and hyphens (-).

    • Tag value: Optional if the instance is going to be tagged

      The value can contain up to 43 characters, including digits, letters, underscores (_), periods (.), and hyphens (-).

    After an instance is created, you can view its tags on the Tags tab and can also add, modify, or delete the tags. For details, see Managing Tags.

    Table 8 Required duration



    Required Duration

    The length of your subscription if you select Yearly/Monthly billing. Subscription lengths range from one month to three years.


    • By default, this option is not selected.
    • If you select this parameter, the auto-renew cycle is determined by the selected required duration.

  5. On the displayed page, confirm the instance details.

    • For yearly/monthly instances
      • If you need to modify the settings, click Previous to modify parameters.
      • If you do not need to modify the settings, read and agree to the service agreement, click Pay Now, and complete the payment.
    • For pay-per-use instances
      • If you need to modify the settings, click Previous to modify parameters.
      • If no modification is required, read and agree to the service agreement and click Submit.

  6. On the Instances page, view and manage the instance.

    After the creation is complete, the status changes to Available.

    You can click in the upper right corner of the page to refresh the instance status.