Buying a Primary/Standby GeminiDB Redis Instance

Prerequisites

• You have created a Huawei Cloud account.

Procedure

1. Log in to the Huawei Cloud console.
2. In the service list, choose Databases > GeminiDB.
3. On the Instances page, click Buy DB Instance.
4. On the displayed page, select a billing mode, select instance specifications and click Next.
   Figure 1 Billing mode and basic information
   

   Table 1 Billing mode description

   Parameter

   Description

   Billing Mode

   Select Yearly/Monthly or Pay-per-use. Yearly/Monthly Specify Required Duration. The system deducts fees from your account based on the service price. If you do not need such an instance any longer after it expires, change the billing mode to pay-per-use. For details, see Changing a Yearly/Monthly Instance to Pay-per-Use. NOTE: Yearly/Monthly instances cannot be deleted directly. If such an instance is no longer required, unsubscribe from it. For details, see How Do I Unsubscribe from a Yearly/Monthly Instance?. Pay-per-use If you select this billing mode, you are billed based on how much time the instance is in use. To use an instance for a long time, change its billing mode to yearly/monthly to reduce costs. For details, see Changing a Pay-per-Use Instance to Yearly/Monthly.

   Table 2 Basic information

   Parameter	Description
   Region	Region where a tenant is located NOTE: To reduce network latency, select a region nearest from which you will access the instance. 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 contain 4 to 64 characters 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 a GeminiDB Redis Instance Name.
   Compatible API	Redis GeminiDB is compatible with mainstream NoSQL databases, including Redis, DynamoDB, Cassandra, HBase, MongoDB, and InfluxDB. You can select GeminiDB APIs by following How Do I Select an API?
   Storage Type	Classic: classic architecture with decoupled storage and compute
   Product Type	Standard: Stable and low-latency performance is provided for common scenarios such as advertising and recommendation, gaming, e-commerce, and Internet of Vehicles (IoV).
   DB Instance Type	Primary/Standby A primary/standby instance is compatible with a standalone Redis node and Redis Sentinel. This instance type is used when hashtags are unavailable.
   Compatible Version	7.0, 6.2 (including 6.2.X), 5.0, and earlier versions
   CPU Type	x86 x86 CPUs use the Complex Instruction Set Computing (CISC) instruction set. Each instruction can be used to execute low-level hardware operations. Executing these instructions is complex and time-consuming.
   AZ	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. If there are multiple AZs, you need to select primary and standby AZs. Instances can be deployed in a single AZ or three AZs. If low network latency is required, deploy your instance in one AZ. To meet disaster recovery requirements, select three AZs and specify primary and standby AZs. Primary AZ: AZ where a primary node is located Standby AZ: AZ where a standby node is located

   Figure 2 Specifications and storage
   

   Table 3 Specifications and storage

   Parameter	Description
   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. NOTE: 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.
   Instance Specifications	You need to specify instance specifications after selecting Fast configure for Instance Creation Method. Higher CPU specifications provide better performance. Select specifications as needed. For details, see Instance Specifications.
   Specification Type	You need to select a specification type after selecting Standard configure for Instance Creation Method. Standard: The default and recommended CPU-to-memory ratio is 1:4, which balances low latency demands with high concurrency requirements.
   Node Specifications	You need to select node specifications after selecting Standard configure for Instance Creation Method. For details, see Instance Specifications.
   Nodes	The default value is 2. One is the primary node and the other is standby. If there is a fault, the primary and standby nodes can automatically switch over.
   Total Storage Space	You need to specify the storage space after selecting Standard configure for Instance Creation Method. Higher CPU specifications provide better performance. Select specifications as needed. For details, see Instance Specifications.
   Specification Preview	After you select instance specifications, the system automatically shows details of the total capacity, node specifications, number of nodes, QPS benchmark, total number of connections, and number of data copies. This helps keep track of the selected instance specifications.
   Autoscaling	You can determine whether to enable the function based on the site requirements. Trigger If Available Storage Drops To: If the storage usage exceeds the specified value, autoscaling will be triggered. The value can be 60%, 65%, 70%, 75%, 80%, 85%, and 90%. Increase By: percentage that your instance storage will be scaled up at. The value can be 10%, 15%, or 20%.
   Static Data Encryption	You can determine whether to encrypt static data. Disable: Data is not encrypted. Enable: If you select this option, your data will be encrypted on disks and stored in ciphertext after you create an instance. When you download encrypted objects, the ciphertext will be decrypted into plain text 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. NOTE: This function is now in OBT. To use it, choose Service Tickets > Create Service Ticket in the upper right corner of the console and contact the customer service. An agency will be created after static data encryption is enabled. After an instance is created, the static data 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.

   Figure 3 Network and database configurations
   

   Table 4 Network

   Parameter	Description
   VPC	Virtual private network where your instances are located. A VPC isolates networks for different services. You can select an existing VPC or create a VPC. For details about how to create a VPC, see "Creating a VPC" in Virtual Private Cloud User Guide. With VPC sharing, you can also use a VPC and subnet shared by another account. VPC owners can share the subnets in a VPC with one or multiple accounts through Resource Access Manager (RAM), which ensures cost efficiency of network resources. For more information about VPC subnet sharing, see VPC Sharing in Virtual Private Cloud User Guide. If there are no VPCs available, the system allocates resources to you by default. NOTE: After an instance is created, the VPC where the instance is deployed cannot be changed. If you want to connect to an instance using an ECS over a private network, ensure that the instance and the ECS are in the same VPC. If they are not, create a VPC peering connection between them.
   Subnet	A subnet where your instance is created. The subnet provides dedicated and isolated networks, improving network security. NOTE: An IPv6 subnet cannot be associated with your instance. Select an IPv4 subnet.
   Security Group	A security group controls access between instances and other services. Ensure that the security group you selected allows your client to access the instance. If no security group is available, the system creates one for you.
   Database Port	Database port number. 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.
   Access Control	Skip Skip: Access is restricted based on the VPC access policy by default. Configure: Specify how access is controlled. Three options are available: All IP addresses: All IP addresses can access the instance. Whitelist: Only IP addresses in a group can access the instance. Blacklist: IP addresses in a group cannot access the instance.

   Table 5 Database configuration

   Parameter	Description
   Password	Skip: You can set the database password after creating an instance. Configure: You can set the database password when creating an instance.
   Password	Password of database administrator rwuser: Must be 8 to 32 characters long. Can contain at least two types of the following characters: 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.
   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 CIDR blocks can be configured.
   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 Advanced settings

   Parameter	Description
   Static Data Encryption	Data is encrypted when stored. Disable Enable Static data encryption improves security but slightly affects database I/O performance. An agency will be created after disk encryption is enabled.
   Key	Set when Enable is selected for Static Data Encryption. Select: Select a key name from the drop-down list. Enter: Enter a key ID. The ID cannot be empty, and your KMS key must be in the current region.
   Key Name	You can select an existing key or create a key. The key cannot be disabled, deleted, or frozen when used, or the database becomes unavailable.
   SSL	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. NOTE: If SSL is not enabled when you create an instance, you can enable it after the instance is created. For details, see Encrypting Data over SSL for a GeminiDB Redis Instance.
   Rename High-risk Command	To prevent data loss, instance restart, and performance jitter caused by misoperations, you can rename high-risk commands of a GeminiDB Redis instance. For details, see Renaming Commands of a GeminiDB Redis Instance.
   Parameter Template	You can use parameters in a parameter template to manage database API configurations. A database parameter template acts as a container for API configuration values that can be applied to one or more instances. Each user can create up to 100 parameter templates. All types of instances in the same project can share the quota. For details, see Creating a Parameter Template.
   Maintenance Window	Time range of change tasks that affect instances, such as specifications change and patch installation Skip Configure
   Tags	The setting is optional. Adding tags helps you better identify and manage your instances. A maximum of 20 tags can be added for each instance. 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. A tag key is mandatory if the instance will be tagged. Each tag key is unique for each instance. It can contain 1 to 128 characters, cannot start with _sys_, and cannot start or end with a space. Only letters, digits, spaces, and the following special characters are allowed: -_@.:/+= A tag value is optional if the instance will be tagged. The value can be empty. The value can contain a maximum of 255 characters. Only letters, digits, spaces, and the following special characters are allowed: _.-:+=@/ After an instance is created, you can view its tag details on the Tags tab. In addition, you can add, modify, and delete tags of an existing instance. For details, see Tag Management.

   Table 7 Required duration

   Parameter	Description
   Required duration	The length of your subscription if you select Yearly/Monthly billing. Subscription lengths range from one month to three years.
   Auto-renewing an Instance	By default, this option is not selected. If you select this option, the instance is automatically renewed based on the subscription duration.

5. On the displayed page, confirm instance details.
   • Yearly/Monthly
     • To modify the configurations, click Previous.
     • If no modification is required, read and agree to the service agreement, click Pay Now, and complete the payment.
   • Pay-per-use
     • To modify the configurations, click Previous.
     • If no modification is required, read and agree to the service agreement and click Submit.

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

   The instance creation process takes about 5 to 15 minutes. 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.