Creating a DDM Instance¶
Prerequisites¶
You have logged in to the DDM console.
Procedure¶
On the displayed page, in the upper right corner, click Create DDM Instance.
On the displayed page, configure the required parameters.
Table 1 Parameter description¶ Parameter
Description
Region
Region where the DDM instance is located. Select the required region.
AZ
Availability zone where the DDM instance is deployed.
Nodes in a DDM instance can be deployed on different physical servers in the same AZ to keep services always available even if one physical server becomes faulty.
A DDM instance can be deployed across AZs to provide cross-AZ DR.
If necessary, you can select multiple AZs when you create a DDM instance. Then nodes of the instance will be deployed in multiple different AZs.
Note
Deploy your application, DDM instance, and required RDS instances in the same AZ to reduce network latency. Cross-AZ deployment may increase network latency.
Instance Name
Name of the DDM instance, which:
Cannot be left blank.
Must start with a letter.
Must be 4 to 64 characters long.
Can contain only letters, digits, and hyphens (-).
Node Class
Class of the DDM instance node. You can select General-enhanced or Kunpeng general computing-plus and then specify a node class.
Note
Estimate compute and storage requirements of your applications based on your service type and scale before you create a DDM instance, and then select an appropriate node class so that the CPU and memory specifications of your DDM instance can better meet your needs.
Instance Nodes
Number of nodes in a DDM instance. Up to 32 nodes are supported.
Note
At least 2 nodes are recommended because using a single node cannot guarantee high availability.
VPC
VPC that the DDM instance belongs to. This VPC isolates networks for different services. It allows you to manage and configure private networks, simplifying network management.
Click View VPC to show more details and security group rules.
Note
The DDM instance should be in the same VPC as the required RDS for MySQL instance.
To ensure network connectivity, the DDM instance you purchased must be in the same VPC as your applications and RDS for MySQL instances.
Subnet
Name and IP address range of the subnet
Security Group
Select an existing security group.
You are advised to select the same security group for your DDM instance, application, and RDS for MySQL instances so that they can communicate with each other. If different security groups are selected, add security group rules to enable network access.
Parameter Template
Select an existing parameter template. You can also click View Parameter Template to set parameters on the displayed page.
Tags
(Optional) Adding tags helps you better identify and manage your DDM resources.
You can add tags to your instance. Each instance can have a maximum of 20 tags.
Tag key: This parameter is mandatory and cannot be null.
Must be unique for each instance.
Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@).
Can include 1 to 36 characters.
Cannot be an empty string or start with _sys_.
Tag value: This parameter is mandatory.
Is an empty string by default.
Can only consist of digits, letters, underscores (_), hyphens (-), and at sign (@).
Can contain 0 to 43 characters.
After the configuration is complete, click Create Now at the bottom of the page.
Confirm the configurations and click Submit.