Permissions Management

If your account does not need individual IAM users for permissions management, you may skip over this chapter.

If you need to assign different permissions to employees in your enterprise to access your DDM resources, IAM is a good choice for fine-grained permissions management. IAM provides identity authentication, permissions management, and access control, helping you secure access to your Huawei Cloud resources.

You can create IAM users for your employees, and assign permissions to these users to control their access to specific types of resources. For example, you can create IAM users for software developers and assign specific permissions to allow them to use DDM resources but disallow them to delete the resources or perform any high-risk operations.

IAM is free of charge. You pay only for the resources in your account.

DDM Permissions

By default, new IAM users do not have any permissions assigned. To assign permissions to these new users, you need to add them to one or more groups, and attach permissions policies or roles to these groups.

DDM is a project-level service deployed in specific physical regions. When assigning DDM permissions to a user group, you need to specify region-specific projects where the permissions will take effect. If you select All projects, the permissions will be granted for all region-specific projects. To access DDM, you need to switch to the region where you are authorized.

You can grant users permissions using roles and policies.

Roles: A type of coarse-grained authorization mechanism that provides only a limited number of service-level roles. When using roles to grant permissions, you also need to assign other dependent roles. Roles are not ideal for fine-grained authorization and secure access control.

Policies: A fine-grained authorization mechanism that defines permissions required to perform operations on specific cloud resources under certain conditions. This mechanism allows for more flexible policy-based authorization and more secure access control. For example, you can grant IAM users only the permissions for managing a certain type of DDM resources.

**Table 1** System-defined policies
Policy Name	Description	Type	Dependency
DDM FullAccess	Full permissions for Distributed Database Middleware	System-defined policy	None
DDM CommonOperations	Common permissions for Distributed Database Middleware, excluding the permissions to create, delete, and add nodes, configure shards, and roll back shard configuration tasks	System-defined policy	None
DDM ReadOnlyAccess	Read-only permissions for Distributed Database Middleware	System-defined policy	None

The following are permission configurations of supported system-defined policies:

DDM FullAccess

{
      "Version": "1.1",
       "Statement": [{
	    "Action": ["ddm:*:*",
	    "rds:instance:list",
            "rds:instance:modify",
            "rds:instance:modifyParameter",
	    "vpc:*:*",
            "ecs:*:get*",
            "ecs:*:list*",
            "ecs:cloudServerNics:update",
            "ecs:serverInterfaces:use"],
	     "Effect": "Allow"
		}]
	}

DDM CommonOperations

{
	"Version": "1.1",
	"Statement": [{
				"Action": [
					"vpc:*:*list*",
					"vpc:*:*get*",
					"vpc:ports:update",
					"ecs:*:get*",
					"ecs:*:list*",
					"rds:instance:list",
					"rds:instance:modify",
					"rds:instance:modifyParameter"
				],
				"Effect": "Allow"
				},
				{
					"Condition": {
						"StringEqualsIgnoreCase": {
							"g:ServiceName": [
								"ddm"
							]
						}
					},
					"NotAction": [
						"ddm:instance:create",
						"ddm:instance:delete",
						"ddm:database:migrate*",
						"ddm:instance:resize",
						"ddm:instance:extendNode"
					],
					"Effect": "Allow"
		}]
	}

DDM ReadOnlyAccess

{
     "Version": "1.1",
     "Statement": [{
                    "Action": [
                        "rds:instance:list",
                        "vpc:*:*list*",
                        "vpc:*:*get*",
                        "ecs:*:get*",
                        "ecs:*:list*",
                        "ddm:*:list",
                        "ddm:*:get",
                        "ddm:instance:listParameter",
                        "ddm:instance:listRwInfo",
                        "ddm:instance:listSlowSqlInfo",
                        "ddm:rds:connectivity"
                    ],
                    "Effect": "Allow"
		}]
	}

Table 2 lists the common operations supported by each DDM system-defined policy. Choose appropriate system-defined policies based on your requirements.

**Table 2** Common operations supported by each system-defined policy
Operation	DDM FullAccess	DDM CommonOperations	DDM ReadOnlyAccess
Querying DDM instances	Supported	Supported	Supported
Querying details of a DDM instance	Supported	Supported	Supported
Modifying instance information, including the name and security group	Supported	Supported	Not supported
Restarting a DDM instance	Supported	Supported	Not supported
Creating a DDM instance	Supported	Not supported	Not supported
Deleting a DDM Instance	Supported	Not supported	Not supported
Changing node class	Supported	Not supported	Not supported
Scaling out a DDM instance	Supported	Not supported	Not supported
Creating a schema	Supported	Supported	Not supported
Querying schemas	Supported	Supported	Supported
Querying details of a schema	Supported	Supported	Supported
Performing a rollback if configuring shards fails Deleting source data if configuring shards fails Retrying if configuring shards fails	Supported	Not supported	Not supported
Deleting a schema	Supported	Supported	Not supported
Querying accounts	Supported	Supported	Supported
Creating an account	Supported	Supported	Not supported
Modifying an account	Supported	Supported	Not supported
Resetting a password	Supported	Supported	Not supported
Deleting an account	Supported	Supported	Not supported
Synchronizing data node information	Supported	Supported	Not supported
Querying data nodes	Supported	Supported	Supported
Querying details of a data node	Supported	Supported	Supported
Modifying the read policy of a data node	Supported	Supported	Not supported
Viewing products	Supported	Supported	Supported
Creating a parameter template	Supported	Supported	Not supported
Deleting a parameter template	Supported	Supported	Not supported
Applying a parameter template	Supported	Supported	Not supported
Modifying a parameter template	Supported	Supported	Not supported
Replicating a parameter template	Supported	Supported	Not supported
Comparing two parameter templates	Supported	Supported	Supported
Querying parameter templates	Supported	Supported	Supported

**Table 3** Common operations and supported actions
Operation Category	Operation	Action
DDM routine operations	As required	ddm:instance:create Before you a DDM instance, obtain the following dependent permissions: ecs::get ecs::list vpc:vpcs:list vpc:securityGroups:get vpc:subnets:get ecs:cloudServerNics:update ecs:serverInterfaces:use vpc:ports:* when you want to buy a global or regional DDM instance
	Querying DDM instances	ddm:instance:list
	Querying details of a DDM instance	ddm:instance:get To view details of a DDM instance, you need to configure the following permissions: vpc::get vpc::list
	Modifying instance information, including the name and security group	ddm:instance:modify To modify a security group, you need to configure the following permissions: vpc::get vpc::list vpc:ports:update
	Restarting a DDM instance	ddm:instance:reboot
	Deleting a DDM instance	ddm:instance:delete vpc:ports:delete
	Changing node class	ddm:instance:resize
	Scaling out a DDM instance	ddm:instance:extendNode
	Monitoring the read/write ratio	ddm:instance:listRwInfo
	Monitoring slow SQL queries	ddm:instance:listSlowSqlInfo
DDM routine operations	Renewing a yearly/monthly DDM instance	Configure policies BSS Finance and BSS Operator as follows: Log in to the IAM console. In the navigation pane, click User Groups. Choose More > Assign Permissions. Click Attach Policy in the same row as the project for which you want to edit the permissions. In the Available Policies area, select BSS Finance and BSS Operator.
DDM routine operations	Changing to yearly/monthly billing	Configure policies BSS Finance and BSS Operator. The procedure is the same as that for renewing an instance.
DDM schema operations	Creating a schema	ddm:database:create
	Querying schemas	ddm:database:list
	Querying details of a schema	ddm:database:get
	Performing a rollback if configuring shards fails Deleting source data if configuring shards fails Retrying if configuring shards fails	ddm:database:migrateRollback
	Deleting a schema	ddm:database:delete
DDM account operations	Querying accounts	ddm:user:list
	Creating an account	ddm:user:create
	Modifying an account	ddm:user:modify
	Resetting a password	ddm:user:modify
	Deleting an account	ddm:user:delete
DDM and data node management (using an RDS for MySQL instance as an example)	Synchronizing data node information	ddm:rds:synchro To synchronize data node information, you need to configure the following permissions: rds:instance:list rds:instance:modify rds:instance:modifyParameter
	Querying data nodes	ddm:rds:list
	Querying details of a data node	ddm:rds:get
	Modifying the read policy of a data node	ddm:rds:modifyReadPolicy
DDM product operations	Viewing products	ddm:product:list
DDM parameter template operations	Creating a parameter template	ddm:param:create
	Deleting a parameter template	ddm:param:delete
	Applying a parameter template	ddm:param:apply
	Modifying a parameter template	ddm:param:update
	Replicating a parameter template	ddm:param:create
	Comparing two parameter templates	ddm:param:list
	Querying parameter templates	ddm:param:list