Introduction

Create IAM users and assign permissions to the users so you can perform fine-grained permissions management for your MRS resources. If your Huawei Cloud account meets service requirements, you do not need to create IAM users. In this case, skip this section.

By default, new IAM users do not have permissions assigned. You need to add them to one or more groups, and attach permissions policies or roles to these groups. Users inherit permissions from the groups to which they are added and can perform specified operations on cloud services based on the permissions.

You can grant users permissions by using roles and policies. Roles are a type of coarse-grained authorization mechanism that defines permissions related to user responsibilities. Policies define API-based permissions for operations on specific resources under certain conditions, allowing for more fine-grained, secure access control of cloud resources.

Policy-based authorization is useful if you want to allow or deny the access to an API.

An account has all the permissions required to call all APIs, but IAM users must be assigned the required permissions. The permissions required for calling an API are determined by the actions supported by the API. Only users who have been granted permissions allowing the actions can call the API successfully. For example, if an IAM user queries MRS clusters using an API, the user must have been granted permissions that allow the mrs:cluster:list action.

Supported Actions

MRS provides system-defined policies that can be directly used in IAM. MRS cluster administrators can also create custom policies and use them to supplement system-defined policies, implementing more refined access control. Operations supported by policies are specific to APIs. The following are common concepts related to policies:

Permission: A statement in a policy that allows or denies certain operations.
API: REST APIs that can be called by a user who has been granted specific permissions.
Action: Specific operations that are allowed or denied.
Related actions: Actions on which a specific action depends to take effect. When assigning permissions for the action to a user, you also need to assign permissions for the related actions.
IAM or enterprise projects: Type of projects for which an action will take effect. Policies that contain actions for both IAM and enterprise projects can be used and take effect for both IAM and Enterprise Management. Policies that only contain actions for IAM projects can be used and only take effect for IAM.

The check mark (√) indicates that an action takes effect. The cross mark (x) indicates that an action does not take effect.

**Table 1** Actions
Permissions	API	Action	IAM Project	Enterprise Project
Creating a Cluster and Executing a Job	POST /v1.1/{project_id}/run-job-flow	mrs:cluster:create	√	√
Resizing a Cluster	PUT /v1.1/{project_id}/cluster_infos/{cluster_id}	mrs:cluster:resize	√	√
Querying a Cluster List	GET /v1.1/{project_id}/cluster_infos	mrs:cluster:list	√	√
Querying Cluster Details	GET /v1.1/{project_id}/cluster_infos/{cluster_id}	mrs:cluster:get	√	√
Deleting a Cluster	DELETE /v1.1/{project_id}/clusters/{cluster_id}	mrs:cluster:delete	√	√
Querying a Host List	GET /v1.1/{project_id}/clusters/{cluster_id}/hosts	mrs:host:list	√	√
Adding and Executing a Job (V1)	POST /v1.1/{project_id}/jobs/submit-job	mrs:job:submit	√	√
Querying the exe Object List of Jobs (V1)	GET /v1.1/{project_id}/job-exes	mrs:job:list	√	√
Querying exe Object Details (V1)	GET /v1.1/{project_id}/job-exes/{job_exe_id}	mrs:job:get	√	√
Configuring an Auto Scaling Rule	POST /v1.1/{project_id}/autoscaling-policy/{cluster_id}	mrs:cluster:policy	√	√
Querying Tags of a Specified Cluster	GET /v1.1/{project_id}/clusters/{cluster_id}/tags	mrs:tag:list	√	√
Adding or Deleting Cluster Tags in Batches	POST /v1.1/{project_id}/clusters/{cluster_id}/tags/action	mrs:tag:batchOperate	√	√
Querying All Tags	GET /v1.1/{project_id}/clusters/tags	mrs:tag:list	√	√
Querying a List of Clusters with Specified Tags	POST /v1.1/{project_id}/clusters/resource_instances/action	mrs:tag:listResource	√	×
Adding and Executing a Job (V2)	POST /v2/{project_id}/clusters/{cluster_id}/job-executions	mrs:job:submit	√	√
Querying Information About a Job (V2)	GET /v2/{project_id}/clusters/{cluster_id}/job-executions/{job_execution_id}	mrs:job:list	√	√
Querying a List of Jobs (V2)	GET /v2/{project_id}/clusters/{cluster_id}/job-executions	mrs:job:list	√	√
Terminating a Job (V2)	POST /v2/{project_id}/clusters/{cluster_id}/job-executions/{job_execution_id}/kill	mrs:job:stop	√	√
Deleting Jobs in Batches (V2)	POST /v2/{project_id}/clusters/{cluster_id}/job-executions/batch-delete	mrs:job:batchDelete	√	√
Obtaining the SQL Result (V2)	GET /v2/{project_id}/clusters/{cluster_id}/job-executions/{job_execution_id}/sql-result	mrs:job:list	√	√