By default, Resource Access Management (RAM) users do not have permissions to prefetch or refresh resources. You can attach system or custom permission policies to a RAM user to allow the RAM user to prefetch and refresh resources.

Prerequisites

A RAM user is created. If no RAM user is created, create one. For more information, see Create a RAM user.

Background information

By default, RAM users do not have permissions to prefetch or refresh resources. If you log on to the Alibaba Cloud CDN console and attempt to prefetch or refresh resources as a RAM user, the following error message appears: The account does not have access to the page interface, or the interface does not support RAM access control. In this case, you must grant the required prefetch and refresh permissions to the RAM user. Error
RAM supports two types of permission policy: system permission policy and custom permission policy. You can attach a system or custom permission policy to the RAM to allow the RAM user to prefetch and refresh resources.
  • System permission policy

    System permission policies are automatically created by Alibaba Cloud and cannot be modified. A system permission policy grants RAM users full permissions on Alibaba Cloud CDN. It takes only a few steps to authorize RAM users by using system permission policies. For more information about how to attach a system permission policy to a RAM user, see Method 1: Attach a system permission policy to a RAM user.

  • Custom permission policy

    You can create, update, and manage custom permission policies based on business requirements. Custom permission policies grant RAM users only specified permissions. For example, you can use a custom permission policy to allow a RAM user only to prefetch and refresh resources, or manage the log storage feature. In this case, the RAM user does not have permissions to perform operations other than the authorized ones. For more information about how to attach a custom permission policy to a RAM user, see Method 2: Attach a custom permission policy to a RAM user.

Method 1: Attach a system permission policy to a RAM user

  1. Log on to the RAM console.
  2. In the left-side navigation pane, choose Identities > Users.
  3. On the Users page, find the RAM user to which you want to grant permissions and click Add Permissions in the Actions column.
    Add permissions
  4. In the Add Permissions penal, set the following parameters.
    Add a system permission policy
    1. Set Authorized Scope to Alibaba Cloud Account.
    2. Click the System Policy tab.
    3. Enter AliyunCDN in the search box. The system automatically displays all permission policies that are related to Alibaba Cloud CDN.
    4. Click AliyunCDNFullAccess to add the policy to the Selected list.
      Note The AliyunCDNFullAcces permission policy grants the RAM user full permissions on Alibaba Cloud CDN. The RAM user has permissions to call CDN API operations and manage all accelerated domain names.
  5. Click OK.
  6. Click Complete.

Method 2: Attach a custom permission policy to a RAM user

  1. Create a custom permission policy.
    1. Log on to the RAM console.
    2. In the left-side navigation pane, choose Permissions > Policies.
    3. On the Policies page, click Create Policy.
    4. Choose JSON.
      创建权限策略
      Enter the following content. This permission policy grants the RAM user permissions on the prefetch and refresh API operations. The RAM user can call API operations to prefetch or refresh resources. 
      {
  "Version": "1",
  "Statement": [
    {
      "Action": [
        "cdn:PushObjectCache",
        "cdn:RefreshObjectCaches",
        "cdn:DescribeRefreshTasks",
        "cdn:DescribeRefreshQuota"
      ],
      "Resource": "acs:cdn:*:*:*",
      "Effect": "Allow"
    }
  ]
}
      Note
      • All API operations of Alibaba Cloud CDN can be defined in custom permission policies. You can add other API operations to custom permission policies based on your business requirements. After you attach these policies to RAM users, the RAM users have permissions to call the specified API operations. For more information about the actions that you can authorize RAM users to perform, see RAM authorization.
      • The policy content must be expressed in a specific syntax structure to describe the authorized resource sets, operation sets, and authorization conditions. For more information, see Policy structure and syntax and Policy elements.
    5. Click Next Step, set the basic information.
      Parameter Description
      Name Enter a name that is descriptive and easy to identify. AliyunCdnRefresh is used in this example.
      Note Optional. Enter remarks for the permission policy.
    6. Click OK.
  2. Grant permissions to the RAM user.
    1. Log on to the RAM console.
    2. In the left-side navigation pane, choose Identities > Users
    3. On the Users page, find the RAM user to which you want to grant permissions and click Add Permissions in the Actions column.
      Add permissions
    4. In the Add Permissions penal, set the following parameters.
      Add permissions
      Parameter Description
      Authorized Scope Select Alibaba Cloud Account, which specifies that the authorized scope is all resources that belong to the current Alibaba Cloud account. Do not select Specific Resource Group.
      Principal The current RAM user is selected by default.
      Select Policy Click the Custom Policy tab. Enter the name of the custom permission policy created in Step1. The name of the custom permission policy in this example is AliyunCdnRefresh. After the system displays the policy, click its name to add it to the Selected list.
    5. Click OK.
    6. Click Complete.

What to do next

Log on to the Alibaba Cloud Management Console as a RAM user