本文为您介绍实时计算的角色授权操作，包括自动化角色授予流程、重新初始化流程和常见问题。

您开通实时计算服务时，需要先为实时计算的服务账号，授予系统默认角色AliyunStreamDefaultRole。

说明 仅当AliyunStreamDefaultRole被正确授予后，实时计算才能正常地调用相关服务（例如RDS）。

当前角色授权信息查看

  1. 登录RAM角色管理
  2. 在RAM角色管理页面底部的RAM角色名称列中单击AliyunStreamDefaultRole。
  3. 在AliyunStreamDefaultRole页面中单击权限管理 > AliyunStreamRolePolicy。
  4. 在策略内容页签内查看实时计算当前策略信息，如下所示。 
    {
  "Version": "1",
  "Statement": [
    {
      "Action": [
        "ots:List*",
        "ots:DescribeTable",
        "ots:Get*",
        "ots:*Row"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "dhs:Create*",
        "dhs:List*",
        "dhs:Get*",
        "dhs:PutRecords",
        "dhs:DeleteTopic"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "log:List*",
        "log:Get*",
        "log:Post*"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "mns:List*",
        "mns:Get*",
        "mns:Send*",
        "mns:Publish*",
        "mns:Subscribe"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "drds:DescribeDrdsInstance",
        "drds:ModifyDrdsIpWhiteList"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "rds:Describe*",
        "rds:ModifySecurityIps*"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "vpc:DescribeVpcs",
        "vpc:DescribeVSwitches"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": [
        "ecs:CreateSecurityGroup",
        "ecs:AuthorizeSecurityGroup",
        "ecs:CreateNetworkInterface",
        "ecs:DescribeNetworkInterfaces",
        "ecs:AttachNetworkInterface",
        "ecs:DescribeNetworkInterfacePermissions",
        "ecs:CreateNetworkInterfacePermission"
      ],
      "Resource": "*",
      "Effect": "Allow"
    },
    {
      "Action": "oss:*",
      "Resource": "*",
      "Effect": "Allow"
    }
  ]
}