AliyunServiceRoleForGaAlb

When you specify an Application Load Balancer (ALB) instance as an origin server, your GA instance must assume the service-linked role AliyunServiceRoleForGaAlb. If your GA instance does not assume the service-linked role, the system automatically creates the role for your GA instance.

AliyunServiceRoleForGaAlb is a service-linked role of GA. To specify an ALB instance as an origin server, your GA instance must assume the service-linked role AliyunServiceRoleForGaAlb.

Note A service-linked role is a Resource Access Management (RAM) role that is associated with an Alibaba Cloud service. In some cases, to use a feature of a cloud service, you must first acquire the permissions to access other cloud services. Service-linked roles simplify the authorization process and avoid user errors. For more information, see Service-linked roles.

Permissions required to create AliyunServiceRoleForGaAlb

By default, an Alibaba Cloud account is authorized to create the service-linked role AliyunServiceRoleForGaAlb. If a RAM user wants to create the service-linked role, you must first use the Alibaba Cloud account to grant the following permissions to the RAM user:

{
      "Action": "ram:CreateServiceLinkedRole",
      "Resource": "*",
      "Effect": "Allow",
      "Condition": {
        "StringEquals": {
          "ram:ServiceName": "alb.ga.aliyuncs.com"
        }
      }
}

You can grant the RAM user the required permissions by using one of the following methods:

Attach the administrator permission policy AliyunGlobalAccelerationFullAccess to the RAM user. For more information, see Grant permissions to a RAM role.

Note The permissions required to create the service-linked role AliyunServiceRoleForGaAlb are included in the administrator permission policy AliyunGlobalAccelerationFullAccess. Therefore, after you attach the administrator permission policy to a RAM user, the RAM user can create the service-linked role AliyunServiceRoleForGaAlb.
Attach a custom permission policy to a RAM user. The following code block shows the content of the custom permission policy:
```
{
      "Action": "ram:CreateServiceLinkedRole",
      "Resource": "*",
      "Effect": "Allow",
      "Condition": {
        "StringEquals": {
          "ram:ServiceName": "alb.ga.aliyuncs.com"
        }
      }
}
```
For more information, see Create a custom policy and Grant permissions to a RAM role.

Create the service-linked role AliyunServiceRoleForGaAlb

When you specify an ALB instance as an origin server, the system checks whether your GA instance assumes the service-linked role AliyunServiceRoleForGaAlb.

If your GA instance does not assume the service-linked role AliyunServiceRoleForGaAlb, the system automatically creates the service-linked role and attaches the permission policy AliyunServiceRoleForGaAlb to the service-linked role. This allows GA to access ALB. The following code block shows the content of the permission policy:
```
{
  "Statement": [
    {
      "Effect": "Allow",
      "Action": "alb:GetLoadBalancerAttribute",
      "Resource": "*"
    },
    {
      "Action": "ram:DeleteServiceLinkedRole",
      "Resource": "*",
      "Effect": "Allow",
      "Condition": {
        "StringEquals": {
          "ram:ServiceName": "alb.ga.aliyuncs.com"
        }
      }
    }
  ],
  "Version": "1"
}
```
If your GA instance assumes the service-linked role AliyunServiceRoleForGaAlb, the system does not create the service-linked role again.

Delete the service-linked role AliyunServiceRoleForGaAlb

The system does not automatically delete the service-linked role AliyunServiceRoleForGaAlb. To delete the service-linked role, you must first disassociate the ALB instance from your GA instance. Then, you can delete the service-linked role. For more information, see: