This topic describes how to use Cloud Enterprise Network (CEN) to enable a cross-account mount for a file system.
Prerequisites
Before you enable a cross-account mount for a file system, the following requirements must be met:
- A file system is created. For more information, seeCreate a file system.
- A mount target is created. For more information, see Create a mount target.
Background information
By default, you can mount a file system only on an Elastic Compute Service (ECS) instance that is owned by the same account as that of the file system. Assume that you have multiple Alibaba Cloud accounts and want to allow mutual access between a file system and an ECS instance from these different accounts. You must establish a connection between the VPCs that host the file system and the ECS instance.
You can use CEN to connect the VPCs that are owned by different accounts.
This topic describes how to attach VPC 1 of Account A and VPC 2 of Account B to the same CEN instance.

Step 1 Create a CEN instance
Use Account A to create a CEN instance.
Step 2: Authorize an account to access the network of a different account
Use Account B to authorize Account A to attach VPC 2. For more information, see VPC authorization.
Step 3: Use an account to attach a network that is owned by a different account
Use Account A to attach VPC 2.
Mount a file system
After the configuration is complete, you can perform a cross-account mount on a file system.