Mount a file system on a Linux ECS instance - Apsara File Storage NAS

Before you can access data in Apsara File Storage NAS (NAS), you must create a NAS file system and mount the file system on an Elastic Compute Service (ECS) instance. This topic describes how to create a General-purpose Network File System (NFS) file system in the NAS console. This topic also describes how to mount the NFS file system on an ECS instance that runs CentOS 7.9. After you mount the file system on the ECS instance, you can upload data to or download data from the file system.

Prerequisites

NAS is activated.
The first time you visit the product page of NAS, follow the instructions to activate the service.
An ECS instance is created in the China (Hangzhou) region. The operating system of the instance is CentOS 7.9. For more information, see Create an ECS instance.

Step 1: Create an NFS file system

Log on to the NAS console.
In the lower part of the Overview page, click Create General-purpose NAS File System.

On the General-purpose NAS (Pay-as-you-go) page, configure the parameters. The following table describes the parameters. For the parameters that are not described in the following table, select values based on your business requirements or use the default values.

For more information, see Create a file system.

Parameter	Description
Region	Select China (Hangzhou).
Zone	Select Hangzhou Zone F. The file system and the ECS instance must reside in the same zone.
Protocol Type	Select NFS.
Network Type	Select VPC.
VPC	Select the virtual private cloud (VPC) where the ECS instance resides.
VSwitch	Select a vSwitch that resides in the VPC.

Click Buy Now and follow the instructions to complete the payment.
Note
A permission group named "VPC default permission group (all allowed)" is generated for each Alibaba Cloud account. All IP addresses in the VPC are allowed to access the file system by using the mount target of the file system. You can also create a permission group based on your business scenario. For more information, see Create a permission group and add rules to the permission group.
For a General-purpose NAS file system, a mount target is automatically generated and the "VPC default permission group (all allowed)" is attached to the mount target. For an Extreme NAS file system, you must manually create a mount target. For more information, see Create a mount target.

Step 2: Mount the file system in the NAS console

In the left-side navigation pane, choose File System > File System List.
In the top navigation bar, select a region.
Find the file system that you created and click Mount in the Actions column.
Note
The first time you use the mount feature in the NAS console, you must assign the AliyunServiceRoleForNasEcsHandler service-linked role to NAS. Follow the instructions in the dialog box to complete authorization. For more information, see Service-linked roles of NAS.

In the Mount panel, perform the configurations to mount the file system.

Select a mount target and click Next.
Select an ECS instance and click Next.
The selected ECS instance must reside in the same VPC as the file system. Otherwise, NAS prompts that the network may be disconnected. Proceed with caution.
Note
- If you cannot find the ECS instance from the drop-down list, refresh the page and try again.
- You can select only one ECS instance. If you want to mount a NAS file system on multiple ECS instances, see Mount a NAS file system on multiple ECS instances at a time.

Mount the file system on the ECS instance.

Parameter	Description
Mount Path	Enter the local path on which you want to mount the file system. The local path resides on the Linux ECS instance.
Automatic Mount	By default, Automatic Mount at Startup is selected. When you restart the ECS instance, you do not need to re-mount the file system.
Protocol Type	Select the protocol type of the file system. General-purpose NAS file systems support NFSv3 and NFSv4. If you do not need to modify the same NAS file on multiple ECS instances at a time, we recommend that you select NFSv3 to ensure optimal performance. Extreme NAS file systems support only NFSv3.
NAS Directory	Enter the directory of the NAS file system. You can enter the root directory / or a subdirectory, for example, /abc. Note If the directory does not exist, you can select Confirm New Directory to create a directory in the file system. In addition, you must configure the user identifier (UID), group identifier (GID), and POSIX permissions for creating the directory. Otherwise, the default values and default permissions are used to create the directory.
Mount Parameters	We recommend that you use the default mount parameters. For more information, see the mount parameters described in Mount an NFS file system on a Linux ECS instance.

Click Mount.
The mount takes about 1 to 2 minutes. If the mount status is Mounted, the NAS file system is mounted on the ECS instance. If the mount status is Failed, you can use the troubleshooting tool to troubleshoot the issue. For more information, see Mount an NFS file system on a Linux ECS instance.

Step 3: Verify the mount result

After you mount the file system on the ECS instance, you can use the file system in the same way as you use a local directory. The following figure shows an example.

Remotely connect to the ECS instance by referring to Connection methods, and run the following commands to access the file system:
```
mkdir /mnt/dir1
mkdir /mnt/dir2
touch /mnt/file1
echo 'some file content' > /mnt/file2
ls /mnt
```
If an output similar to the following example appears, you have accessed the General-purpose Capacity NFS file system.