Encryption in transit for SMB file systems - Apsara File Storage NAS

Server Message Block (SMB) file systems use authenticated encryption to protect against interception or tampering when data is transmitted between ECS instances and NAS file systems.

Usage notes

Operating systems supported by compute nodes

On the compute nodes, you must use operating systems that support SMB 3.0 or later. The following table lists the operating systems.

Type	Version
Windows Server	Windows Server 2012 R2 Datacenter 64-bit (Chinese version) and later Windows Server 2012 R2 Datacenter 64-bit (English version) and later
Alibaba Cloud Linux	Alibaba Cloud Linux 2 (kernel version: 4.19.34 and later) Alibaba Cloud Linux 3
Red Hat	Red Hat Enterprise Linux 7.5 64-bit and later
CentOS	CentOS 7.6 64-bit and later
Ubuntu	Ubuntu 18.04 64-bit and later
Debian	Debian 10.2 64-bit and later
SUSE Linux	SUSE Linux Enterprise Server 12 SP2 64-bit and later
OpenSUSE	openSUSE Leap 42.3 64-bit and later
CoreOS	CoreOS 4.19.43 and later

Permissions for encryption in transit
Anonymous users are not allowed to use the encryption in transit feature. Only Active Directory (AD) users can use this feature after they mount SMB file systems.
Performance loss
Compared with a file system for which you disable encryption in transit, a file system for which you enable encryption in transit can be accessed with a 10% more latency and 10% less IOPS.

Enable encryption in transit

You can enable encryption in transit for an SMB file system only if you use the access control list (ACL) for the SMB file system. The following table describes the parameters that you can specify to enable the feature.

Parameter

Description

Enable Encryption in Transit

Select Yes to enable encryption in transit for the SMB file system.

Deny Access from Non-encrypted Clients

Configure the types of compute nodes that can access the SMB file system.

Yes: You can mount the SMB file system by using a compute node for which encryption in transit is enabled. This means that you can use an AD account to mount the SMB file system on a compute node whose operating system supports encryption in transit.
However, you cannot mount the SMB file system as an anonymous user or by using a compute node that does not support encryption in transit.
No: You can mount the SMB file system from all types of compute nodes. However, the encryption in transit feature can be enabled only if you use an AD account to mount the SMB file system on a compute node whose operating system supports encryption in transit.

For more information, see Features.