Simple Application Server:Simple Application Server limitations

Item

Description

Instance quantity

By default, a single Alibaba Cloud account can have a maximum of 50 instances in a region. This quota is shared across Simple Application Server (SAS). To request a quota increase, see View or increase instance quotas.

Virtualization software and secondary virtualization

You cannot install virtualization software or perform secondary virtualization.

Sound card applications

SAS does not support sound card applications.

Attaching external hardware devices

You cannot attach external hardware devices, such as hardware dongles, USB flash drives, external hard drives, or USB security keys.

ICP filing service numbers

For each server located in the Chinese mainland region with a subscription of three months or longer (including cumulative renewals), you can apply for a maximum of five ICP filing service numbers.

Item

Description

Custom image quota

A single Alibaba Cloud account can have a custom image quota of three times its number of server instances, with a maximum of 15 images.

Cross-account image sharing

• Images can only be shared with accounts in the same region.

• You can share each custom image with up to 10 primary Alibaba Cloud accounts. Sharing with Resource Access Management (RAM) users is not supported.

• Sharing images between China site accounts and international site accounts is not supported.

• When you share a custom image that includes a data disk, the data disk itself is not shared.

For more information, see Share custom images across accounts.

Application or system images

Some images contain pre-installed software in the

/home/staragent/

and

/usr/local

directories, such as

/usr/local/aegis

and

/usr/local/cloudmonitor

. These files are environment dependencies and must not be modified.

Releasing a custom image

Releasing a SAS instance also releases any custom images created from it.

Item

Description

Number of snapshots per server

You can create a maximum of three snapshots for each server.

Snapshot quota per account

A single Alibaba Cloud account can have a snapshot quota of three times its number of server instances, with a maximum of 15 snapshots.

Scheduled snapshots

Only manual snapshot creation is supported.

Rolling back a disk from a snapshot

Although snapshots are retained after a system reset or image change, you cannot use them to roll back the disk.

Releasing a snapshot

If a SAS instance expires and is released, its corresponding snapshots are also released.

Downloading or exporting a snapshot

You cannot download or export snapshots.

Item

Description

Public IP address

Each SAS instance comes with a default public IP address. You cannot change this IP address, and it is not retained after the instance expires.

IPv6 address

SAS does not support IPv6 addresses.

Bandwidth

• The relationship between inbound and outbound bandwidth depends on the peak outbound bandwidth of your plan:

  • If the peak outbound bandwidth of your purchased plan is 10 Mbps or less, Alibaba Cloud allocates 10 Mbps of inbound bandwidth.

  • If the peak outbound bandwidth of your purchased plan is greater than 10 Mbps, Alibaba Cloud allocates inbound bandwidth equal to the peak outbound bandwidth.

• The Internet bandwidth in your plan represents a peak value for both outbound and inbound traffic and is not a performance guarantee. During peak business hours, network resource contention may lead to bandwidth limitations or packet loss. This service is unsuitable for applications that require guaranteed public network quality. If your business requires a high-quality public network connection, purchase an Elastic Compute Service (ECS) instance with a fixed-bandwidth plan.

Firewall

• You can create a maximum of 50 firewall rules for a single server.

• You cannot use port 25 on a SAS instance to send outbound emails. To send emails, use port 465.

For more information, see Manage firewalls.

Internal network communication

By default, all SAS instances under the same Alibaba Cloud account and within the same region can communicate with each other over the internal network. By default, they cannot communicate over the internal network with other Alibaba Cloud products in a Virtual Private Cloud (VPC), such as ECS instances or ApsaraDB instances. To enable this communication, you can manage the VPC connection. For more information, see Manage VPC connections.