Simple Application Server is available across the Chinese mainland and beyond. Select your region before creating a server — you cannot change it afterward.
Regions
A region is a geographic location where Alibaba Cloud data centers are deployed, typically named after the city. For example, the Malaysia (Kuala Lumpur) region has its data centers in Kuala Lumpur.For example, the data centers of the Malaysia (Kuala Lumpur) region reside in Kuala Lumpur.
Choose a region
Consider the following factors when selecting a region:
| Factor | Guidance |
|---|---|
| Proximity to users | Deploy in the region closest to your target users to minimize latency. For example, if most of your traffic comes from Southeast Asia, choose Singapore or Malaysia (Kuala Lumpur). |
| Internal network communication | To connect your cloud services over the internal network, deploy them in the same region. Services in different regions cannot communicate over the internal network unless you purchase a cloud networking service. |
| Resource pricing | Prices vary by region. Check the product page or resource purchase page for current pricing. |
The region cannot be changed after a server is created or purchased. Select carefully before proceeding.
Supported regions
| Area | Scenario | Regions |
|---|---|---|
| Chinese mainland | Your users and business are primarily in the Chinese mainland. Important If you are in the Chinese mainland and use servers in the China (Hong Kong) region or regions outside the Chinese mainland, you may experience high network latency. Select the region closest to your target customers to reduce latency. | China (Ulanqab), China (Heyuan), China (Beijing), China (Shanghai), China (Hangzhou), China (Shenzhen), China (Guangzhou), China (Chengdu), China (Qingdao), China (Hohhot) |
| Outside the Chinese mainland | Your users and business are outside the Chinese mainland. Important The network is not directly connected to the Chinese mainland. If you are in the Chinese mainland and access servers in China (Hong Kong) or other outside-mainland regions, expect high network latency and packet loss. | China (Hong Kong), Singapore, Malaysia (Kuala Lumpur), Indonesia (Jakarta), Philippines (Manila), Thailand (Bangkok), Japan (Tokyo), South Korea (Seoul), UK (London), Germany (Frankfurt), US (Virginia), US (Silicon Valley) |
Network connectivity
Simple Application Server instances connect to other services using either the internal network or the Internet.
Internal network
Servers communicate over Alibaba Cloud's internal Local Area Network (LAN). Internal network traffic within the same region is free.
Connected by default:
Multiple Simple Application Server instances in the same Alibaba Cloud account and region are placed in the same Virtual Private Cloud (VPC) and can communicate with each other over the internal network.
Simple Application Server and Object Storage Service (OSS) instances in the same account and region can communicate over the internal network. For details, see Access OSS resources over the internal network.
Requires additional configuration:
By default, Simple Application Server instances cannot communicate over the internal network with other Alibaba Cloud services deployed in VPCs, such as Elastic Computing Service (ECS) instances and ApsaraDB instances. To enable this, configure service interconnection.
Internet
Alibaba Cloud assigns a public IP address to each instance, enabling it to send and receive traffic over the Internet.
Bandwidth limitations:
Bandwidth is the maximum inbound or outbound data transfer rate and is not guaranteed.
During peak hours, resource contention may reduce bandwidth and cause packet loss.
Simple Application Server is not designed for workloads with strict Internet connection quality requirements.
For applications that require stable, high-quality Internet connectivity, use ECS instances with pay-by-bandwidth billing instead.
Alibaba Cloud recommends that you select a data center that is closest to your business and target users to ensure high-speed and stable website access. Bandwidth in China (Hong Kong) and other regions outside the Chinese mainland is provisioned for users outside the Chinese mainland. Users in the Chinese mainland accessing these regions may experience high latency.