This topic describes the limits on Simple Application Server.
Limits on servers
Each Alibaba Cloud account can create a maximum of 20 simple application servers.
Simple application servers do not support virtualization software or secondary virtualization.
Simple application servers do not support sound card applications.
External hardware such as USB devices, USB security keys, external hard disks, and dongles cannot be connected to simple application servers.
Each simple application server can have only one data disk mounted.
If a simple application server is located in the Chinese mainland and its total subscription period (including renewal periods) reaches three months or longer, you can apply for up to five ICP filings for the server.
By default, a public IP address is assigned to each simple application server. The public IP address is not retained when you change to a different server or when the original server expires.
IPv6 addresses cannot be configured for simple application servers.
If a simple application server is released when it expires, the snapshots and custom images that are created based on the server are also released.
Limits on other resources
If the peak outbound bandwidth in the plan that you purchased for your simple application server is less than or equal to 10 Mbit/s, the inbound bandwidth of the server is 10 Mbit/s.
If the peak outbound bandwidth in the plan that you purchased for your simple application server exceeds 10 Mbit/s, the inbound bandwidth of the server is equal to the peak outbound bandwidth.
Application or OS images
Pre-installed software in the
/usr/localdirectories of specific images, such as the
/usr/local/cloudmonitordirectories, is the programs or repository files on which the environment depends. Proceed with caution if you want to modify the software.
You can create a maximum of 50 firewall rules for each simple application server.
Port 25 on simple application servers cannot be used to send emails to external resources. To send emails, use port 465.
You can create up to three snapshots for disks of each simple application server.
The maximum number of snapshots that can be retained in an Alibaba Cloud account is triple the number of simple application servers in the account. The value cannot be greater than 15.
You can only manually create snapshots. The system cannot create snapshots on schedule.
If a simple application server is reset, the snapshots that are created before the server is reset are retained, but the snapshots cannot be used to roll back the disks of the server.
The maximum number of custom images that can be retained in an Alibaba Cloud account is triple the number of simple application servers in the account. The value cannot be greater than 15.