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 devices such as USB devices, USB security keys, external hard disks, and dongles cannot be connected to simple application servers.
  • A maximum of one data disk can be mounted to a simple application server. This operation can be performed only when you are creating the server.
  • If a simple application server is located in mainland China and its total subscription period is three months or longer, you can apply for up to five ICP filings for each 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 of the server are also released.

Limits on other resources

  • Network 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 /home/staragent/ and /usr/local directories of specific images, such as the /usr/local/aegis and /usr/local/cloudmonitor directories, is the programs or repository files on which the environment depends. Proceed with caution if you want to modify the software.

  • Firewalls
    • 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.
  • Snapshots
    • For a single Alibaba Cloud account, the maximum number of snapshots that can be retained is three times the number of created simple application servers, up to 15.
    • Only manual snapshots are supported. Scheduled snapshots are not supported.
  • Custom images

    The maximum number of custom images is three times the number of created simple application servers, up to 15.