Simple Application Server:ResetSystem

You can reset a simple application server to re-install its application system or OS and re-initialize the server. You can reset a simple application server by resetting the current system or replacing the image.

You can use one of the following methods to reset a simple application server:

• Reset the current system. You can re-install the operating system without replacing the image.
• Replace the image. You can select an Alibaba Cloud image or a custom image that is different from the existing image of the server to reinstall the OS of the server.

Precautions

• After you reset a simple application server, the disk data on the server is cleared. Back up the data as needed.

• After you reset a simple application server, the monitoring operations that are performed on the server may fail. In this case, you can use one of the following methods to install the CloudMonitor agent on the server:

  • Connect to the server: For more information, see Manually install the CloudMonitor agent for C++ on an ECS instance.
  • Use Command Assistant: For more information, see Use Command Assistant. You can obtain the command that can be used to install CloudMonitor from the "Common commands" section of the Use Command Assistant topic.

Limits

• Snapshots that are created before a server is reset are retained, but the snapshots cannot be used to roll back the disks of the server.

• You cannot reset simple application servers that were created based on custom images that contain data of data disks.

• Before you reset a simple application server by replacing the existing image with a custom image, take note of the following items:

  • The custom image must reside in the same region as the current server.

  • The custom image cannot be created based on the current server. If you want to recover the data on the server, you can use a snapshot of the server to roll back the disks of the server.

  • If your simple application server resides outside the Chinese mainland, you cannot switch the OS of the server between Windows Server and Linux. You cannot use a Windows Server custom image to reset a Linux simple application server. You also cannot use a Linux custom image to reset a Windows Server simple application server. You can switch the OSs of simple application servers only between Windows Server OSs or between Linux distributions.

  • The following limits apply to the disks attached to the simple application server:

    • If the custom image contains a system disk and a data disk but only a system disk is attached to the simple application server and no data disk is attached, you cannot use the custom image to reset the simple application server.
    • If the system disk size of the custom image is greater than the system disk size of the simple application server, you cannot directly use the custom image to reset the simple application server.
    • Only if the system disk size of the simple application server is greater than or equal to the system disk size of the custom image, you can use the custom image to reset the simple application server. To increase the system disk size of your simple application server, you can upgrade the server. For more information, see Upgrade a simple application server.
    • If the data disk size of the custom image is greater than the data disk size of the simple application server, you cannot use the custom image to reset the simple application server.

QPS limit

You can call this API operation up to 10 times per minute per account. Requests that exceed this limit are dropped and you may experience service interruptions. We recommend that you take note of this limit when you call this operation. For more information, see QPS limits.