Simple Application Server:ResetSystem

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

• Reset the current system: You can re-install the operating system without changing the image.
• Change the image: You can select another Alibaba Cloud image or a custom image to re-install the operating system.

Precautions

• Resetting the system or changing the image of a simple application server clears the disk data on the server. Back up the data as needed.

• After you reset a simple application server, monitoring 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 the reset are retained, but the snapshots cannot be used to restore the disks of the server.

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

• If you reset a simple application server by replacing the existing image with a custom image, the following limits apply:

  • 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 restore the data on the server, you can use a snapshot of the server to restore disk data.

  • If your simple application server resides in a region outside the Chinese mainland, you cannot switch the operating system of the server between Windows Server and Linux. You cannot use a Windows Server custom image to reset a Linux simple application server. Similarly, you cannot use a Linux custom image to reset a Windows Server simple application server. You can switch the operating systems of simple application servers only between Windows Server versions 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, 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 server, you can upgrade the server configuration. 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.