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    Serverless App Engine:Change instance specifications

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    Serverless App Engine:Change instance specifications

    Last Updated:Aug 13, 2026

    After you deploy an application to Serverless App Engine (SAE), you can change the application's instance specifications, such as vCPU and memory, as needed.

    Prerequisites

    • To ensure business continuity, configure Minimum Available Instances before you change instance specifications. For instructions, see Upgrade and Roll Back Applications.

    • The application is running.

    Background

    If an application's instance specifications are too low, it may stop working properly. For example, insufficient memory can cause an out-of-memory (OOM) error. In this case, you must increase the instance specifications—without altering the application configuration—to ensure the application runs correctly.

    Important

    After you change the instance specifications, SAE automatically redeploys the application.

    • For applications with a single instance, this change causes a few seconds of downtime. To minimize business impact, perform this operation during off-peak hours.

    • This change does not affect applications with multiple instances.

    Procedure

    1. On the SAE Application List page, select a region and namespace at the top, and click the ID of the target application to open the application details page.

    2. On the Basic Information page, click the Application Information tab, and then click Change Specifications.

    3. In the Change Instance Specifications dialog box, Select the Target Instance Specifications, set the Minimum Available Instances, and then click OK.

      Changing the specifications automatically triggers an application deployment task. Set the Minimum Available Instances in advance. This setting supports two modes: By count and By ratio. You can also select the Use system recommended value checkbox.

    4. Verify the result.

      • Method 1: On the Basic Information page, go to the Application Information tab, and check the Instance Specifications field. It displays the current configuration, for example, 1 Core, 2 GiB, Temporary Disk Size: 20 GiB. If the displayed value matches the target specifications, the change is successful. You can also go to the Applications list page and check the Instance Specifications column directly, for example, 1 Core 2 GB.

      • Method 2: On the application's Change Records page, check the latest change record. A successful status indicates that the change is complete. Note that the description field of a change record only includes the version and image information, and does not show a before-and-after comparison of the instance specifications. To view the history of specification changes, use ActionTrail instead.