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Running shutdown scripts | Compute Engine Documentation

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Create and run shutdown scripts that execute commands right before a virtual machine (VM) instance is stopped or restarted. This is useful if you rely on automated scripts to start up and shut down instances, allowing instances time to clean up or perform tasks, such as exporting logs, or syncing with other systems.

Shutdown scripts are especially useful for VMs in a managed instance group with an autoscaler. If the autoscaler shuts down a VM in the group, the shutdown script runs before the VM stops and the shutdown script performs any actions that you define. The script runs during the limited shutdown period before the VM stops. For example, your shutdown script might copy processed data to Cloud Storage or back up any logs.

Shutdown scripts function very similarly to startup scripts. Much of the documentation for startup scripts also applies for shutdown scripts.

For both shutdown and reboot tasks, VMs always run shutdown scripts as follows:

• For Linux VMs, by using the root user.
• For Windows VMs, by using the System account.

• Learn about Startup scripts.
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To perform this task, you must have the following permissions:

• All permissions required to create an instance
• compute.instances.setMetadata on the instance

The following sections outline the specifications for shutdown scripts.

There are some limitations to note when using shutdown scripts:

• Compute Engine executes shutdown scripts only on a best-effort basis. In rare cases, Compute Engine cannot guarantee that the shutdown script will complete.
• On Windows, the Local Group Policy is used to launch the shutdown script.
  • The installation package configures the Local Group Policy Computer Configuration/Windows Setting/Scripts (Startup/Shutdown) setting to launch the script upon system shutdown.

Shutdown scripts are triggered when the instance shuts down after any of the following events happen:

• You do the following:

  • Stop or reboot the instance from within the guest OS.

  • Stop or delete the instance.

• Compute Engine stops an instance as part of a programmed stop or delete operation.

• Compute Engine stops a Spot VM or preemptible instance as part of the preemption process.

A shutdown script can be of any file type. If there is a shutdown script present in the instance, then Compute Engine does the following:

1. Copies the script to a local file in the instance.
2. Sets permissions on the file to make the script executable.
3. Executes the file when the instance shuts down.

You could, for example, provide a Python script instead of a bash script. Keep in mind that Compute Engine runs the script verbatim, regardless of the type of script.

To execute a script that is not bash, add a shebang line at the top of the file to let the operating system know which interpreter to use. For example, for a Python script, you can add a shebang line like:

#!/usr/bin/python

Your shutdown scripts start running when Compute Engine sets the instance state to STOPPING. Your scripts must complete before the instance is fully stopped, which is when its state changes to TERMINATED. The time the instance takes to reach the TERMINATED state varies depending on the instance type.

If your scripts take longer than the time it takes for the instance to stop, then Compute Engine forcefully stops the scripts, which can lead to data loss or incomplete tasks. To prevent this, stop the instance from within its guest OS. This approach keeps the instance state to STOPPING until your shutdown scripts finish running.

A local shutdown script is a script that lives on your local computer. Pass in a local shutdown script either as a file or by giving the contents directly to Compute Engine.

Shutdown scripts can perform as many actions as you need, but if you are passing in the file locally, your script cannot exceed the metadata value length limit of 256 KB. To use a script that exceeds the length limit, store your file on Cloud Storage. See Use shutdown script from Cloud Storage for more information.

You can only pass in a local shutdown script file through the gcloud command-line tool.

To pass in a local shutdown script file, supply the --metadata-from-file flag, followed by a metadata key pair, shutdown-script=PATH/TO/FILE, where PATH/TO/FILE is a relative path to the shutdown script. For example:

gcloud compute instances create example-instance \
    --metadata-from-file shutdown-script=examples/scripts/install.sh

To specify a shutdown script directly, use the google_compute_instance resource with the path to the shutdown script in the metadata.

Alternatively, you can pass in the contents of your shutdown script directly.

In Google Cloud console, specify a shutdown script directly using the shutdown-script metadata key:

1. Go to the Create an instance page.

   Go to Create an instance

2. Specify the VM details.

3. Expand the Advanced options section.

4. Expand Management, and do the following:

   1. In the Metadata section, click Add item.
   2. In the Key field, enter shutdown-script for the metadata key.
   3. In the Value field, add the contents of your shutdown script.

5. Continue with the VM creation process.

Using the Google Cloud CLI, use the --metadata flag to provide the contents of your shutdown script, followed by the shutdown-script=CONTENTS key pair, where CONTENTS is the content of your shutdown script.

gcloud compute instances create example-instance --metadata shutdown-script="#! /bin/bash
> # Shuts down Apache server
> /etc/init.d/apache2 stop"

To specify a shutdown script directly, use the google_compute_instance resource with the shutdown script in the metadata.

In the API, provide a shutdown script as part of the metadata property in your request when you create an instance. Use shutdown-script as the metadata key:

POST https://compute.googleapis.com/compute/v1/projects/myproject/zones/us-central1-a/instances

{...
  "metadata": {
    "items": [
      {
       "key": "shutdown-script",
       "value": "#! /bin/bash\n\n# Shuts down Apache server\n/etc/init.d/apache2 stop"
      }
    ]
  }...
}

Run shutdown scripts on Windows instances using the following Windows-specific metadata keys. Choose from any of the specialized keys listed below. Each key should match the type of script you want to run.

You can specify multiple shutdown scripts by passing in different keys to your instance but each key can only be specified once per virtual machine.

The following keys can be used with a local shutdown script, using the same instructions above.

You can store and use a shutdown script from Cloud Storage. Follow the instructions in the Startup scripts documentation but replace startup-script-url with shutdown-script-url.

For Windows instances, replace windows-startup-script-url with windows-shutdown-script-url.

To add a shutdown script to a running instance, follow the instructions in the Applying a startup script to running instances documentation but replace the metadata keys with one of the following keys:

• shutdown-script: Supply the shutdown script contents directly with this key. Using the Google Cloud CLI, you can provide the path to a shutdown script file, using the --metadata-from-file flag and the shutdown-script metadata key.
• shutdown-script-url: Supply a Cloud Storage URL to the shutdown script file with this key.

You can view the output from a Linux shutdown script by doing any of the following:

• Connecting to the instance and running the following command:

  sudo journalctl -u google-shutdown-scripts.service

• Viewing the output through serial port 1 in the Google Cloud console and checking for google_metadata_script_runner events.

• IAP Desktop from a Windows workstation. For more information, see the GoogleCloudPlatform/iap-desktop repo on GitHub.

View the output from a Windows Server shutdown script by using any of the following and checking for GCEMetadataScripts events:

• Serial port 1 in the Google Cloud console. For more information, see Viewing serial port output.

• Windows Event Viewer's Application Log.

• IAP Desktop from a Windows workstation. For more information, see the GoogleCloudPlatform/iap-desktop repo on GitHub.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-07 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[[["Shutdown scripts execute commands right before a virtual machine (VM) instance is stopped or restarted, allowing for tasks like exporting logs or syncing with other systems."],["These scripts are particularly useful for VMs in managed instance groups with autoscalers, ensuring actions are performed before a VM is shut down by the autoscaler."],["Shutdown scripts can be local files or their contents directly provided, and for larger scripts, they can be stored in Cloud Storage and referenced via a URL."],["Compute Engine executes shutdown scripts on a best-effort basis, with a limited time window before the instance is fully stopped, during which the script should complete its tasks."],["Shutdown scripts run as the `root` user for Linux VMs and the `System` account for Windows VMs, and can be triggered by stopping, rebooting, or deleting an instance, or by Compute Engine itself."]]],[]]

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