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How Cloud Shell works | Google Cloud

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Cloud Shell provisions a Compute Engine virtual machine running a Debian-based Linux operating system for your temporary use. This virtual machine is owned and managed by Google Cloud, so will not appear within any of your Google Cloud projects.

Cloud Shell instances are provisioned on a per-user, per-session basis. The instance persists while your Cloud Shell session is active; after an hour of inactivity, your session terminates and its VM is discarded. For more on usage quotas, refer to the limitations guide.

With the default Cloud Shell experience, you are allocated with an ephemeral, pre-configured VM and the environment you work with is a Docker container running on that VM. You can also customize your environment automatically on VM boot to ensure that your Cloud Shell instance includes your preferred tools.

Cloud Shell provisions 5 GB of free persistent disk storage mounted as your $HOME directory on the virtual machine instance. This storage is on a per-user basis and is available across projects. Unlike the instance itself, this storage does not time out on inactivity. All files you store in your home directory, including installed software, scripts and user configuration files like .bashrc and .vimrc, persist between sessions. Your $HOME directory is private to you and can't be accessed by other users.

When using Cloud Shell, you cannot expand persistent disk storage space. For more control of your storage persistence, and for more storage space, you can use Cloud Workstations.

Cloud Shell also offers Ephemeral mode which is the Cloud Shell experience without persistent disk storage. With Ephemeral mode, you'll have faster startup times but all the files you create in your session are lost on session end.

When you make a Google Cloud API call or use a command-line tool that requires credentials (such as the Google Cloud CLI) with Cloud Shell for the first time, Cloud Shell prompts you to authorize. Click Authorize to allow the tool to use your credentials to make calls.

Refer to the Authorizing with Cloud Shell for more details.

When Cloud Shell is started, the active project in the Google Cloud console is propagated to your gcloud configuration inside Cloud Shell for immediate use. GOOGLE_CLOUD_PROJECT, the environmental variable used by Application Default Credentials library support to define the project ID, is also set to point to the active project in the Google Cloud console. The environment variable WEB_HOST points to the hostname of your Cloud Shell VM which you can use to make HTTPS requests to the environment.

Cloud Shell is globally distributed across multiple Google Cloud regions. When you first connect to Cloud Shell, you are automatically assigned to the closest available region. You can't pick your own region and if Cloud Shell doesn't pick the closest region, Cloud Shell tries to migrate your Cloud Shell VM to a closer region when your Cloud Shell VM isn't in use.

To view your current region, run the following command from a Cloud Shell session:

curl metadata/computeMetadata/v1/instance/zone

The Cloud Shell container image is updated weekly to keep prepackaged tools up to date. This means Cloud Shell always comes with the latest versions of the gcloud CLI, Docker, and other utilities.

When you set up a Cloud Shell session, you get a regular Unix user account with a username based on your email address. With this access, you have full root privileges on your allocated VM and can even run sudo commands, if you need to.

The Cloud Shell virtual machine instance has the following pre-installed tools:

You can install additional software packages on the virtual machine instance but the installation will not persist after the instance terminates unless you install the software in your $HOME directory or create a custom environment.

The Cloud Shell virtual machine instance provides pre-installed language support for the following:

The default version of the Java environment is 17. To change the current Cloud Shell session to use version 1.11 of the JRE and JDK, enter the following at the Cloud Shell command prompt:

sudo update-java-alternatives -s java-1.11.0-openjdk-amd64 && export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64

To change to 21:

sudo update-java-alternatives -s java-1.21.0-openjdk-amd64 && export JAVA_HOME=/usr/lib/jvm/java-21-openjdk-amd64

To change back to 17:

sudo update-java-alternatives -s java-1.17.0-openjdk-amd64 && export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/jre

If there's a problem in your .bashrc or .tmux.conf files, Cloud Shell immediately closes after connection. Safe mode restarts your Cloud Shell instance and logs you in as root, allowing you to fix any issues in the files.

To open Cloud Shell in safe mode:

• Append cloudshellsafemode=true to the URL.
• In Cloud Shell, click more_vert, click Safe Mode, and then click Restart.

To permanently delete all files in your home directory and restore your Cloud Shell home directory to a clean state, you can reset your Cloud Shell VM.

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 2025-07-02 UTC.

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