Use Cuttlefish to Launch an AOSP Build

This page describes how to launch an AOSP build using Cuttlefish.

Verify KVM availability

Cuttlefish is a virtual device and is dependent on virtualization being available on the host machine.

In a terminal on your host machine, make sure that virtualization with a Kernel-based Virtual Machine (KVM) is available:

grep -c -w "vmx\|svm" /proc/cpuinfo

This command should return a nonzero value.

When running on an ARM machine, the most direct way is to check for /dev/kvm:

find /dev -name kvm

Launch Cuttlefish

  1. In a terminal window, download, build, and install the host Debian packages:

    sudo apt install -y git devscripts config-package-dev debhelper-compat golang curl
    git clone
    cd android-cuttlefish
    for dir in base frontend; do
      cd $dir
      debuild -i -us -uc -b -d
      cd ..
    sudo dpkg -i ./cuttlefish-base_*_*64.deb || sudo apt-get install -f
    sudo dpkg -i ./cuttlefish-user_*_*64.deb || sudo apt-get install -f
    sudo usermod -aG kvm,cvdnetwork,render $USER
    sudo reboot

    The reboot triggers installing additional kernel modules and applies udev rules.

  2. Cuttlefish is part of the Android Open-Source Platform (AOSP). Builds of the virtual device are found at the Android Continuous Integration site. To find an index of all Android builds, navigate to the Android Continuous Integration site at

  3. Enter a branch name. Use the default aosp-main branch or use a generic system image (GSI) branch such as aosp-android13-gsi.

  4. Navigate to the aosp_cf_x86_64_phone build target and click userdebug for the latest build.

  5. Click the green box below userdebug to select this build. A Details panel appears with more information specific to this build. In this panel, click Artifacts to see a list of all the artifacts attached to this build.

  6. In the Artifacts panel, download the artifacts for Cuttlefish.

    1. Click the artifact, which contains the device images. In the filename, "xxxxxx" is the build ID for this device.

    2. Scroll down in the panel and download cvd-host_package.tar.gz. Always download the host package from the same build as your images.

  7. On your local system, create a container folder and extract the packages:

    mkdir cf
    cd cf
    tar -xvf /path/to/cvd-host_package.tar.gz
    unzip /path/to/
  8. Launch Cuttlefish:

    HOME=$PWD ./bin/launch_cvd --daemon

Verify that Cuttlefish is visible through adb

Similar to a physical device, Cuttlefish is visible through the Android Debug Bridge (adb).

In the same folder where you launched Cuttlefish, run the following command to see a list of all the Android devices available through adb on your host machine:

./bin/adb devices

View and interact with the virtual device in the web

By default, Cuttlefish launches with --start_webrtc, which enables a webview through port 8443 on the host machine.

To view and interact with your virtual devices, navigate to https://localhost:8443 in your web browser.

For more information, see Cuttlefish: WebRTC Streaming.

Stop Cuttlefish

Stop the virtual device within the same directory as you used to launch the device:

HOME=$PWD ./bin/stop_cvd