Desktop (VNC) Example

Launch Xvfb + x11vnc + fluxbox in OpenSandbox to provide a VNC-accessible desktop environment.

Build the Desktop Sandbox Image

The Dockerfile in the example directory builds a sandbox image with desktop and VNC components pre-installed:

cd examples/desktop
docker build -t opensandbox/desktop:latest .

This image includes:

• Xvfb (virtual framebuffer X server)
• x11vnc (VNC server)
• XFCE desktop (panel, file manager, terminal)
• Non-root user (desktop) for security

Start OpenSandbox server [local]

Pre-pull the desktop image:

docker pull opensandbox/desktop:latest

Start the local OpenSandbox server:

uv pip install opensandbox-server
opensandbox-server init-config ~/.sandbox.toml --example docker
opensandbox-server

Create and Access the Desktop Sandbox

# Install OpenSandbox package
uv pip install opensandbox

uv run python examples/desktop/main.py

The script starts the desktop stack (Xvfb + XFCE + x11vnc) and also launches noVNC/websockify. It prints:

• VNC endpoint (endpoint.endpoint) for native VNC clients, password from VNC_PASSWORD (default: opensandbox)
• noVNC URL for browsers (/vnc.html?host=...&port=...&path=...)

The sandbox stays alive for 5 minutes by default; interrupt sooner with Ctrl+C. Uses the prebuilt desktop image by default.

Environment Variables

Variable	Default	Description
SANDBOX_DOMAIN	localhost:8080	Sandbox service address
SANDBOX_API_KEY	(optional for local)	API key if your server requires authentication
SANDBOX_IMAGE	opensandbox/desktop:latest	Sandbox image to use
VNC_PASSWORD	opensandbox	Password for VNC access

References

• noVNC
• x11vnc
• Source code on GitHub