Base
Hardened build
minimal ports, security patches applied at build time
WBO Collaborative Whiteboard on Ubuntu 24.04 LTS
Azure
Applications
WBO, an open source self hosted online collaborative whiteboard: open a board by URL and draw together in real time with pen, shapes, text and images.
Overview
WBO (Whitebophir) is an open source, self hosted online collaborative whiteboard. You and your collaborators open the same board by its URL and draw on a shared, infinite canvas in real time over websockets, with a pen, straight lines, rectangles, ellipses, text and images. It is a lean, privacy respecting alternative to hosted whiteboard services: your boards stay on your own server and never touch a third party.
Each board is stored as files on the server's own disk, so there is no external database to run. It suits teams who want a private whiteboard for brainstorming, diagramming, teaching and remote collaboration on infrastructure they control.
Why the cloudimg image
cloudimg delivers WBO fully installed as a Node.js service behind an nginx reverse proxy, so the whiteboard answers within minutes of launch. Because WBO has no login of its own, the image is hardened never to be left open: WBO binds to loopback only, and on first boot every instance generates its own HTTP Basic Auth password and its own self signed TLS certificate, both covering the whole whiteboard and stored in a root only file, so no two machines share a secret and nothing but a health check is reachable without the password. The websocket upgrade real time drawing depends on is proxied correctly, the base is fully patched with unattended security updates enabled, and every image includes a step by step deploy guide tested against the exact build and 24/7 cloudimg support.
Common uses
- A private, self hosted whiteboard for brainstorming and diagramming
- Real time collaboration and teaching on a shared infinite canvas
- Sketching and planning together without sending boards to a third party
See it running
Real screenshots taken while testing this image against its deployment guide.
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