Running Fusion in Docker

This guide shows how to build and run Fusion in a container.

This document is about containerizing Fusion itself (docker build / docker run). For managed Docker mesh-node provisioning architecture (services, routes, mesh config flow, and 4041 vs reserved 4040 port convention), see Architecture → Docker Node Provisioning.

Build the image

docker build -t fusion .

Run the dashboard

Mount your project into /project and publish the dashboard port:

docker run -p 4040:4040 -v /path/to/project:/project fusion

By default, the container runs:

fn dashboard

on port 4040.

Environment variables

Pass provider credentials and integrations with -e flags:

-e ANTHROPIC_API_KEY=...
-e OPENAI_API_KEY=...
-e GITHUB_TOKEN=...
-e FUSION_DASHBOARD_TOKEN=fn_your_stable_token   # optional; persists across restarts

Add any other provider keys your setup requires (for example OPENROUTER_API_KEY).

Dashboard authentication

The dashboard is bearer-token protected by default. In a container the auto-generated token appears in docker logs on startup — copy it, or set FUSION_DASHBOARD_TOKEN (or the back-compat FUSION_DAEMON_TOKEN) to a stable value so the token survives restarts. See CLI reference → fn dashboard → Authentication for the full flow.

Pass additional CLI flags

You can append normal CLI arguments after the image name:

docker run fusion dashboard --port 8080

If you change the dashboard port, also update Docker port mapping:

docker run -p 8080:8080 fusion dashboard --port 8080

Persistence

Fusion state lives in .fusion under the mounted project. You can mount it explicitly:

docker run -p 4040:4040 \
  -v /path/to/project:/project \
  -v /path/to/project/.fusion:/project/.fusion \
  fusion

Complete example

docker run --rm \
  -p 4040:4040 \
  -v /path/to/project:/project \
  -v /path/to/project/.fusion:/project/.fusion \
  -e ANTHROPIC_API_KEY=your_key \
  -e OPENAI_API_KEY=your_key \
  -e GITHUB_TOKEN=your_token \
  fusion dashboard --port 4040

Notes

• The container runs as the non-root node user.
• git must be available in the container runtime. The mounted project volume must preserve .git metadata and repository history for worktree operations; Fusion initializes missing repositories during project registration.
• The root Dockerfile installs with pnpm install --frozen-lockfile before copying full source, so every workspace package/plugin manifest in pnpm-workspace.yaml must have a corresponding COPY <path>/package.json line in the builder stage.