3.4 KiB
sap-mcp-bridge — build sources
This directory contains the Docker build context for the
git.alexzaw.dev/alexz/sap-mcp-bridge image that the Runtipi app
references. The same files are mirrored under
~/projects/sap-mcp-bridge/ so you can iterate on the image outside
the Runtipi tree if you prefer; treat the two locations as
copies-in-sync.
Files
| File | Role |
|---|---|
Dockerfile |
Node 24 + nginx + gosu + tini, installs 5 MCP servers + supergateway globally. |
entrypoint.sh |
Boots as root → chowns /workspace → drops to mcp via gosu → launches 5 gateways on 127.0.0.1:9001–9005 → execs nginx on :8080. |
nginx.conf |
Path-prefixed reverse proxy (/cap/mcp, /abap/mcp, …) with SSE/streaming-safe defaults (no buffering, 24h timeouts). |
build.sh |
docker build && docker push to git.alexzaw.dev/alexz/sap-mcp-bridge:<tag>. |
How it works
The MCP servers are stdio-only. supergateway wraps each one as a
small HTTP server speaking the MCP "Streamable HTTP" transport. Each
gateway binds its own port (9001–9005) on the loopback interface,
inside the container only. An internal nginx is the only thing
that listens on the EXPOSEd port (8080) and routes requests by URL
path:
8080/cap/mcp -> 127.0.0.1:9001/mcp
8080/abap/mcp -> 127.0.0.1:9002/mcp
8080/odata/mcp -> 127.0.0.1:9003/mcp
8080/ui5/mcp -> 127.0.0.1:9004/mcp
8080/fiori/mcp -> 127.0.0.1:9005/mcp
8080/healthz -> 127.0.0.1:9001/healthz (aggregate probe)
This single-port design is what makes the container Runtipi-deployable behind Traefik, which only routes one port per app.
Build & push
cd /etc/runtipi/repos/runtipi/apps/sap-mcp-bridge/build
./build.sh # builds + pushes :latest
IMAGE_TAG=1.0.0 ./build.sh # tag a specific version
./build.sh --no-cache # forwarded to docker build
You must be logged in to the Gitea Docker registry:
docker login git.alexzaw.dev
Deploy to Runtipi
After build.sh succeeds:
cd /etc/runtipi/repos/runtipi
sudo git add apps/sap-mcp-bridge
sudo git commit -m "sap-mcp-bridge: <what changed>"
sudo git push origin main
cd /etc/runtipi
sudo ./runtipi-cli appstore update
sudo ./runtipi-cli app update sap-mcp-bridge:runtipi # for an already-installed app
# (first time: install via the Runtipi dashboard so form fields are written)
Local sanity check (no Runtipi)
docker run --rm -p 8080:8080 \
-v "$PWD/workspace:/workspace" \
git.alexzaw.dev/alexz/sap-mcp-bridge:latest
# In another terminal:
curl http://127.0.0.1:8080/ # landing page lists endpoints
curl http://127.0.0.1:8080/healthz # 200
curl http://127.0.0.1:8080/cap/healthz # 200 once cap-js-mcp-server boots
Image dependencies (pinned in the Dockerfile)
- Base:
node:24-bookworm-slim supergateway@latest@iflow-mcp/cap-js-mcp-server@latest@iflow-mcp/mcp-abap-adt@1.1.0@iflow-mcp/btp-sap-odata-to-mcp-server@1.0.0@ui5/mcp-server@0.2.11@sap-ux/fiori-mcp-server@0.6.49- OS packages:
tini ca-certificates curl nginx gosu
Bump the pinned versions in Dockerfile then rebuild.