# Dockerfile Compliance with Docker MCP Registry Requirements
## ✅ Compliance Check
### Current Configuration
**Dockerfile Structure:**
- ✅ Multi-stage build (builder + production)
- ✅ Non-root user (app)
- ✅ Minimal base image (node:lts-slim)
- ✅ Proper layer caching
- ✅ System dependencies (openssl) installed
- ✅ CMD for stdio MCP server
**Command Configuration:**
```dockerfile
CMD ["node", "build/index.js"]
```
### ✅ Compliance with Docker MCP Registry Standards
1. **✅ Dockerfile in root directory** - Required
2. **✅ Valid Dockerfile** - Builds successfully
3. **✅ CMD for stdio transport** - Standard for MCP servers
4. **✅ Non-root user** - Security best practice
5. **✅ Minimal image size** - Uses node:lts-slim
6. **✅ System dependencies** - openssl installed for random generation
### Comparison with Registry Examples
**From Docker MCP Registry examples:**
- Most stdio MCP servers use: `CMD ["node", "path/to/server.js"]` or `CMD ["python", "main.py"]`
- ENTRYPOINT is rarely used for simple stdio servers
- Logging is handled in application code (console.error)
**Our implementation:**
- ✅ Uses `CMD ["node", "build/index.js"]` - matches standard pattern
- ✅ Logging via console.error in application code - visible in docker logs
- ✅ No ENTRYPOINT needed - simpler and more flexible
### Why CMD Instead of ENTRYPOINT?
1. **Flexibility**: Users can override command if needed
2. **Standard Practice**: Matches examples in Docker MCP Registry
3. **Simplicity**: No need for wrapper script for simple stdio servers
4. **Docker Best Practices**: CMD is preferred for default command
### Logging
Logs are visible in `docker logs` because:
- All logs use `console.error()` which writes to stderr
- stderr is captured by Docker and visible in `docker logs`
- No need for entrypoint script - logging is in application code
### Testing
```bash
# Build image
docker build -t sys8:latest .
# Run with stdio (interactive mode for MCP)
docker run -i --rm sys8:latest
# View logs (when server is running)
docker logs <container-id>
```
### Conclusion
✅ **Current Dockerfile configuration fully complies with Docker MCP Registry requirements and best practices.**
The use of `CMD` instead of `ENTRYPOINT` is:
- ✅ Standard for stdio MCP servers
- ✅ More flexible for users
- ✅ Matches examples in the registry
- ✅ Simpler and cleaner
