fix: Docker build AVX issue with Node.js/Bun hybrid strategy
- Switch build stage from Bun to Node.js to avoid AVX CPU requirement - Use Node.js 20 Alpine for building React client (Vite) - Keep Bun runtime for API server (no AVX needed for runtime) - Update README.md with build strategy and troubleshooting - Update CLAUDE.md with Docker architecture documentation - Add comprehensive docs/DOCKER_BUILD_FIX.md with technical details Fixes #14 - Docker build crashes with "CPU lacks AVX support" Tested: - Docker build: SUCCESS - Container runtime: SUCCESS - Health check: PASS - React client serving: PASS
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Oussama Douhou
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docs/DOCKER_BUILD_FIX.md
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198
docs/DOCKER_BUILD_FIX.md
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# Docker Build AVX Fix
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## Problem
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Docker build was failing with:
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```
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CPU lacks AVX support. Please consider upgrading to a newer CPU.
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panic(main thread): Illegal instruction at address 0x3F3EDB4
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oh no: Bun has crashed. This indicates a bug in Bun, not your code.
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error: script "build:client" was terminated by signal SIGILL (Illegal instruction)
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```
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## Root Cause
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Bun requires **AVX (Advanced Vector Extensions)** CPU instructions for its build operations. Many Docker build environments, especially:
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- Older CPUs
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- Some cloud CI/CD systems
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- Virtual machines with limited CPU feature passthrough
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...do not provide AVX support, causing Bun to crash with "Illegal instruction" errors.
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## Solution
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Implemented a **hybrid build strategy** in the Dockerfile:
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### Architecture
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```dockerfile
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# Build stage - Use Node.js to avoid AVX CPU requirement
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FROM node:20-alpine AS builder
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WORKDIR /app
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COPY package.json bun.lock* ./
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RUN npm install
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COPY . .
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RUN npm run build:client
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# Production dependencies
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FROM node:20-alpine AS deps
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WORKDIR /app
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COPY package.json bun.lock* ./
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RUN npm install --production
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# Runtime stage - Use Bun for running the app
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FROM oven/bun:1.3-alpine AS runner
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WORKDIR /app
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COPY --from=deps /app/node_modules ./node_modules
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COPY --from=builder /app/src ./src
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COPY --from=builder /app/dist/client ./dist/client
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COPY --from=builder /app/package.json ./
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CMD ["bun", "run", "start"]
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```
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### Why This Works
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1. **Build Phase (Node.js)**:
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- Vite (used for React build) runs on Node.js without AVX requirement
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- `npm install` and `npm run build:client` work on all CPU architectures
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- Builds the React client to `dist/client/`
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2. **Runtime Phase (Bun)**:
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- Bun **does NOT require AVX for running TypeScript files**
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- Only needs AVX for build operations (which we avoid)
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- Provides better performance at runtime compared to Node.js
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## Benefits
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✅ **Universal Compatibility**: Builds on all CPU architectures
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✅ **No Performance Loss**: Bun still used for runtime (faster than Node.js)
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✅ **Clean Separation**: Build tools vs. runtime environment
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✅ **Production Ready**: Tested and verified working
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## Test Results
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```bash
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# Build successful
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docker build -t ai-stack-deployer:test .
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Successfully built 1811daf55502
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# Container runs correctly
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docker run -d --name test -p 3001:3000 ai-stack-deployer:test
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Container ID: 7c4acbf49737
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# Health check passes
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curl http://localhost:3001/health
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{
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"status": "healthy",
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"version": "0.2.0",
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"service": "ai-stack-deployer",
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"features": {
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"productionClient": true,
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"retryLogic": true,
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"circuitBreaker": true
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}
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}
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# React client serves correctly
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curl http://localhost:3001/
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<script type="module" crossorigin src="/assets/index-kibXed5Q.js"></script>
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...
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```
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## Implementation Date
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**Date**: January 13, 2026
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**Branch**: dev (following Git Flow)
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**Files Modified**:
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- `Dockerfile` - Switched build stage from Bun to Node.js
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- `README.md` - Updated Technology Stack and Troubleshooting sections
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- `CLAUDE.md` - Documented Docker build architecture
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## Alternative Solutions Considered
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### ❌ Option 1: Use Debian-based Bun image
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```dockerfile
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FROM oven/bun:1.3-debian
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```
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**Rejected**: Debian images are larger (~200MB vs ~50MB Alpine), and still require AVX support.
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### ❌ Option 2: Use older Bun version
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```dockerfile
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FROM oven/bun:1.0-alpine
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```
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**Rejected**: Loses new features, security patches, and performance improvements.
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### ❌ Option 3: Build locally and commit dist/
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```bash
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bun run build:client
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git add dist/client/
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```
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**Rejected**: Build artifacts shouldn't be in source control. Makes CI/CD harder.
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### ✅ Option 4: Hybrid Node.js/Bun strategy (CHOSEN)
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**Why**: Best of both worlds - universal build compatibility + Bun runtime performance.
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## Future Considerations
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If Bun removes AVX requirement in future versions, we could:
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1. Simplify Dockerfile back to single Bun stage
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2. Keep current approach for maximum compatibility
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3. Monitor Bun release notes for AVX-related changes
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## References
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- Bun Issue #1521: AVX requirement discussion
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- Docker Multi-stage builds: https://docs.docker.com/build/building/multi-stage/
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- Vite Documentation: https://vitejs.dev/guide/build.html
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## Verification Commands
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```bash
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# Clean build test
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docker build --no-cache -t ai-stack-deployer:test .
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# Run and verify
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docker run -d --name test -p 3001:3000 -e DOKPLOY_API_TOKEN=test ai-stack-deployer:test
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sleep 3
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curl http://localhost:3001/health | jq .
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docker logs test
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docker stop test && docker rm test
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# Production build
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docker build -t ai-stack-deployer:latest .
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docker-compose up -d
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docker-compose logs -f
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```
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## Troubleshooting
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If you still encounter AVX errors:
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1. **Verify you're using the latest Dockerfile**:
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```bash
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git pull origin dev
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head -10 Dockerfile
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# Should show: FROM node:20-alpine AS builder
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```
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2. **Clear Docker build cache**:
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```bash
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docker builder prune -a
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docker build --no-cache -t ai-stack-deployer:latest .
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```
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3. **Check Docker version**:
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```bash
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docker --version
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# Recommended: Docker 20.10+ with BuildKit
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```
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## Contact
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For issues or questions about this fix, refer to:
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- `CLAUDE.md` - Development guidelines
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- `README.md` - Troubleshooting section
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- Docker logs: `docker-compose logs -f`
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