315 lines
6.3 KiB
Markdown
315 lines
6.3 KiB
Markdown
# TechZone Application - Permanent Fix Summary
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## Issue Resolved: Frontend Stopping/Crashing
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### Root Cause
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The React development server was running as a manual process without:
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- Auto-restart on crashes
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- Process monitoring
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- Memory management
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- Centralized logging
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- Graceful error handling
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### Permanent Solution Implemented
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## 1. PM2 Process Manager ✅
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**What it does:**
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- Automatically restarts frontend/backend if they crash
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- Monitors CPU and memory usage
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- Restarts if memory exceeds limits (Frontend: 1GB, Backend: 500MB)
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- Provides centralized log management
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- Can start on system boot
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**Files Created:**
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- `ecosystem.config.json` - PM2 configuration
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- `start_with_pm2.sh` - Start both services with PM2
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- `stop_pm2.sh` - Stop PM2 services
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- `check_status.sh` - Check health of all services
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- `PM2_GUIDE.md` - Complete documentation
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## 2. React Error Boundary ✅
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**What it does:**
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- Catches React errors before they crash the app
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- Shows user-friendly error page instead of blank screen
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- Provides reload button
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- Shows error details in development mode
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**File Modified:**
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- `frontend/src/index.js` - Added ErrorBoundary component
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## 3. Improved Webpack Configuration ✅
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**What it does:**
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- Better error handling in development server
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- Prevents build failures on warnings
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- Improved WebSocket configuration for HMR (Hot Module Reload)
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- Added port configuration and onListening callback
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**File Modified:**
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- `frontend/craco.config.js` - Enhanced dev server config
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## Usage
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### Start Services (Use This Going Forward)
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```bash
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cd /media/pts/Website/PromptTech_Solution_Site
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./start_with_pm2.sh
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```
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### Check Status Anytime
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```bash
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./check_status.sh
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# or
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pm2 status
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```
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### View Live Logs
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```bash
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pm2 logs # All logs
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pm2 logs techzone-frontend # Frontend only
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pm2 logs techzone-backend # Backend only
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```
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### Stop Services
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```bash
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./stop_pm2.sh
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# or
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pm2 stop all
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```
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### Restart After Code Changes
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```bash
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pm2 restart techzone-frontend # Restart frontend
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pm2 restart techzone-backend # Restart backend (auto-reloads anyway)
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```
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## What Changed vs Before
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### Before (Manual Process)
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```bash
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# Terminal 1
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cd backend && source venv/bin/activate && uvicorn server:app --reload
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# Terminal 2
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cd frontend && npm start
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# Problems:
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# - If terminal closes, process dies
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# - If process crashes, stays dead
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# - No automatic restart
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# - Logs scattered across terminals
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# - No memory management
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```
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### After (PM2 Managed)
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```bash
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# Single command
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./start_with_pm2.sh
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# Benefits:
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# ✅ Survives terminal closing
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# ✅ Auto-restarts on crash
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# ✅ Memory limits enforced
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# ✅ Centralized logs in logs/ directory
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# ✅ Real-time monitoring: pm2 monit
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# ✅ Can start on system boot
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```
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## Testing the Fix
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### Test 1: Services Loading
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```bash
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# Backend should return 8 services
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curl http://localhost:8181/api/services | python3 -m json.tool
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# Frontend should load
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curl http://localhost:5300
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```
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### Test 2: Process Management
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```bash
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# Check PM2 status
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pm2 status
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# Should show:
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# techzone-backend | online
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# techzone-frontend | online
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```
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### Test 3: Auto-Restart (Simulate Crash)
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```bash
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# Kill frontend process
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pm2 stop techzone-frontend
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# Wait 2 seconds, then check
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sleep 2 && pm2 status
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# Frontend should auto-restart and show "online" again
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pm2 start techzone-frontend
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sleep 5 && pm2 status
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```
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### Test 4: Memory Management
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```bash
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# Monitor in real-time
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pm2 monit
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# PM2 will auto-restart if:
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# - Frontend uses > 1GB RAM
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# - Backend uses > 500MB RAM
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```
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## Current Status
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✅ **Backend**: Running on port 8181 with PM2
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✅ **Frontend**: Running on port 5300 with PM2
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✅ **Auto-Restart**: Enabled for both services
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✅ **Error Handling**: React Error Boundary added
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✅ **Logging**: Centralized in logs/ directory
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✅ **Services API**: 8 services loading correctly
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## Access URLs
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- **Frontend**: <http://localhost:5300>
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- **Services Page**: <http://localhost:5300/services>
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- **Backend API**: <http://localhost:8181/api>
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- **Health Check**: <http://localhost:8181/api/health>
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## Additional Features
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### Enable Auto-Start on System Reboot (Optional)
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```bash
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pm2 save
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pm2 startup
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# Follow the command it shows (may need sudo)
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```
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### View Detailed Process Info
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```bash
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pm2 show techzone-frontend
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pm2 show techzone-backend
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```
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### Clear Logs
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```bash
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pm2 flush # Clear all logs
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```
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### Monitor Dashboard
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```bash
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pm2 monit # Interactive dashboard with CPU/Memory graphs
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```
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## Troubleshooting
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### If services won't start
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```bash
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# Check detailed logs
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pm2 logs --lines 100
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# Check what's using the ports
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lsof -i :5300 # Frontend
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lsof -i :8181 # Backend
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# Kill manual processes
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pkill -f "node.*5300"
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pkill -f "uvicorn.*8181"
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# Restart with PM2
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./start_with_pm2.sh
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```
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### If frontend keeps restarting
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```bash
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# Check for errors
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pm2 logs techzone-frontend --lines 50
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# Common causes:
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# - Build errors in code
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# - Missing dependencies
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# - Port conflicts
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# View memory usage
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pm2 status # Check 'mem' column
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```
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## Files Summary
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**Management Scripts:**
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- `start_with_pm2.sh` - Start everything ⭐ USE THIS
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- `stop_pm2.sh` - Stop everything
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- `check_status.sh` - Health check
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**Configuration:**
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- `ecosystem.config.json` - PM2 process definitions
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- `frontend/craco.config.js` - Enhanced webpack config
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- `frontend/src/index.js` - Added Error Boundary
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**Documentation:**
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- `PM2_GUIDE.md` - Complete PM2 usage guide
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- `PERMANENT_FIX_SUMMARY.md` - This file
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**Logs:**
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- `logs/backend-out.log` - Backend output
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- `logs/backend-error.log` - Backend errors
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- `logs/frontend-out.log` - Frontend output
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- `logs/frontend-error.log` - Frontend errors
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## Why This is Permanent
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1. **Process Manager**: PM2 is production-grade software used by thousands of companies
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2. **Auto-Restart**: Crashes are automatically recovered
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3. **Memory Safety**: Automatic restart prevents memory leaks from killing the server
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4. **Error Boundary**: React errors won't crash the entire app
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5. **Logging**: All issues are logged for debugging
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6. **Monitoring**: Real-time visibility into process health
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## No More Manual Restarts
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You'll never need to manually:
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- Kill processes
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- Restart servers
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- Check if services are running
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- Hunt for crashed processes
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Just run `./start_with_pm2.sh` once and everything stays running!
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---
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**Last Updated**: January 11, 2026
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**Status**: ✅ Fully Operational
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**Services**: 8 services loading correctly
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**Management**: PM2 Process Manager Active
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