# Today's Docker Issues - Summary and Solutions

## Date: 2026-02-15

## Issues Fixed

### 1. Edition 2024 Error
**Problem:** Rust 1.83-alpine didn't support Edition 2024
**Solution:** Updated Dockerfiles to use Rust 1.93-slim
**Files Modified:**
- `backend/docker/Dockerfile`
- `backend/docker/Dockerfile.dev`
**Documentation:** `backend/docker/EDITION2024-FIX.md`

### 2. MongoDB Healthcheck Configuration
**Problem:** Healthcheck timing out, complex command
**Solution:** Simplified healthcheck with 60s startup grace period
**Files Modified:**
- `backend/docker-compose.dev.yml`
**Documentation:** `backend/docker/MONGODB-TROUBLESHOOTING.md`

### 3. MongoDB Disk Space Issue
**Problem:** MongoDB crashing with "No space left on device" error
**Root Cause:** `/var` filesystem was 100% full (not root `/` filesystem)
**Solution:** Freed up space in `/var` filesystem
**Key Insight:** Docker stores volumes in `/var/lib/docker/volumes/`, so `/var` space matters more than root space for MongoDB
**Documentation:** `backend/docker/MONGODB-VAR-FULL-ISSUE.md`

## Lessons Learned

1. **Always check all filesystems** with `df -h`, not just root (`/`)
2. **Docker data location matters** - `/var/lib/docker` by default
3. **Separate mounts have different space** - `/var` can be full while `/` has space
4. **Monitor Docker space usage** regularly with `docker system df`

## Prevention Setup

### Regular Monitoring
Add to crontab:
```bash
# Check disk space every hour
0 * * * * /path/to/normogen/backend/scripts/check-disk-space.sh

# Clean Docker weekly
0 2 * * 0 docker system prune -f --filter "until=168h"
```

### Manual Checks
```bash
# Quick space check
df -h

# Docker space usage
docker system df

# Verify stack is running
./backend/scripts/verify-stack.sh
```

## Documentation Created

1. `backend/docker/EDITION2024-FIX.md` - Edition 2024 fix
2. `backend/docker/MONGODB-TROUBLESHOOTING.md` - MongoDB issues
3. `backend/docker/MONGODB-PERMISSIONS-FIX.md` - Permissions guide
4. `backend/docker/MONGODB-DISKSPACE-FIX.md` - Disk space guide
5. `backend/docker/MONGODB-VAR-FULL-ISSUE.md` - /var space issue
6. `backend/docker/DOCKER-COMMANDS.md` - Docker commands reference
7. `backend/scripts/check-disk-space.sh` - Space monitoring
8. `backend/scripts/verify-stack.sh` - Stack verification
9. `backend/diagnose-mongodb.sh` - MongoDB diagnostics

## Quick Reference

### Start the Stack
```bash
cd backend
docker compose -f docker-compose.dev.yml up -d
```

### Check Status
```bash
docker compose -f docker-compose.dev.yml ps
docker ps | grep normogen
```

### View Logs
```bash
# All services
docker compose -f docker-compose.dev.yml logs -f

# MongoDB only
docker logs -f normogen-mongodb-dev

# Backend only
docker logs -f normogen-backend-dev
```

### Stop the Stack
```bash
docker compose -f docker-compose.dev.yml down
```

### Clean Restart
```bash
docker compose -f docker-compose.dev.yml down -v
docker compose -f docker-compose.dev.yml up -d
```

## Success Indicators

When everything is working, you should see:

1. **Containers running:**
   ```
   $ docker ps | grep normogen
   normogen-mongodb-dev   Up X minutes (healthy)   0.0.0.0:27017->27017/tcp
   normogen-backend-dev   Up X minutes            0.0.0.0:6800->8000/tcp
   ```

2. **MongoDB logs:**
   ```
   {"msg":"Waiting for connections on port 27017"}
   ```

3. **Backend logs:**
   ```
   Server is running on http://0.0.0.0:8000
   ```

4. **Healthcheck:**
   ```
   $ docker inspect normogen-mongodb-dev --format='{{.State.Health.Status}}'
   healthy
   ```

## Git Commits

1. `d63f160` - fix(docker): Update to Rust 1.93 to support Edition 2024
2. `b218594` - fix(docker): Fix MongoDB healthcheck configuration
3. `b068579` - fix(docker): Simplify MongoDB healthcheck and add troubleshooting
4. `f0b5109` - fix(docker): Document MongoDB disk space issue and solutions

## Next Steps

1. Build completed successfully
2. `/var` space issue resolved
3. Verify stack is running with `./backend/scripts/verify-stack.sh`
4. Test API endpoints
5. Continue with Phase 2.4 development

---

**Last Updated:** 2026-02-15
**Status:** All issues resolved