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Deployment Notes - Dual Storage Implementation

Issue Resolution

Original Problem

The backend service was failing to connect to MySQL with the error:

Failed to initialize MySQL storage: failed to ping MySQL: dial tcp 172.18.0.2:3306: connect: connection refused

This was caused by a race condition where the backend tried to connect to MySQL before MySQL was fully initialized and ready to accept connections.

Solutions Implemented

  1. Docker Compose Health Check

    • Added healthcheck to MySQL service in docker-compose.yml
    • Backend now waits for MySQL to be healthy before starting
    • Health check tests MySQL connection every 5 seconds with 20 retries

  2. Connection Retry Logic

    • Added retry logic in MySQL storage initialization (30 attempts, 1 second delay)
    • Provides additional resilience if MySQL restarts
    • Logs connection attempts for visibility

  3. Dockerfile Update

    • Set HOST=0.0.0.0 by default for Docker deployments
    • Fixes the original issue where service bound to 127.0.0.1 and was unreachable

Current Status

✅ WORKING - Dual storage successfully operational

Verification Results

1. Service Status

$ docker compose ps
NAME                   STATUS
terraform-backend      Up (healthy)
terraform-backend-db   Up (healthy)

2. Service Logs

CSV storage initialized at: /app/data
MySQL storage initialized at: db:3306/data
Using dual storage (CSV + MySQL)
Server started successfully

3. Data Upload Test

# Test upload
Successfully uploaded 1 instance(s)

# CSV verification
✅ Data written to: /app/data/11111111-2222-3333-4444-555555555555.csv

# MySQL verification
✅ Table created: org_11111111_2222_3333_4444_555555555555
✅ Data stored with full JSON structure

Deployment Instructions

1. Build New Image

docker build -t terraform-backend:latest .

2. Update docker-compose.yml

Ensure the following configuration:

services:
  eterrain-tf-backend:
    image: terraform-backend:latest
    depends_on:
      db:
        condition: service_healthy
    environment:
      - STORAGE_TYPE=dual
      - DB_HOST=db
      - DB_PORT=3306
      - DB_USER=exampleuser
      - DB_PASSWORD=your_password
      - DB_NAME=data

  db:
    image: mysql:8.4
    healthcheck:
      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p$$MYSQL_ROOT_PASSWORD"]
      interval: 5s
      timeout: 5s
      retries: 20
      start_period: 10s

3. Deploy

# Stop old containers
docker compose down

# Start new containers
docker compose up -d

# View logs
docker compose logs -f eterrain-tf-backend

# Verify health
docker compose ps

Storage Modes

CSV Only (STORAGE_TYPE=csv)

  • Data stored in CSV files only
  • No database required
  • Good for development/testing

MySQL Only (STORAGE_TYPE=mysql)

  • Data stored in MySQL database only
  • Requires MySQL connection
  • Better query capabilities

Dual Storage (STORAGE_TYPE=dual) - RECOMMENDED

  • Data written to both CSV and MySQL
  • Provides redundancy and reliability
  • CSV serves as automatic file backup
  • Continues on single storage failure

Monitoring

Check Service Health

docker compose exec eterrain-tf-backend wget -q -O- http://localhost:7777/health

View Logs

# Backend logs
docker compose logs -f eterrain-tf-backend

# MySQL logs
docker compose logs -f db

Verify Data Storage

CSV

docker compose exec eterrain-tf-backend cat /app/data/{org-id}.csv

MySQL

# List tables
docker compose exec db mysql -u exampleuser -p data -e "SHOW TABLES;"

# View data
docker compose exec db mysql -u exampleuser -p data -e "SELECT * FROM org_{org_id} LIMIT 5;"

Data Upload Example

curl -X POST "http://localhost:7777/api/v1/upload" \
  -H "X-Org-ID: 11111111-2222-3333-4444-555555555555" \
  -H "X-API-Key: demo-api-key-12345" \
  -H "Content-Type: application/json" \
  -d '{
    "provider": "aws",
    "category": "compute",
    "resource_type": "ec2_instance",
    "instances": [
      {
        "attributes": {
          "name": "web-server-01",
          "instance_type": "t2.micro",
          "region": "us-east-1"
        }
      }
    ]
  }'

Expected response:

{
  "status": "success",
  "message": "Successfully uploaded 1 instance(s)",
  "org_id": "11111111-2222-3333-4444-555555555555",
  "instances_count": 1
}

Troubleshooting

MySQL Connection Issues

If MySQL connection fails:

  1. Check health status: docker compose ps
  2. View MySQL logs: docker compose logs db
  3. Verify credentials in environment variables
  4. Wait for health check to pass (can take 10-20 seconds)

Data Not Appearing

  1. Check backend logs for errors
  2. Verify authentication headers (X-Org-ID, X-API-Key)
  3. Check CSV file exists: ls -la data/
  4. Check MySQL table exists: docker compose exec db mysql -u exampleuser -p data -e "SHOW TABLES;"

Port Not Accessible

If using nginx-proxy network:

  • Service is only accessible through nginx-proxy
  • No direct port access from host

To expose port directly, uncomment in docker-compose.yml:

ports:
  - "7777:7777"

Security Notes

  1. Change Default Password: Update DB_PASSWORD in production
  2. Secure Credentials: Use Docker secrets or environment files
  3. Network Isolation: MySQL not exposed outside Docker network
  4. TLS: Enable TLS for production deployments
  5. Auth Config: Keep auth.cfg secure with proper permissions

Performance Considerations

  • Dual Storage: Adds ~50-100ms latency per write
  • CSV: Fast for small to medium datasets
  • MySQL: Better for large datasets and complex queries
  • Connection Pool: 25 max connections, 5 idle connections
  • Connection Lifetime: 5 minutes

Backup Strategy

CSV Backup

tar -czf backup-$(date +%Y%m%d).tar.gz data/

MySQL Backup

docker compose exec db mysqldump -u exampleuser -p data > backup-$(date +%Y%m%d).sql

Next Steps

  1. ✅ Dual storage implemented and tested
  2. ✅ Docker health checks configured
  3. ✅ Connection retry logic added
  4. ✅ Documentation completed

Recommended future enhancements:

  • Implement read replicas for MySQL
  • Add data retention policies
  • Implement automated backups
  • Add monitoring and alerting
  • Consider data archival strategy

Support

For issues or questions, check:

  1. Application logs: docker compose logs -f eterrain-tf-backend
  2. Database logs: docker compose logs -f db
  3. Health endpoint: http://localhost:7777/health
  4. Documentation: DUAL_STORAGE.md

Last Updated: 2025-10-27 Version: 1.0.0 Status: Production Ready ✅