metabuilder/frontends/emailclient/PHASE_8_INDEX.md

Phase 8: Redis Container - Complete Index

Overview

Phase 8 implements a production-ready Redis 7 container configured as a Celery broker and result backend for the Email Client system. This document serves as an index to all Phase 8 deliverables.

Quick Navigation

Document	Purpose	Audience
README	[This page] Container quick reference	Everyone
Deployment	docs/DEPLOYMENT.md	DevOps, System Admins
Summary	PHASE_8_REDIS_SUMMARY.md	Architects, Developers
Container Docs	deployment/docker/redis/README.md	DevOps, Platform Engineers
File Manifest	PHASE_8_FILES.txt	Reference

Files Created

Redis Container (8 files)

deployment/docker/redis/
├── Dockerfile                 Production Redis 7 Alpine image
├── redis.conf                Complete Redis configuration
├── docker-entrypoint.sh       Container initialization (executable)
├── backup.sh                  Backup/restore tool (executable)
├── monitor.sh                 Monitoring dashboard (executable)
├── README.md                  Container documentation
├── .env.redis                 Environment variables template
└── .dockerignore              Build context exclusions

Docker Compose (3 files)

./
├── docker-compose.yml         Updated with Redis + email-service
├── docker-compose.dev.yml     Development overrides (NEW)
└── docker-compose.prod.yml    Production overrides (NEW)

Documentation (4 files)

./
├── docs/DEPLOYMENT.md         Complete deployment guide (NEW)
├── PHASE_8_REDIS_SUMMARY.md   Implementation summary (NEW)
├── PHASE_8_FILES.txt          File manifest (NEW)
└── PHASE_8_INDEX.md           This file (NEW)

Core Components

1. Dockerfile

Location: deployment/docker/redis/Dockerfile

• Redis 7 Alpine-based image
• Health checks with native Docker support
• Entrypoint script integration
• Non-root user execution
• Size: 41 lines

Key Features:

FROM redis:7-alpine
RUN apk add --no-cache curl bash ca-certificates
COPY redis.conf /usr/local/etc/redis/redis.conf
HEALTHCHECK --interval=30s redis-cli --raw incr ping
EXPOSE 6379
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["redis-server", "/usr/local/etc/redis/redis.conf"]

2. Redis Configuration

Location: deployment/docker/redis/redis.conf

Memory Management:

• Max memory: 512MB
• Eviction policy: allkeys-lru
• Memory sampling: 5 entries

Persistence:

• RDB snapshots: 15min/1key, 5min/10keys, 1min/10k keys
• AOF journaling with everysec fsync
• Auto-rewrite at 64MB or 100% growth
• LZF compression enabled

Authentication:

• Password-based via requirepass directive
• Substituted from REDIS_PASSWORD environment variable

Size: 223 lines with extensive documentation

3. Entrypoint Script

Location: deployment/docker/redis/docker-entrypoint.sh

• Environment variable substitution
• Redis readiness checks (30-attempt loop)
• Configuration initialization
• Background health monitoring
• Error handling and logging

Size: 124 lines Executable: Yes (chmod +x)

4. Backup Tool

Location: deployment/docker/redis/backup.sh

Commands:

• backup.sh backup - Create RDB backup
• backup.sh restore <file> - Restore from backup
• backup.sh analyze - Analyze database
• backup.sh list - List available backups

Features:

• BGSAVE with progress monitoring
• MD5 and SHA256 checksums
• Manifest generation
• 30-day retention policy
• Integrity verification
• Color-coded output

Size: 306 lines Executable: Yes (chmod +x)

5. Monitoring Script

Location: deployment/docker/redis/monitor.sh

Commands:

• monitor.sh health - One-time health check
• monitor.sh monitor - Real-time dashboard (5s refresh)
• monitor.sh slowlog - Show slow queries
• monitor.sh stats - Command statistics

Metrics Displayed:

• Memory usage with warning thresholds
• Connected clients and blocked clients
• Commands per second
• Database size and key count
• Eviction statistics
• Persistence status
• Uptime and role

Size: 329 lines Executable: Yes (chmod +x)

6. Environment Template

Location: deployment/docker/redis/.env.redis

Categories:

• Redis authentication
• Redis memory configuration
• Redis persistence settings
• Celery broker configuration
• Celery task configuration
• Email service integration
• Development/debugging flags

Size: 80 lines with documentation

Docker Compose Configuration

Updated: docker-compose.yml

redis:
  build:
    context: ./deployment/docker/redis
    dockerfile: Dockerfile
  image: emailclient-redis:latest
  environment:
    REDIS_PASSWORD: ${REDIS_PASSWORD:-redis_development_password}
    REDIS_MAXMEMORY: ${REDIS_MAXMEMORY:-512mb}
    REDIS_MAXMEMORY_POLICY: ${REDIS_MAXMEMORY_POLICY:-allkeys-lru}
  healthcheck:
    test: ["CMD", "redis-cli", "--raw", "incr", "ping"]
    interval: 30s
    timeout: 10s
    retries: 3
    start_period: 5s
  volumes:
    - redis-data:/data
  networks:
    - emailclient-net

New: docker-compose.dev.yml

Development-specific overrides:

• Default passwords for quick setup
• Debug logging enabled
• Suitable for local development

Usage:

docker-compose -f docker-compose.yml -f docker-compose.dev.yml up

New: docker-compose.prod.yml

Production-specific configuration:

• Strong password requirements
• Increased memory allocations
• Resource limits and reservations
• Enhanced logging (100MB max, 10 files)
• Volatile eviction policy
• External volume mounts
• Comprehensive monitoring

Usage:

docker-compose -f docker-compose.yml -f docker-compose.prod.yml up -d

Quick Start

Development

# 1. Build
docker-compose build redis

# 2. Start
docker-compose up -d redis

# 3. Verify
docker-compose exec redis redis-cli ping
# Output: PONG

# 4. Monitor
./deployment/docker/redis/monitor.sh health

Production

# 1. Generate password
export REDIS_PASSWORD=$(openssl rand -base64 32)

# 2. Build
docker-compose build

# 3. Start
docker-compose -f docker-compose.yml \
               -f docker-compose.prod.yml \
               up -d

# 4. Verify
docker-compose ps
docker-compose exec redis redis-cli -a $REDIS_PASSWORD ping

Integration

Email Service Connection

# services/email_service/celery_app.py
from celery import Celery

app = Celery('email_service')
app.conf.update(
    broker_url=os.getenv('CELERY_BROKER_URL'),
    result_backend=os.getenv('CELERY_RESULT_BACKEND'),
    task_serializer='json',
    result_serializer='json',
)

@app.task
def sync_imap_account(account_id):
    # Background task
    pass

# Usage
sync_imap_account.delay(account_id=123)

Environment Variables

# Required
CELERY_BROKER_URL=redis://:password@redis:6379/0
CELERY_RESULT_BACKEND=redis://:password@redis:6379/0

# Optional
REDIS_PASSWORD=redis_development_password
REDIS_MAXMEMORY=512mb
REDIS_MAXMEMORY_POLICY=allkeys-lru

Key Features

Memory Management

• Configurable limit (default: 512MB)
• LRU eviction when limit reached
• Automatic cleanup of least-used keys

Persistence

• RDB snapshots for point-in-time recovery
• AOF journaling for durability
• Automatic recovery on startup

Monitoring

• Real-time dashboard with 5s refresh
• Health checks every 30 seconds
• Slow query logging
• Command statistics

Backup & Recovery

• Automated BGSAVE with progress monitoring
• Full/partial database restore
• Checksum verification
• 30-day retention policy

Security

• Password authentication
• Non-root user execution
• Volume-based persistence
• Network isolation via docker bridge

Monitoring Commands

# Health check
./deployment/docker/redis/monitor.sh health

# Real-time monitoring
./deployment/docker/redis/monitor.sh monitor

# Slow query log
./deployment/docker/redis/monitor.sh slowlog

# Command statistics
./deployment/docker/redis/monitor.sh stats

# Manual health check
docker-compose exec redis redis-cli ping

# Memory stats
docker-compose exec redis redis-cli INFO memory

# Database size
docker-compose exec redis redis-cli DBSIZE

# Check eviction
docker-compose exec redis redis-cli INFO stats | grep evicted

Backup Operations

# Create backup
./deployment/docker/redis/backup.sh backup
# Output: redis-data/redis_backup_20260124_020000.rdb

# Restore from backup
./deployment/docker/redis/backup.sh restore ./redis_backup_20260124_020000.rdb

# List backups
./deployment/docker/redis/backup.sh list

# Analyze database
./deployment/docker/redis/backup.sh analyze

# Schedule automated backups
0 2 * * * /path/to/backup.sh backup

Troubleshooting

Container Won't Start

# Check logs
docker-compose logs redis

# Verify configuration
docker build -t test-redis deployment/docker/redis/
docker run --rm test-redis redis-cli --help

High Memory Usage

# Check memory stats
docker-compose exec redis redis-cli INFO memory

# Identify large keys
docker-compose exec redis redis-cli --bigkeys

# Check eviction events
./deployment/docker/redis/monitor.sh analyze

Slow Performance

# Check slow log
./deployment/docker/redis/monitor.sh slowlog

# Check command statistics
./deployment/docker/redis/monitor.sh stats

# Monitor in real-time
./deployment/docker/redis/monitor.sh monitor

Performance Characteristics

Baseline Performance

• Empty container: ~2-3MB RAM
• 1M keys (avg 100B): ~100-150MB
• Throughput: 50-100k ops/sec

Scaling Limits

• Single instance suitable for <50k QPS
• Scaling options: Cluster, Sentinel, Managed
• Current configuration: Email client with moderate load

Security Considerations

Development

• Default password acceptable
• Debug logging enabled
• Local network only

Production

• Strong random password: openssl rand -base64 32
• Volatile eviction (TTL keys only)
• External persistent storage
• Resource limits enforced
• Comprehensive logging
• ACL configuration recommended

Documentation Index

Document	Location	Content
Deployment Guide	docs/DEPLOYMENT.md	Complete setup and operational guide
Implementation Summary	PHASE_8_REDIS_SUMMARY.md	Architecture, features, and configuration
Container README	deployment/docker/redis/README.md	Build, run, and configure container
File Manifest	PHASE_8_FILES.txt	Complete file listing and descriptions
This Index	PHASE_8_INDEX.md	Quick navigation and reference

Requirements Checklist

• Redis 7+ official image (7-alpine)
• Configure as Celery broker and result backend
• Set memory limit (512MB)
• Enable persistence (RDB snapshots)
• Configure maxmemory-policy: allkeys-lru
• Set requirepass for authentication
• Volume mount for data persistence
• Health check on port 6379
• Expose port 6379
• docker-compose service definition with environment variables
• Production-ready documentation
• Backup and recovery tooling
• Monitoring and health checks
• Development and production configurations

Testing Checklist

• Dockerfile builds successfully
• Container starts and passes health checks
• Redis CLI accessible
• Environment variables substituted
• Health check responds quickly
• RDB/AOF persistence works
• Backup tool creates valid backups
• Monitor tool shows metrics
• Docker Compose integration complete
• Email-service can connect with password

Next Steps

1. Review Documentation: Start with docs/DEPLOYMENT.md
2. Build Container: docker-compose build redis
3. Start Development: docker-compose up -d
4. Verify Health: ./deployment/docker/redis/monitor.sh health
5. Test Backup: ./deployment/docker/redis/backup.sh backup
6. Deploy Production: Use docker-compose.prod.yml
7. Setup Monitoring: Schedule monitor.sh and backup.sh jobs

References

• Redis Official Documentation
• Redis Persistence Guide
• Celery Task Queue
• Docker Compose
• Docker Best Practices

Support

For issues or questions:

1. Check PHASE_8_REDIS_SUMMARY.md troubleshooting section
2. Review deployment/docker/redis/README.md for detailed configuration
3. Run ./deployment/docker/redis/monitor.sh health for diagnostics

Status

Phase 8: COMPLETE ✓ Version: 1.0.0 Release Date: 2026-01-24 Status: Production-Ready

All requirements satisfied. Ready for development and production deployment.

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Last Updated: 2026-01-24 Maintainer: Email Client Development Team License: Project License