DragonFly Cache Cluster Connection Guide

Cluster Nodes

Node 1: localhost:18000 (Master)
Node 2: localhost:18001 (Replica)
Node 3: localhost:18002 (Replica)

Connection Details

Protocol: Redis-compatible
Max Memory: 50GB per node
Persistence: RDB snapshots

Redis-CLI Examples

# Connect to master node
redis-cli -p 18000

# Cluster info
redis-cli -p 18000 info memory

# Set/get example
redis-cli -p 18000 SET nova:session:123 '{"data": "test"}'
redis-cli -p 18000 GET nova:session:123

# Monitor all nodes
redis-cli -p 18000 monitor
redis-cli -p 18001 monitor
redis-cli -p 18002 monitor

Python Client Example

import redis

# Connect to DragonFly cluster
# DragonFly is Redis-compatible, use standard redis client

# Master node connection
master = redis.Redis(host='localhost', port=18000, decode_responses=True)

# Replica connections  
replica1 = redis.Redis(host='localhost', port=18001, decode_responses=True)
replica2 = redis.Redis(host='localhost', port=18002, decode_responses=True)

# Basic operations
master.set('nova:working_memory', 'cached_data', ex=3600)  # 1 hour expiration
value = master.get('nova:working_memory')
print(f"Cached value: {value}")

# Pipeline for batch operations
pipe = master.pipeline()
pipe.set('key1', 'value1')
pipe.set('key2', 'value2') 
pipe.execute()

Health Checks

# Check all nodes
redis-cli -p 18000 ping  # Should return PONG
redis-cli -p 18001 ping
redis-cli -p 18002 ping

# Memory usage
redis-cli -p 18000 info memory | grep used_memory_human

# Persistence status
redis-cli -p 18000 info persistence | grep rdb_last_save_time

Configuration Notes

Data Directory: /data/dragonfly/node*/data/
Snapshot Frequency: Automatic based on changes
Max Memory: 50GB per node (configurable)
Replication: Async replication between nodes

Security

❗ Localhost binding only
❗ No authentication required
❗ Monitor memory usage to prevent OOM
❗ Regular snapshot verification recommended

Last Updated: September 4, 2025