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# 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
```bash
# 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
```python
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
```bash
# 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 |