ReddRadar
Agent skill
redis-replication
Master Redis replication - master-replica setup, Sentinel for HA, failover handling, and read scaling patterns
Install this agent skill to your Project
npx add-skill https://github.com/pluginagentmarketplace/custom-plugin-redis/tree/main/skills/redis-replication
SKILL.md
Redis Replication Skill
Master-Replica Setup
Replica Configuration
replicaof master_ip 6379
masterauth your_password
replica-read-only yes
replica-serve-stale-data yes
Commands
REPLICAOF master_ip 6379 # Set master
REPLICAOF NO ONE # Promote to master
INFO replication # Check status
Sentinel (Auto-Failover)
Architecture
Sentinel 1 Sentinel 2 Sentinel 3
↓ ↓ ↓
└──────── Monitor ───────────┘
↓
Master ←──→ Replica 1 ←──→ Replica 2
Configuration
# sentinel.conf
port 26379
sentinel monitor mymaster 192.168.1.10 6379 2
sentinel auth-pass mymaster password
sentinel down-after-milliseconds mymaster 5000
sentinel failover-timeout mymaster 60000
sentinel parallel-syncs mymaster 1
Commands
# On Sentinel port
SENTINEL masters
SENTINEL get-master-addr-by-name mymaster
SENTINEL failover mymaster
SENTINEL replicas mymaster
Monitoring
INFO replication
# role:master|slave
# connected_slaves:2
# slave0:ip=...,port=...,state=online,offset=...,lag=0
Assets
sentinel.conf- Sentinel configurationdocker-compose-ha.yml- HA Docker setup
References
REPLICATION_GUIDE.md- Setup guide
Troubleshooting
Replica Not Syncing
INFO replication # Check master_link_status
Fix: Check network, password, and firewall
Split-Brain Prevention
min-replicas-to-write 1
min-replicas-max-lag 10
Failover Not Triggering
Check: Quorum (need majority of Sentinels)
Error Codes
| Code | Name | Recovery |
|---|---|---|
| R001 | MASTERDOWN | Check master or failover |
| R002 | SYNC_FAILED | Check network/auth |
| R003 | QUORUM_LOST | Restore Sentinel majority |
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