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95 lines
1.9 KiB
Markdown
95 lines
1.9 KiB
Markdown
---
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layout: page
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title: "Redis High Availability (Optional)"
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permalink: /redis-ha/
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nav_order: 7
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---
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# Redis High Availability
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**Note:** This is optional for homelab setups. Single Redis instance is sufficient for most use cases.
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## When You Need HA
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Consider Redis HA if:
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- Running production workloads
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- Uptime > 99.9% required
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- Can't afford to lose queued tasks
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- Multiple workers across machines
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## Redis Sentinel (Recommended)
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### Setup
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```yaml
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# docker-compose.yml
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version: '3.8'
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services:
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redis-master:
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image: redis:7-alpine
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command: redis-server --maxmemory 2gb
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redis-replica:
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image: redis:7-alpine
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command: redis-server --slaveof redis-master 6379
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redis-sentinel-1:
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image: redis:7-alpine
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command: redis-sentinel /etc/redis/sentinel.conf
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volumes:
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- ./sentinel.conf:/etc/redis/sentinel.conf
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```
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**sentinel.conf:**
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```conf
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sentinel monitor mymaster redis-master 6379 2
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sentinel down-after-milliseconds mymaster 5000
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sentinel parallel-syncs mymaster 1
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sentinel failover-timeout mymaster 10000
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```
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### Application Configuration
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```yaml
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# worker-config.yaml
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redis_addr: "redis-sentinel-1:26379,redis-sentinel-2:26379"
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redis_master_name: "mymaster"
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```
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## Redis Cluster (Advanced)
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For larger deployments with sharding needs.
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```yaml
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# Minimum 3 masters + 3 replicas
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services:
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redis-1:
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image: redis:7-alpine
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command: redis-server --cluster-enabled yes
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redis-2:
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# ... similar config
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```
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## Homelab Alternative: Persistence Only
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**For most homelabs, just enable persistence:**
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```yaml
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# docker-compose.yml
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services:
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redis:
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image: redis:7-alpine
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command: redis-server --appendonly yes
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volumes:
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- redis_data:/data
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volumes:
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redis_data:
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```
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This ensures tasks survive Redis restarts without full HA complexity.
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---
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**Recommendation:** Start simple. Add HA only if you experience actual downtime issues.
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