PrestaShop Behind a Load Balancer: What Breaks and How to Fix It

Short summary

Running PrestaShop behind a load balancer exposes architectural flaws: shared caches desync across nodes and single pages fire 800–2000 SQL queries. Real-world fix: sticky sessions pin users to single nodes with local Redis caching (10-min TTL), a blacklist prevents caching high-frequency tables (cart, stock, orders), and deployment uses rsync from a central machine. Manual module review and careful schema management beat distributed caching complexity.

• •PrestaShop fires 800–2000 queries per page; load balancer cache desync creates stale data across nodes
• •Solution: sticky sessions + local Redis (10-min TTL) + table blacklist for high-frequency data
• •Centralized deployment via rsync, manual module review, and NFS-only for shared assets

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