21CTO

Aug 10, 2026 · Databases

Build a High‑Availability PostgreSQL Cluster with Streaming Replication and Read‑Write Splitting from Scratch

This guide walks through the complete process of designing, configuring, and operating a PostgreSQL primary‑standby setup with streaming replication, choosing between asynchronous and synchronous modes, implementing read‑write splitting via application routing or PgBouncer, and handling monitoring, failover, and common pitfalls for production‑grade high availability.