PostgreSQL 18 Logical Replication (Read-Only Subscriber) on CentOS Stream 10|Step-by-Step#postgresql

# 🔁 PostgreSQL 18 Logical Replication (Publisher → Read-Only Subscriber)

## 🌐 Architecture
+ ---------------------- + --------------- +
| Role | IP |
+ ---------------------- + --------------- +
| Publisher | 192.168.136.138 |
| Subscriber (READ-ONLY) | 192.168.136.139 |
+ ---------------------- + --------------- +

Replication user: replicator
Password: admin@123

# ⚡ Physical Sync vs Logical (Read-Only Subscriber)
+ ---------------- + ------------- + -----------------------+
| Feature | Physical Sync | Logical + RO Subscriber|
+ ---------------- + ------------- + -----------------------+
| Granularity | Whole cluster | Table |
| Replica writable | ❌ | ❌ |
| Schema copied | ✅ | ❌ |
| Zero loss | ✅ | ❌ |
| Version upgrade | ❌ | ✅ |
| Use case | HA | Reporting / migration |
+ ---------------- + ------------- + -----------------------+

# 🎉 FINAL RESULT
You now have:
✅ PostgreSQL 18 Logical Replication
✅ CentOS Stream 10
✅ Publisher: 192.168.136.138
✅ Read-Only Subscriber: 192.168.136.139
✅ Publication + Subscription
✅ Automatic data sync
✅ Replica protected from writes
✅ Production-grade reporting replica
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