This Kubernetes template deploys a stable, persistent, and production-grade PostgreSQL database using StatefulSets, Headless Services, and Persistent Volumesdesigned specifically for cloud-native and Kubernetes-first environments. It eliminates common database pitfalls in Kubernetes such as data loss, unstable networking, and insecure configuration.

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What This Template Creates for Your Kubernetes Cluster

This PostgreSQL StatefulSet template provides a clean, modular database deployment without fragile workarounds.

Database Infrastructure

• PostgreSQL 15 (Alpine) Lightweight, production-ready relational database
• StatefulSet Guarantees stable Pod identity (postgres-0) and ordered lifecycle
• Persistent Volume Claim (PVC) Ensures data survives Pod restarts and rescheduling
• ReadWriteOnce storage Safe disk attachment for database workloads

Networking & Access

• Headless Service (clusterIP: None)

  • Enables direct Pod DNS resolution

  • Required for backups, replication, and database-aware clients

  • Resolves to stable Pod names like:

    postgres-0.postgres-headless
    

Configuration & Security

• ConfigMap
  • Database name
  • Database user
• Kubernetes Secret
  • Database password (not hardcoded)
• Environment-based injection
  • Clean separation between code and credentials

Health & Stability

• Readiness Probe (pg_isready)
  • Ensures traffic is only sent when PostgreSQL is fully ready
• Sticky storage
  • Data automatically reattaches even after Pod recreation

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Key Features of This PostgreSQL Kubernetes Deployment

Production-Ready Built using Kubernetes best practices for stateful workloads
Persistent Data Safety Data is never lost when Pods restart or move between nodes
Predictable Networking Stable DNS and Pod identity via Headless Service