---
last_verified: 2026-03-14
layout: Single Region with HA
description: |
  Reference layout for a single-region deployment with high availability.
  Suitable for most production workloads not requiring cross-region DR.
---

canvas:
  width: 1200
  height: 800

structure:
  tenancy:
    x: 0
    y: 0
    width: 1200
    height: 800

  region:
    x: 20
    y: 40
    width: 1160
    height: 740

  vcn:
    x: 20
    y: 40
    width: 1100
    height: 680

  subnets:
    public_web:
      position: top
      x: 20
      y: 30
      width: 520
      height: 180
      purpose: "Load balancers, WAF"

    private_app:
      position: middle
      x: 20
      y: 230
      width: 520
      height: 200
      purpose: "Application servers, OKE workers"

    private_db:
      position: bottom
      x: 20
      y: 450
      width: 1060
      height: 200
      purpose: "Database instances, Data Safe, Vault"

    private_mgmt:
      position: right
      x: 560
      y: 30
      width: 500
      height: 400
      purpose: "Bastion, monitoring, management"

notes: |
  - Place load balancers in public subnet at top
  - App tier in private subnet in middle
  - Database tier in private subnet at bottom (widest)
  - Management/security services in right column
  - Services flow top-to-bottom: LB → App → DB