Whitepaper · 10 pages · September 2026

# Ansible at Platform Scale

Repository layout, role design, change discipline and pipeline practice for infrastructure you own

[Download the PDF 1.0 MB](https://zcp.zsoftly.ca/downloads/whitepapers/ansible-configuration-management.pdf)

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How to run one Ansible repository across many services and sites. It covers numbered playbooks, site-scoped inventories and group\_vars, and idempotent roles with precheck and opt-in modes. It also covers prune gates with ownership predicates, gated CI runs, Vault, drift detection and six anonymised production lessons.

- Ansible
- Configuration as Code
- CI/CD
- Ansible Vault
- Drift Detection

Role Rules

8

Every role in the repository follows them

Pipeline Stages

4

Validate, dry run, gated deploy, smoke test

Lessons

6

From our own postmortems

Checks

12

Readiness checklist for your repository

Inside

## What the paper covers

- ### Repository Layout

  Shared roles, numbered playbooks and one inventory per site
- ### Variable Layering

  Why a site value in a shared group leaks into the other site, and how to stop it
- ### Role Design Rules

  Idempotent, fail closed, handlers, templates over inline scripts, pinned versions
- ### Safe Pruning

  Diff declared state against live, ownership predicates and prune gates off by default
- ### CI and Secrets

  Site-labelled runners, manual deploys, Vault, and what check mode cannot prove
- ### Drift and Lessons

  Scheduled dry runs, an unmanaged-configuration register and six real incidents

Steps

## The migration, step by step

1. 01

   Assess repository and incidents

   Step 1
2. 02

   Agree layout and variable rules

   Step 2
3. 03

   Pilot one service end to end

   Step 3
4. 04

   Roll out by priority

   Step 4
5. 05

   Hand over and ship unaided

   Step 5

## Get the full paper

10 pages, PDF, 1.0 MB. Your first hour with our engineers is free.

[Download the PDF](https://zcp.zsoftly.ca/downloads/whitepapers/ansible-configuration-management.pdf)

[Book a discovery call](https://calendar.app.google/ceY8b2bxhCYgB1ot9)

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