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Whitepaper · 10 pages · September 2026

Ansible at Platform Scale

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

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Cover of the Configuration Management at Platform Scale with Ansible whitepaperFree download, no form

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. 01Assess repository and incidentsStep 1
  2. 02Agree layout and variable rulesStep 2
  3. 03Pilot one service end to endStep 3
  4. 04Roll out by priorityStep 4
  5. 05Hand over and ship unaidedStep 5

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