Configuration Management Fundamentals
Configuration management keeps systems in a known, consistent state by declaring desired configurations in code and automatically enforcing them. It eliminates manual drift, makes infrastructure reproducible, and provides an audit trail of what changed, when, and why.
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Intro
Configuration Management Fundamentals
Configuration management keeps a system's known state understandable and controlled as people change it. You identify what matters, define an approved state, control changes, record what happened, and check the result.
Without that discipline, a working server can become a mystery. A package update, permission change, or undocumented exception may alter its behavior. The immediate change may look harmless. The accumulated differences make failures harder to explain and recovery harder to repeat.
The core mental model
Think of configuration management as a feedback loop:
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Sources
- https://csrc.nist.gov/pubs/sp/800/128/upd1/final
Supports
- Configuration management as a discipline for managing and monitoring information-system configurations while supporting business functions
- Configuration items, baselines, configuration control, status accounting, verification, monitoring, and organizational roles
- Change proposals, impact analysis, testing, approval, implementation, documentation, and monitoring as connected activities
- Drift investigation, remediation, and baseline maintenance
- Security as an integral concern within overall configuration management
- https://csrc.nist.gov/glossary/term/configuration_control
Supports
- Configuration control as control over modifications to hardware, firmware, software, and documentation
- Control before, during, and after system implementation
- https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final
Supports
- The configuration-management control family and its coverage of policy, baselines, change control, impact analysis, access restrictions, settings, inventories, and planning
- Baselines as reviewed and agreed specifications that support future builds, releases, and changes
- Retention of previous configurations to support rollback
- Configuration items spanning hardware, software, firmware, and documentation across the system life cycle
- Review, approval, implementation, documentation, and monitoring of controlled changes
- https://docs.ansible.com/projects/ansible-core/devel/playbook_guide/playbooks_intro.html
Supports
- Playbooks as repeatable configuration-management and deployment definitions
- Desired-state declaration and idempotent module behavior
- The limit that not all modules and playbooks are idempotent
- Ordered execution, change reporting, check mode, and verification options