# Infrastructure Guides

> [crefft](/index.md) > Infrastructure

Style guides for operating systems, infrastructure-as-code, and container orchestration.

## Operating Systems

| Platform       | Guide                                             | Description                            |
| -------------- | ------------------------------------------------- | -------------------------------------- |
| Fundamentals   | [os/README.md](/guides/infrastructure/os.md)      | Cross-platform concepts and comparison |
| Linux (Debian) | [os/linux.md](/guides/infrastructure/os/linux.md) | Debian 13/14, systemd, kernel tuning   |

## Services

| Service  | Guide                                                               | Description                              |
| -------- | ------------------------------------------------------------------- | ---------------------------------------- |
| Overview | [services/README.md](/guides/infrastructure/services.md)            | Service index, maturity, and roadmap     |
| SSH      | [services/ssh.md](/guides/infrastructure/services/ssh.md)           | SSH server hardening                     |
| NTP      | [services/ntp.md](/guides/infrastructure/services/ntp.md)           | Time synchronization with chrony (draft) |
| DNS      | [services/dns.md](/guides/infrastructure/services/dns.md)           | Resolver and local DNS (draft)           |
| Firewall | [services/nftables.md](/guides/infrastructure/services/nftables.md) | nftables firewall configuration (draft)  |
| Logging  | [services/logging.md](/guides/infrastructure/services/logging.md)   | Centralized logging (draft)              |

## Infrastructure as Code

| Tool    | Guide                                           | Description                             |
| ------- | ----------------------------------------------- | --------------------------------------- |
| Ansible | [ansible.md](/guides/infrastructure/ansible.md) | Configuration management and automation |
| Docker  | [docker.md](/guides/infrastructure/docker.md)   | Containerization and Docker Compose     |

## See Also

* [Process Guides](/guides/process.md) — CI/CD, testing
* [Language Guides](/guides/languages.md) — YAML, Shell

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Source version: 2026.10.4. [Source file](https://github.com/agh/crefft/blob/703c8156f7604b464921c851535242202541cfb3/guides/infrastructure/README.md).