4.8 Automation & infrastructure as code

14 entries

• 0181 Ansible concepts: inventory, modules, playbooks, idempotency and roles Ansible configures many servers over SSH from one control machine. Learn the core pieces: inventory, modules, tasks, playbooks, roles, and why runs… Beginner · Concept · Linux, macOS Article Ansible 15 Oct 2026
• 0182 Your first Ansible playbook: install nginx and publish a page A complete beginner playbook that installs nginx on Debian or Ubuntu servers, starts it at boot and deploys a home page, with… Beginner · How-to · Linux, macOS Script Ansible 15 Oct 2026
• 0183 Ansible variables, templates and handlers: configure an nginx site Use group variables, Jinja2 templates and handlers together: render an nginx server block from variables, test the config and reload nginx only… Intermediate · How-to · Linux, macOS Script Ansible 15 Oct 2026
• 0184 Ansible Vault: keep passwords and keys encrypted in your repo Ansible Vault encrypts variable files or single values so secrets can live in Git next to your playbooks. Create, edit and rekey… Advanced · How-to · Linux, macOS Article Ansible 15 Oct 2026
• 0185 Ansible ad-hoc commands cheat sheet One-line ansible commands for quick jobs across many servers: ping hosts, run a command, copy files, manage packages, users and services, gather… Intermediate · Reference · Linux, macOS Article Ansible 15 Oct 2026
• 0186 Fix: Ansible UNREACHABLE! Failed to connect to the host via ssh Ansible could not open an SSH session to the host, so no task ran. The text after the colon tells you why:… Intermediate · Fix · Linux, macOS Article Ansible · SSH & servers 15 Oct 2026
• 0187 Terraform concepts: providers, state, plan and apply, modules, and OpenTofu Terraform describes infrastructure in code, compares it with what exists, and changes only the difference. Learn providers, resources, state, the plan/apply loop,… Beginner · Concept · Any system Article Terraform 15 Oct 2026
• 0188 First Terraform configuration: variables, a module and outputs (no cloud needed) A complete Terraform project that writes local files with the hashicorp/local provider, so you can practice init, plan, apply, modules and destroy… Intermediate · How-to · Any system Script Terraform 15 Oct 2026
• 0189 Terraform remote state: backends, locking and migrating local state Move Terraform state from a local file into a shared backend such as S3 with locking, so a team can work safely.… Advanced · How-to · Any system Article Terraform 15 Oct 2026
• 0190 Fix: Terraform Error acquiring the state lock Another run holds the lock on your Terraform state, or a crashed run left it behind. Find out who holds it, wait… Advanced · Fix · Any system Article Terraform 15 Oct 2026
• 0194 Ansible: agentless IT automation The source repository of ansible-core, the engine behind Ansible playbooks, ad-hoc commands and the ansible-galaxy and ansible-vault tools. Linux, macOS Repo Ansible 15 Oct 2026
• 0195 OpenTofu: open-source infrastructure as code OpenTofu is the community fork of Terraform under the MPL-2.0 license, run as a Linux Foundation project. It uses the same configuration… Any system Repo Terraform 15 Oct 2026
• 0254 Automate three servers with Ansible: roles, templates, Vault and safe dry runs Build a real Ansible project for two web servers and one database server: inventory groups, SSH keys, roles, templates, handlers, an encrypted… Intermediate · Tutorial · Linux, macOS Article Ansible · Keys & config 15 Oct 2026
• 0256 Manage infrastructure as code with Terraform: from first file to plans on pull requests Learn the full Terraform workflow without a cloud account: variables, a module, outputs, state, plan, apply and destroy, a backend for shared… Beginner · Tutorial · Linux, macOS, Windows Article GitHub Actions · Terraform 15 Oct 2026