ansible
Automate configuration management and application deployment with Ansible. Use when tasks mention ansible-playbook, inventory files, Ansible roles, ad-hoc commands, ansible-galaxy, or agentless SSH automation.
What this skill does
# Ansible ## Intent Router | Request | Reference | Load When | | --- | --- | --- | | Install tool, SSH setup, ansible.cfg | `resources/install-and-setup.md` | User needs to install Ansible or configure control node | | Inventory files, group_vars, host_vars | `resources/inventory-and-variables.md` | User needs inventory structure or variable precedence | | Playbook authoring, roles, modules | `resources/playbook-patterns.md` | User needs play structure, task patterns, or common modules | | CLI commands, vault, galaxy | `resources/command-cookbook.md` | User needs ansible/ansible-playbook/ansible-vault/galaxy commands | ## Quick Start ```bash # 1. Define your inventory cat > inventory.ini <<'EOF' [web] web1.example.com web2.example.com [db] db1.example.com EOF # 2. Test connectivity (ad-hoc ping) ansible all -i inventory.ini -m ping # 3. Run a playbook ansible-playbook -i inventory.ini site.yml # 4. Dry-run a playbook (check mode — no changes) ansible-playbook -i inventory.ini site.yml --check --diff ``` ## Core Concepts | Concept | Description | | --- | --- | | **Control node** | Machine where Ansible runs (requires Python; no agent needed on targets) | | **Managed node** | Target host reached via SSH (Linux) or WinRM (Windows) | | **Inventory** | List of managed nodes (INI, YAML, or dynamic script) | | **Playbook** | YAML file defining ordered plays and tasks | | **Role** | Reusable directory structure (tasks, handlers, templates, vars) | | **Module** | Idempotent unit of work (copy, service, package, user, command…) | | **Collection** | Packaged set of roles, modules, and plugins from Ansible Galaxy | ## Safety Guardrails - Always run with `--check --diff` first to preview changes without applying them. - Use `--limit` to target a subset of hosts before running against all inventory. - Avoid `command` and `shell` modules when an idempotent module exists. - Running as root (`become: true`) requires explicit approval — confirm privilege escalation scope. - Protect secrets with `ansible-vault encrypt` — never commit plaintext passwords. ```bash # Install a role then dry-run the playbook to preview changes ansible-galaxy role install geerlingguy.java ansible-playbook -i inventory.ini site.yml --check --diff ``` ## Workflow 1. Define or update inventory. 2. Test connectivity: `ansible all -m ping -i inventory.ini` 3. Write or update playbook. 4. Dry-run: `ansible-playbook site.yml -i inventory.ini --check --diff` 5. Run against a subset: `ansible-playbook site.yml -i inventory.ini --limit web1.example.com` 6. Run against all: `ansible-playbook site.yml -i inventory.ini` ## Related Skills - **terraform** — provision infrastructure; Ansible configures after provisioning - **pulumi** — IaC with code; Ansible handles post-provision configuration ## References - `resources/install-and-setup.md` - `resources/inventory-and-variables.md` - `resources/playbook-patterns.md` - `resources/command-cookbook.md` - Official docs: <https://docs.ansible.com/ansible/latest/> - Galaxy: <https://galaxy.ansible.com> - Jeff Geerling's book/repo: <https://www.ansiblefordevops.com/> - Red Hat learning: <https://www.redhat.com/en/topics/automation/learning-ansible>
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