Ansible

Ansible is an open-source automation tool for configuring systems, deploying applications and running repeatable tasks. You write playbooks in YAML that list the desired state of a server, and Ansible connects over SSH, with no agent installed on the target, to bring each machine to that state.

Why it matters

Ansible lets one operator manage dozens or hundreds of servers consistently: install packages, template configuration files, restart services, rotate users. Its modules are designed to be idempotent, meaning a second run changes nothing if the system already matches. That makes it safe to re-run and useful for configuration management and for provisioning steps after a server is created.

Example

- hosts: web
  become: true
  tasks:
    - name: Install nginx
      ansible.builtin.package:
        name: nginx
        state: present
    - name: Ensure nginx is running
      ansible.builtin.service:
        name: nginx
        state: started
        enabled: true

Run with ansible-playbook -i inventory.ini site.yml.

Common mistakes

• Using raw shell or command tasks that are not idempotent when a module exists.
• Putting passwords in plain text instead of using Ansible Vault.
• Not testing playbooks against a staging host first.

Related

• Configuration management
• Idempotent
• SSH
• YAML

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