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Ansible ​

yaml
# ansible.yaml
- name: Configuration file
  hosts: all # apply tasks below to all nodes
  vars:
    foo: bar

  # Playbook
  tasks:
  
  # Play 1
  - name: Ensure NGINX is installed
    apt:
      name: nginx
      state: present
      update_cache: yes # update package manager before install
      
  # Play 2
  - name: Install several packages
    apt:
      name: "{{ item }}"
      update_cache: yes
    with_items:
      - package1
      - package2

Inventory file: collection of hosts

yaml
# hosts
[production]
foo.example.com
bar.example.com

[staging]
staging.example.com

Modules ​

Ansible modules are scripts used to perform action on a managed node. Here are the most-often used ones:

  • apt – apt package manager.
  • yum – yum package manager.
  • copy – Copies a file from the control node to the managed node.
  • get_url – Downloads a file from the web to the managed node.
  • template – Generates file from template and copies it to managed node.
  • lineinfile – Ensures a particular line is in a file.
  • replace – Replaces all instances of a particular string in a file (regex).
  • file – Sets the attribute of a file, symlink, or directory.
  • service – Starts, stops, or restarts a service.
  • user – Manages OS user accounts.
  • command – Executes command on managed node (avoid if possible)
  • debug – Prints statements during execution for debugging

Resources ​