Ansible Basics

ansible all -m ping # test connectivity
ansible-playbook playbook.yml # run playbook
ansible-playbook playbook.yml --check # dry run
ansible-playbook playbook.yml --syntax-check # check syntax

# hosts.ini
[webservers]
web1.example.com
web2.example.com

[databases]
db1.example.com

[all:vars]
ansible_user=ubuntu

---
- name: Configure web servers
  hosts: webservers
  become: yes
  
  tasks:
    - name: Install nginx
      apt:
        name: nginx
        state: present

# Copy file
- copy:
    src: /local/file.txt
    dest: /remote/file.txt

# Execute command
- command: ls -la

# Install package
- apt:
    name: nginx
    state: present

# Define variables
vars:
  http_port: 80
  app_name: myapp

# Use variables
port: {{ http_port }}