Ansible Getting Started

Install ansible
apt/yum -y install ansible

Creating hosts for inventory
touch hosts (or you can use /etc/ansible/hosts)

Inventory File
cat >> /etc/ansible/hosts

[web]
192.168.0.1
192.168.0.2
192.168.0.3

[db]
192.168.0.4
192.168.0.5
192.168.0.6

[all]
192.168.0.1
192.168.0.2
192.168.0.3
192.168.0.4
192.168.0.5
192.168.0.6

Copy key to every machine
ssh-keygen -t rsa
ssh-copy-id [email protected]

Basic commands
ansible [db] -m ping
ansible [web] -m yum -a "name=httpd state=installed"
ansible [all] -a "apt -y update"

-m = module

Creating playbook
cat >>playbook.yaml

---
- hosts: web
  user: root
  tasks:
   - name: install apache
     apt: pkg=apache2 state=latest

   - name: start apache2
     service: name=apache2 state=started

   - name: start apache2 every bootup
     service: name=apache2 enabled=yes

Running playbook
ansible-playbook playbook.yaml
ansible-playbook -i [web] playbook.yaml