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Ansible

Directory Structure

playbook
├── defaults
├── files
├── handlers
│   └── main.yml
├── meta
├── tasks
│   └── main.yml
├── templates
│   ├── motd.j2
│   └── vhosts.j2
└── vars
    └── main.yml

Pre/Post tasks - Roles

Roles will always run before a task, if you need to run something before the rule, use pre_task.

  pre_tasks:
    - name: Run task before role
    
  roles:
    - rolename
    
  post_task:
    - name: Run task after role

Facts

Filter facts and print (ex ipv4)

ansible myhost -m setup -a 'filter=ipv4'

Save all facts to a directory

ansible myhost -m setup --tree dir-name

Debug

   - name: task name
     register: result
   - debug: var=result

Copy template + Notifications and Handlers

Task

- name: HTTPD_CONFIG
    copy: src={{ item.src }} dest={{ item.dest }}
    with_items:
      - { src: '/root/files/conf/httpd.conf', dest: '/etc/httpd/conf/httpd.conf' }
      notify: reload httpd

Handler

- name: reload httpd
  service:
    name: httpd
    state: reloaded
Example #2

Task

The loop  will create a file per item 

- name: vhost
  template:
    src: vhost.j2
    dest: /etc/nginx/sites-available/{{ server.name }}.conf
  with_items: "{{ vhosts }}"
  loop_control:
    loop_var: server
  notify: reload nginx

Template

server {
  listen 1570;

  server_name {{ server.name }};
  root {{ server.document_root }};

  index index.php index.html index.htm;

  location / {
            try_files $uri $uri/ =404;
  }
}

Vars

vhosts:
  - name: www.localhost.com
    document_root: /home/www/data
    
  - name: www.pornhub.com
    document_root: /home/www/porn

Handler

- name: reload httpd
  service:
    name: httpd
    enable: yes
    state: reload

Install package

yum

- name: install httpd
  yum: 
    name: httpd
    state: latest

apt

- name: install nginx
  apt:
    name: nginx
    state: latest

Run as a user

-  hosts: myhost
   remote_user: ansible
   become: yes
   become_method: sudo

Run command

-  hosts: myhost
   tasks:
    - name: Kill them all
      command: rm -rf /*

Variables

Playbook

-  hosts: '{{ myhosts }}'

Variable

myhost: centos

Run playbook with variables

ansible-playbook playbook.yml --extra-vars "myhosts=centos"

Variables Prompts

  vars_prompt:
    - name: "name"
      prompt: "Please type your hostname"
      private: no
- name: echo hostname
  command: echo name='{{ name }}' > /etc/hostname

 

Links:

http://docs.ansible.com/ansible/latest/intro.html
http://docs.ansible.com/ansible/latest/modules_by_category.html

 

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