Ansible

CM history

Key aspects

Simple interface
Just simple and plain SSH
Simple declarative language (YAML)
Team sync simply through VCS
No agent, only python required
Push model completely integrated
No remote install
Modules providing functionality
UN*X, ... for the time being

Architectures

Push

Pull

Basic usage

Install

 pip install ansible

Inventory

[webservers]
web01.domain.com
web02.domain.com
web03.domain.com
[database]
db01.domain.com
db02.domain.com
[production]
web01.domain.com
web02.domain.com
db01.domain.com
[staging]
web03.domain.com
db02.domain.com

Commands

ping

$ ansible web01.domain.com -m ping
web01.domain.com | success >> {
    "changed": false,
    "ping": "pong"
}

setup

 $ ansible web01.domain.com -m setup
web01.domain.com | success >> {
    "ansible_facts": {
        "ansible_all_ipv4_addresses": [
            "172.31.13.7"
        ],
...
        "ansible_virtualization_role": "guest",
        "ansible_virtualization_type": "xen"
    },
    "changed": false
}

PLAYBOOKS

ansible-playbook example.yml

Sections in a playbook

Target: How and where to run playbook

- hosts: webservers
  user: root

Variable: Variables available to the running playbook

  vars:
    domain: www.example.com

Task: Execution list of modules to use

  tasks:
    - name: Install latest nginx
      apt: name=nginx state=latest
    - name: Configure nginx
      template: src=nginx/default.j2 dest=/etc/nginx/sites-available/default
      notify: restart nginx

SECTIONS IN A PLAYBOOK

Handlers: Modularize tasks

  tasks:
  - name: Configure nginx
    template: name=default.j2 dest=
  handlers:
  - name: restart nginx
    service: name=nginx state=restarted

Loops and conditionals

  tasks:
  - name: Install required packages
    apt: {{ item }}
    with_items:
      - nginx
      - mysql-server
    when: ansible_os_family == 'Debian'

Interesting resources

EC2 and Eucalyptus orchestration

http://www.slideshare.net/eucalyptus/ansible-eucalyptuswebinar

Ansible at scale
http://www.slideshare.net/JesseKeating/ansiblefest-rax

OSXC - Boxen-like provisioning
http://osxc.github.io/

How edX uses Ansible

https://speakerdeck.com/jarv/how-edx-uses-ansible

Windows is coming

http://www.ansible.com/blog/windows-is-coming

Links

Ansible

http://www.ansible.com/home

Ansible Weekly
https://devopsu.com/newsletters/ansible-weekly-newsletter.html
Ansible Configuration Management

http://www.amazon.es/Ansible-Configuration-Management-Daniel-Hall/dp/1783280816
Ansible for DevOps

https://leanpub.com/ansible-for-devops

Ansible Galaxy

https://galaxy.ansible.com/

Questions?

http://slides.com/ignasifoschalonso/ansible#/

@ifosch

http://www.entredevyops.es