This document discusses using Ansible for automation and configuration management. It introduces key Ansible concepts like playbooks, modules, facts, idempotence and YAML syntax. Ansible allows defining infrastructure as code using playbooks to configure systems in a consistent, repeatable way. Playbooks can run tasks across multiple servers simultaneously using SSH to manage configurations without installing agents on remote systems.

1. Automatyzacja z Ansiblem
czyli jak zrobić żeby zrobić i się nie narobić
Grzegorz Nosek
Wiktor Kołodziej

2. „
the three great virtues
of a programmer:
laziness
impatience
hubris
— Larry Wall

3. laziness
http://www.flickr.com/photos/snakphotography/5004775320

4. Load balancer
App server
App server
Database server
nginx
flask/gunicorn
postgresql

5. puppet
chef
deployment
fabric
capistrano
ansible
configuration
management

6. 66
vm
instance
ca
playbooks
template
ansible
repo
232
templates
vpn
config db
provision
http://www.flickr.com/photos/dullhunk/6827669146
85K
of yaml

7. pip install ansible
TADA.
*
*
modules may have extra dependencies

8. faster and light
ansible
ssh
python 2.6+
ansible
2.5.x + sim
plejson
if you reall
y have to
use keys to
keep you san
e
target host
sshd
python 2.6+
module deps

9. inventory
/etc/ansible/hosts
-i <path-to-inventory>
ANSIBLE_HOSTS=<path-to-inv>

10. inventory
localhost
[some_group]
host1.example.com
host2 ansible_ssh_host=10.2.3.4
host3 any_key=any_value

11. hello, world!
ansible localhost -m ping
localhost | success >> {
"changed": false,
"ping": "pong"
}

12. hello, world!
at tern
h os t p
odule name
m
ansible localhost -m file
-a "path=/etc/ansible state=directory"
module args

13. basic modules
apt/yum/…
file/copy/template
command/shell/script
service

14. 136 default modules
and counting
http://www.ansibleworks.com/docs/modules.html

15. facts
ansible localhost -m setup
localhost | success >> {
"ansible_facts": {
"ansible_all_ipv4_addresses": [
"172.16.0.150",
"192.168.1.132",
...
],
...
}

16. playbooks
--- hosts: localhost
vars:
- greeting: Hello
tasks:
- command: echo "{{greeting}},
{{inventory_hostname}}"
ansible-playbook hello.yml

17. playbooks
s: t rue
r_fact
gathe
--- hosts: localhost
vars:
bles
facts
varia
- greeting: Hello
tasks:
- command: echo "{{greeting}},
{{inventory_hostname}}"
ansible-playbook hello.yml

18. idempotence
f(f(x)) = f(x)

19. idempotence
--- hosts: localhost
tasks:
- template: src=... dest=...
notify: restart mysql
handlers:
- name: restart mysql
service: name=mysql state=restarted

20. idempotence
--- hosts: localhost
tasks:
- template: src=... dest=...
register: mysql_conf
- service: name=mysql state=restarted
when: mysql_conf.changed

21. idempotence
--- hosts: localhost
tasks:
- command: touch /foo creates=/foo
- command: rm /bar removes=/bar

22. t
o
g
http://www.flickr.com/photos/botheredbybees/353571858
!
a
h
c

23. yaml 101
dict key: value
- list item
--"quotes somet imes
- hosts: localhost
user: "{{some_variable}}"
mandatory"
tasks:
- debug: msg="hello, {{item}}"
with_items:
- ansible
- world
- debug: msg="another task"

24. yaml 101
yaml is a json superset
(rly!)
--[{
"hosts": "localhost",
"user": "{{some_variable}}",
"tasks": [{
"debug": "msg=hello, {{item}}",
"with_items": ["ansible", "world"]
},
{ "debug": "msg=another task" }]
}]

25. questions so far?
Let's rock!
http://bit.ly/ansible-warsztaty