Introduction to Ansible workshops

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