Warsztaty ansible

Wiktor Kołodziej

Automatyzacja z Ansiblemczyli jak zrobić żeby zrobić i się nie narobić

Grzegorz Nosek

„the three great virtues

of a programmer:

lazinessimpatiencehubris

— Larry Wall

laziness

http://www.flickr.com

/pho

tos/snakph

otograph

y/5004775320

Load balancer

App server App server

Database server

nginx

flask/gunicorn

postgresql

deployment

configurationmanagementfabric

capistrano

puppetchef

ansible

ansible

vpn

provision

config db

repo

template

vm

instance

ca

http://www.flickr.com/photos/dullhunk/6827669146

66playbooks

232templates

85Kof yaml

pip install ansible

TADA.*

*modules may have extra dependencies

faster and light

ansible

python 2.6+ansible

target host

sshdpython 2.6+module deps

2.5.x + simplejsonif you really have to

ssh

use keys tokeep you sane

inventory

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

inventory

localhost

[some_group]host1.example.comhost2 ansible_ssh_host=10.2.3.4host3 any_key=any_value

hello, world!

ansible localhost -m pinglocalhost | success >> { "changed": false, "ping": "pong"}

hello, world!

ansible localhost -m file \ -a "path=/etc/ansible state=directory"

host pattern

module name

module args

basic modules

apt/yum/…file/copy/templatecommand/shell/scriptservice

http://www.ansibleworks.com/docs/modules.html

136 default modulesand counting

facts

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

playbooks

---- hosts: localhost vars: - greeting: Hello tasks: - command: echo "{{greeting}}, {{inventory_hostname}}"

ansible-playbook hello.yml

playbooks

---- hosts: localhost vars: - greeting: Hello tasks: - command: echo "{{greeting}}, {{inventory_hostname}}"

ansible-playbook hello.yml

gather_facts: true

variables

facts

idempotence

f(f(x)) = f(x)

idempotence

---- hosts: localhost tasks: - template: src=... dest=... notify: restart mysql

handlers: - name: restart mysql service: name=mysql state=restarted

idempotence

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

idempotence

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

http://www.flickr.com/photos/botheredbybees/353571858

gotcha!

yaml 101

---- hosts: localhost user: "{{some_variable}}" tasks: - debug: msg="hello, {{item}}" with_items: - ansible - world - debug: msg="another task"

- list item

dict key: value

"quotes sometimesmandatory"

yaml 101

---[{ "hosts": "localhost", "user": "{{some_variable}}", "tasks": [{ "debug": "msg=hello, {{item}}", "with_items": ["ansible", "world"] }, { "debug": "msg=another task" }]}]

yaml is a json superset(rly!)

questions so far?

Let's rock!http://bit.ly/ansible-warsztaty