Ansible
Introduction
why ansible ?
1980s - Personal computers
1960s - mainframes
1980s - Client Server
1990s - web enterprises
2000s -Cloud
devOPS
Manual
Scripts
IaaC
remote management
-
func - pssh
- cluster-ssh
- parallel-ssh
CONFIGURATIOn management
Deployments and orchestration
capistrano
fabric
provisioning tools
cloud formation
heat
terraform
configuration management
provisioniong
deployment and orchestration
ad hoc server management
ansible
5 FEATURES
-
Simplicity -
Batteries Included -
Infrastructure as a Code -
Code vs Data -
Idempotence
simplicity
-
SIMPLE TO LEARN
-
SIMPLE to setup
Simple Things should be simple, complex things should be possible
- Alan Kay
YAML
---
- hosts: all
remote_user: vagrant
sudo: yes
tasks:
- name: create devops user with admin previleges
user: >
name=xyz
uid=2001
group=pqr
password=er867!fe%rger93$#c
agent less
push model
-
Uses SSH / WinRM -
Simple to Setup -
Smaller Footprint
-
Secure
push
pull
vs
Agent
Agent
Agent
450+
Modules
batteries included
batteries included
systems
cloud
containers
monitoring tools
collaboration tools
network
source control
21
catagories
Infrastructure as a Code
---
- hosts: all
remote_user: vagrant
sudo: yes
tasks:
- name: create devops user with admin previleges
user: >
name=xyz
uid=2001
group=pqr
password=er867!fe%rger93$#c
SCRIPTS | ANSIBLE
python
perl
shell
HOW
what
user
name = xyz
shell = /bin/bash
uid = 5001
group = xyz
password = w&*Tnkj23sa
version control
Editing and Refactoring Tools
Peer Reviews
TDD
code
data
vs
port = 80 user = apache conn = 1024
port = 8080 user = www-data conn = 512
port = 9000 user = httpd conn = 4096
profile 1
profile 2
profile 3
port = 80 user = apache conn = 1024
code
data
vars
tasks
templates
port = {{ port }} user = {{ user }} conn = {{ conn }}
roles
generic
sharable
idempotencE
ƒ ( ƒ ( x ) ) = ƒ (x )
idempotencE
ƒ ( ƒ ( x ) ) = ƒ (x )
Idempotence is the property of certain operations in mathematics and computer science, that can be applied multiple times without changing the result beyond the initial application.
Which can be simply represented by,
Lets simplify that a bit.....
First time I read that, I had the same expressions !!
Goa
Bangalore
chennai
Mumbai
1
2
3
how is it relevant to ansible ?
-
Ansible runs are invoked multiple times
-
Every time, it compares the desired state vs current state. And the decides whether to take an action, or to skip.
desired
desired
current
current
task 1
task 2
task 3
task 4
task 5
task 6
task 7
task 8
task 1
task 2
task 3
task 4
task 5
task 6
task 7
task 8
task 1
task 2
task 3
task 4
task 5
task 6
task 7
task 8
1st Run
2nd Run
3rd Run
THE STORY
2012
Michael dehaan
2006 - Emerging Technologies Group, RedHat
Cobbler
Func
Product Manager, Puppet Labs
Ansible
ansible inc
Ansible Works => Ansible Inc
2013
- Said Ziouani
- Michael DeHaan
- Tim Gerla
ansible ?
Ansible(noun): a fictional machine capable of communicating faster than the speed of light.
Coined by Ursula K. Le Guin in her 1966 novel Rocannon's World
RedHat
2015
src: http://www.businesswire.com/news/home/20151016005177/en
2014
2016
Releases
Led Zeppelin songs
Van Halen songs
Ansible Introduction