introduction to ansible

Introduction To Ansible

Kasun Madura Rathnayaka.Senior Sys/Devops Engineer

BSc (Hons) Electrical and Information, Engineering AWS Certified Solutions Architect Associate AMIE(SL),CCIP,RHCE,RHCSA,[email protected] skype:kasunmadura141

mailto:[email protected]

Continuous Integration

Teams integrate their work multiple times per day.

Each integration is verified by an automated build

Significantly reduces integration problems

Develop cohesive software more rapidly

Source: Martin Fowler

Continuous Integration

Continuous Integration and Automation Tools

●CI Tools

○ Jenkins ,Teamcity ,Buildbot, Bamboo

●Automation Tools

○ Puppet,Chef,Ansible

●Version Control

○ svn,git,perforce

●Build Tool

○ Maven,ant,grant

● Code quality inspection tool

○ Sonar,Sonarqube

Ansible

What is Anible ?

Why we need Ansible ?

Advantage and Disadvantages..

Compare with Puppet and Chef

What is Ansible

● “radically simple IT automation platform”

●Describe the intended system state using playbooks written in YAML

●Requires no agent on the managed machine, only a Python interpreter and an

SSH server

Shell Script● #!/bin/bash

● echo "fs.file-max=20000" | sudo tee -a /etc/sysclt.conf

● sudo apt-get -y install build-essential

● sudo mkdir -p /var/www/kasun

● sudo apt-get -y install apache2

● sudo a2enmod rewrite

● sudo tee /etc/apache2/sites-available/mysite <<ENDOFFILE

● <VirtualHost *:80>

● DocumentRoot "/var/www/kasun/"

● ServerName www.kasun.com

● # Other directives here

● </VirtualHost>

● ENDOFFILE

Ad-hoc configurationConfiguration file /etc/ansible/ansible.cfg

1st ansible command :)

$ cat >hosts [webservers] 192.168.1.40 ^D

$ ansible -vvv all -i hosts -u root -m ping

$ ansible -vvv webserver -i hosts -u root -m apt -a 'name=cowsay state=present'

$ ssh 192.169.1.40 cowsay moo

Playbooks

Consolidate tasks and configuration knobs into a single YAML file

Support templating—both in playbooks and in file templates—by way of Jinja2

Can be one file, or split up into many roles (more later!)

Running a playbook

• ansible-playbook playbook.yml

• -i to specify a local inventory file (e.g. hosts)

• -k if you have to enter a password for this run

• Use authorized_key to install an SSH key for future runs

Real Example

Get the ball rolling :)

Discussion

Quiz