Ansible Crash Course
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This document provides an overview of Ansible, an open source tool for configuration management and application deployment. It discusses how Ansible works using simple YAML playbooks to define configurations and execute tasks across nodes in an automated and agentless manner. The document also covers key Ansible concepts like modules, inventory, roles, conditionals and loops. It provides instructions on installing Ansible via pip, yum or apt and highlights many of Ansible's core modules.
![Inventory
•
List of your hosts
•
•
Grouped together
Example hosts file:
/etc/ansible/hosts"
!
[webservers]"
foo.example.com"
bar.example.com"
!
[dbservers]"
one.example.com"
two.example.com"
!
[california]"
foo.example.com"
one.example.com
Peter Sankauskas
@pas256
AnswersForAWS.com
@Answers4AWS](https://image.slidesharecdn.com/codemash-140107125819-phpapp02/85/Ansible-Crash-Course-8-320.jpg)
![.boto file
[Credentials]
aws_access_key_id = AKIABCDEFGHIJKLM
aws_secret_access_key = duhke3pth15aSECr3t0R3153
Peter Sankauskas
@pas256
AnswersForAWS.com
@Answers4AWS](https://image.slidesharecdn.com/codemash-140107125819-phpapp02/85/Ansible-Crash-Course-11-320.jpg)
Ansible Crash Course
- 1. Ansible crash course CodeMash 2014 - PreCompiler Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 2. Ansible is… a radically simple IT orchestration engine that makes your applications and systems easier to deploy • secure by using SSH for connections • has AnsibleWorks as a backing company free, open source, & available on GitHub written in Python • • • • agent-less Peter Sankauskas @pas256 ! AnswersForAWS.com @Answers4AWS
- 3. Installation From Source ! $ $ $ $ sudo pip install paramiko PyYAML jinja2 git clone git://github.com/ansible/ansible.git cd ./ansible source ./hacking/env-setup" Using PIP $ sudo pip install ansible" Using yum $ sudo yum install ansible" Using apt Peter Sankauskas @pas256 $ sudo add-apt-repository ppa:rquillo/ansible $ sudo apt-get update $ sudo apt-get install ansible AnswersForAWS.com @Answers4AWS
- 4. Playbooks • Contains one or more “plays” • Written in YAML • • • Declare configuration YAML is not code Executed in the order it is written • No dependency graph Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 5. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 6. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 7. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 8. Inventory • List of your hosts • • Grouped together Example hosts file: /etc/ansible/hosts" ! [webservers]" foo.example.com" bar.example.com" ! [dbservers]" one.example.com" two.example.com" ! [california]" foo.example.com" one.example.com Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 9. EC2 inventory plugin • AWS has an API which is always up-todate • Generate inventory off that, return JSON • Group instances by: • • security groups • tags • keypairs • • region and availability zone more… Uses boto Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 10. boto • Python library for AWS • Written by Mitch Garnaat who was then hired by Amazon • • He also writes the new AWS CLI Multiple ways to supply it with AWS credentials • Environment variables • IAM Role • .boto file Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 11. .boto file [Credentials] aws_access_key_id = AKIABCDEFGHIJKLM aws_secret_access_key = duhke3pth15aSECr3t0R3153 Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 12. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 13. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 14. Install AWS command line tool ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" Documentation tasks:" - name: Install Python PIP" apt: pkg=python-pip state=latest" ! Module - name: Install AWS CLI" Arguments pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 17. Module Documentation http://www.ansibleworks.com/docs/modules.html • Bookmark • Star • Tweet • Take photo • Write down now Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 18. Most used modules • apt • • • Add/Remove packages file • command • Execute any shell command • service • • copy • • Copy a file from source to destination on host Peter Sankauskas @pas256 Create directories, symlinks, change permissions Start/Stop/Enable services template • Copy, but with variable substitution in file AnswersForAWS.com @Answers4AWS
- 19. Modules • All modules are part of core • No competing modules • No abandoned modules • All core modules are written in Python • You can write custom modules in any language • There is already helper code in Ruby https://github.com/ansible/ ansible-for-rubyists Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 20. DRY • Includes • • Reuse lists of task Roles • Reuse a set of tasks, files, variables and templates Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 21. Includes ---" - name: Install AWS CLI" user: ubuntu" sudo: True" hosts: all" tasks:" - include: install-aws-cli.yml" ! ! install-aws-cli.yml! - name: Install Python PIP" apt: pkg=python-pip state=latest" ! - name: Install AWS CLI" pip: name=awscli state=latest Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 22. Roles ---" - name: Set up web boxes" user: ubuntu" sudo: True" hosts: webservers" roles:" - base" - webserver" ! ! ! ! ! ! ! ! ! Peter Sankauskas @pas256 webservers.yml" dbservers.yml" roles/" base/" files/" templates/" tasks/" handlers/" vars/" meta/" webservers/" files/" templates/" tasks/" handlers/" vars/" meta/ AnswersForAWS.com @Answers4AWS
- 23. Conditions & Loops ---" # Install everyone's favorite editors" ! - name: Install editor packages (apt)" apt: pkg={{ item }} state=latest" with_items:" - emacs23-nox" - emacs23-el" - vim" when: ansible_distribution == 'Ubuntu'" ! ! - name: Install editors packages (yum)" yum: pkg={{ item }} state=latest" with_items:" - emacs" - emacs-el" - vim-enhanced" when: ansible_distribution == 'Amazon' Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS
- 24. Thanks • Want more examples, check out the NetflixOSS Ansible Playbooks • http://answersforaws.com/code/netflixoss/ Peter Sankauskas @pas256 AnswersForAWS.com @Answers4AWS