Ansible Wechat Account Ansible Meetup Shanghai August 17th - PowerPoint PPT Presentation

Ansible Wechat Account

Ansible Meetup Shanghai August 17th

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Introduction

What is Ansible? • Ansible.com • Gaining momentum • Ansible on GitHub • Very fast learning curve • Python based • Easy to get started • Easy to extend • Agent-less

Similar Tools • salt-stack: python based, server / agent (minions) • puppet: ruby based, server/agent - harder • chef: ruby based, server/agent - harder • capistrano: ruby based, more focused toward deployment work fl ow

Install and Configuration Install • either through your package manager, yum / apt-get • or better through pip install ansible for the latest versions Configuration • environment variables • ansible.cfg in current folder, home dir or /etc/ansible Latest version are "preferred" as Ansible evolves very quickly with bug fixes and new features (4 months ago newest release and daily pull request)

Concepts

Ansible Concepts YAML • used everywhere; to list tasks, handlers, variables, etc. • it's the easiest way to have a structured yet reader friendly file structure (e.g. compared to json) Modules • atomic operations • manage idempotence • many are core, lots are community, covers from cloud service (aws), to lineinfile, to file, to ...

Ansible Concepts Playbook • sequential list of operation • collection of tasks, handlers Tasks / Handlers • tasks: has a name, executes a module action, completes with either success / failure / skipped • handlers: "sleeping" tasks that can be invoked by a task upon completion (e.g. when config file change, restart service)

Ansible Concepts Variables • host_vars - host specific variables • group_vars - group specific variables • file vars - external file that can be used to load some variables (syntax -e "@filename.yml" ) • vars registration - one can register variable during the execution of a playbook for future use Inventory • collection of hosts / groups

Tool Belt CLI

Tool Belt Ansible • used to run simple modules • ansible all -i hosts -m ping Ansible-playbook • used to execute a playbook • ansible-playbook -i hosts playbook.yml

Tool Belt Ansible-vault • used to access and load secrets Ansible-galaxy • used to search, fetch roles • ansible-galaxy install user.roles fetch and install a role globally (in `/etc/ansible/roles`) • ansible-galaxy install -r roles.txt -p roles fetch and install roles defined in roles.txt file (similar to requirements.txt ) and save in roles folder

Roles / Galaxy • Community driven collection of roles at http:// galaxy.ansible.com • Roles are collection of tasks / handlers used to tackle larger set of tasks - e.g. setup, install, configure nginx and the vhosts

Questions?

Live Demo

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