# Intro to Ansible  --- # Agenda * What is Ansible? * Installing and using Ansible * Live Demo * Use cases in GiG * Q&A --- # What is Ansible? ---- An open source configuration management tool. Ansible is able to easily manage the state of configuration of the infrastructure hosting our applications. ---- Ansible uses "Playbooks" as step by step instructions for the host to follow. These playbooks are built with idempotency in mind, meaning whether we run them 1 or 1000 times, the end state of our servers always ends up the same. ---- Playbooks are essentially a piece of code we can commit to VCS; This is thinking of infrastructure as code, and allows us to automate building, destroying and rebuilding of our application servers with consistency and limited human error. --- ## Technical details * Agentless<!-- .element: class="fragment" data-fragment-index="1" --> * Written in Python<!-- .element: class="fragment" data-fragment-index="2" --> * Jinja Templates!<!-- .element: class="fragment" data-fragment-index="3" --> * Uses YAML or INI format<!-- .element: class="fragment" data-fragment-index="4" --> * Uses SSH or other implementations of it such as Paramiko<!-- .element: class="fragment" data-fragment-index="5" --> --- ## How does it work? 1. Ansible Connects to host via SSH<!-- .element: class="fragment" data-fragment-index="1" --> 2. Uploads ansible modules (written in Python)<!-- .element: class="fragment" data-fragment-index="2" --> 3. Executes said modules on the host.<!-- .element: class="fragment" data-fragment-index="3" --> 4. After all is said and done, the modules on the host are deleted.<!-- .element: class="fragment" data-fragment-index="4" --> --- ### Pros * Easy to learn and to get started<!-- .element: class="fragment" data-fragment-index="1" --> * [Batteries included](https://docs.ansible.com/ansible/latest/modules/list_of_all_modules.html)<!-- .element: class="fragment" data-fragment-index="1" --> * Extensible<!-- .element: class="fragment" data-fragment-index="1" --> * Reliable <!-- .element: class="fragment" data-fragment-index="1" --> * Great documentation and supporting community<!-- .element: class="fragment" data-fragment-index="1" --> ---- ### Cons * Slow AF :turtle:<!-- .element: class="fragment" data-fragment-index="1" --> * Doesn’t fail fast if there are config errors<!-- .element: class="fragment" data-fragment-index="1" --> * Requires stable SSH connection <!-- .element: class="fragment" data-fragment-index="1" --> --- # Installing ansible `apt-get ansible` `yum -y install ansible` `pacman -s ansible` `brew install ansible` `# whatever windows users have to do` --- # Using Ansible ## Inventory File ``` # staging_hosts example [webservers] staging.comply.gig.com [workers] staging-worker.comply.gig.com staging-worker-02.comply.gig.com staging-worker-03.comply.gig.com [celery_match_images] staging-worker-image.comply.gig.com ``` --- # Using Ansible ## Playbooks ``` # playbook1.yml --- - hosts: webservers tasks: - name: Say Hello debug: msg: "Hello, World!" ``` --- # Live Demo --- # Resources * https://docs.ansible.com/ * https://www.ansiblefordevops.com/ * https://github.com/sk1u/ansible_demo * https://rebelpenguin.atlassian.net/wiki/spaces/DEV/pages/636616705/Ansible+Best+Practices * https://rebelpenguin.atlassian.net/wiki/spaces/AC/pages/463962113/Ansible ---  --- # Q&A