umich-arc / ansible_demo Goto Github PK

• About
• Branch Names:
  • 00/cleanStart
  • 01/basicPlaybook
  • 02/shellAndDebugTasks
  • 03/shellTaskNoChange
  • 04/copyFile
  • 05/copyFileWithItems
  • 06/copyFileWithItemsAdv
  • 07/templatesAndVars
  • 08/groupAndHostVarsLayout
  • 09/hostVarsOverwirte
  • 10/roles
  • 11/rolesTemplatesVSCopy
  • 12/rolesTemplatesJinja2Syntax
  • 13/tags

This repo is meant to be used as part of a presentation to introduction people to Ansible. Each branch represent a lesson, and the presenter should iterate through each branch describing each Ansible concept. A minimum of 2 Linux systems is required for demonstrating concepts. Talking points and links to documentation are provided in for each branch.

Clean install directory layout.

• Look at the ansible.cfg file. The file is well documented but you can get more details at the Ansible Configuration file link
• Take a look at the hosts file. This is where you can define your inventory, some examples are provided. For more details see the Ansible Inventory documentation

Populate the inventory file and simple playbook.

• Inventory, demonstrating the concept of groups, group of groups, and aliases. Read more Ansible Inventory documentation
• Simple playbook that will check to make sure it can talk to each host via ssh. Read:
  • Playbooks
  • hosts
  • tasks
  • ping module
  • Executing a Playbook

Use shell module, how to register(store) output from the shell command into a variable, and use debug module to print the values to the screen.

• Run a shell command to gather disk usage and store results in a variable. Read:
  • shell module
  • register
• Use the debug module to print out the variable contents in two different ways.
  • debug module

Shell commands will always report a change even if you are just doing a directory listing. Behavior can be overwritten with changed_when property.

• overriding the changed result

Playbook to copy a file demonstrating rename from src to dest and backup options.

• copy module

Copy more than one file in a task, demonstrating the with_items feature of Ansible

• standard loop

A continuation of standard loops (with_items) using list of hashes.

• standard loops

Concept of group and host variables in reference to the inventory, and how to use the template module to render templates as files on destination system.

• host variables
• group variables
• template module

Group/Host variables organizational layouts options.

• splitting out host and group specific data

Variable overwrite concept and Variable precedence

• variable precedence

Ansible roles and structure, demonstrating a role with 3 tasks

• roles

Choosing template over copy and how comment filter in templates makes it a better choice over copy

• template comment filters

JINJA2 syntax in combination with group_vars, demonstrating for loop and if conditional

• jinja: for
• jinja: if
• Group_vars/all:
  • default/common
  • variable example

Run specific parts of a playbook with tags.

• tags