an introduction to terraform

An introduction to Terraform

Julien Pivotto (@roidelapluie)

RMLL, Saint-Étienne

July 4th, 2017

whoamiJulien Pivotto

@roidelapluie

Sysadmin at inuits

Automation, monitoring, HA

RMLL 2013 org team

inuits

Building infrastructure

Cloud age

Baremtal: talking to your automation tool(cobbler, foreman)

PaaS: Talking to your infrastructure provider

Cloud: Talking to your cloud provider

Talk = Use the WebUI / API

Challenges of current infraPlanning changes

Executing changes

Working together

Keeping up to date (usable) inventories

DevOps

The DevOps principles: CAMS

(a definition of DevOps)

Culture

Automation

Measurement

Sharing

(Damon Edwards and John Willis, 2010 http://devopsdictionary.com/wiki/CAMS)

AutomationAutomate all the things

Version Control

Continuous Integration and Deployment

Infrastructure as Code

Terraform

TerraformOpen Source

Mozilla Public License 2.0

Created by Hashicorp (vagrant, consul, packer,vault)

Started in 2014

Written in Go

Pluggable

What is terraform?

Terraform original goalTerraform is a tool to Build, Change, and VersionControl your infrastructure.

Building infrastructureTalk to multiple cloud/infrasctucture providers

Ensure creation and consistency

Express in an API-Agnostic DSL

Change infrastructureApply incremental changes

Destroy when needed

Preview changes

Scale easily

Version controlHCL language

State file (don't store it in your git repo)

Terraform concepts

Variables

Terraform takes variables as input

Typed variables

JSON, HCL or CLI

OutputOutput specific text, ip addresses, ...

Console or JSON

Providers

Configuration of a resource provider

e.g.: cloud, dns provider, ...

Often require URL, API Key, ...

Modules

Group of resources

Takes parameters

Returns output

Plan

terraform plan

Creates a plan of changes required

Does nothing to the infra

Apply

terraform apply

Applies a plan, make all the changes

Can make the plan before if needed

Statefile

Current know state of the infra

Stored in file or externally

Locking

Destroy

terraform destroy

Delete all the resources

resources can be "protected" in config

Enough talking!

Demo!

More!https://terraform.io

terraform's cousins: packer, consul, vagrant,vault, ...

Julien Pivottoroidelapluie

roidelapluie@inuits.eu

Inuitshttps://inuits.euinfo@inuits.eu

Contact