Advanced Terraform

20 February 2018

 

Stoyan Stoyanov

 

welt.de

Who are we?

• https://www.welt.de
• 150M Visits per Month and growing
• Fastest newspaper site in Germany

whoami

github.com/stoffs

Structure

• Cross-functional teams
• Every team has its own AWS Account
• You build it, you own it

Tech Jungle

Motivation?

• increase automation awareness 
• reducing complexity

How our infrastructure code evolved

• From bash to Chef
• From private cloud to public cloud
• ​From AWS CloudFormation to HashiCorp Terraform

Workflow

• read docs, code, fmt, plan, apply, (destroy)

The State

• Snapshot of the infrastructure
• Can be local or remote with different backends

The State

The State

• Outputs can be shared between "stacks" via remote states

Complexity

Centralized applying

The wrapper

Plan every hour

DRY

Versioning

Responsibility

Conventions

KISS

• Avoid config management
• user data not enough?
• Use container orchestration for the apps

Do not reinvent the wheel

• If for some reason there is no resource for the job
• local-exec + awscli

Roundup

• With great power comes great responsibility
• Updates hurt sometimes :)