slides.md

title: A short introduction to using Terraform with Ansible to provision Heroku apps author: name: Henry url: https://github.com/simpleweb/be-tribe-terraform-heroku-presentation output: slides.html style: slides.css theme: jdan/cleaver-retro controls: true

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A short introduction to Terraform for Heroku with Ansible

• Why Terraform?
• Why Ansbile?

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A walk through Pitch Perfect

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A walk through Pitch Perfect

Entrypoint

• README.md
• script/provision

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A walk through Pitch Perfect

Ansible

• infrastructure.yml
• roles/app/main.yml
• vars.yml (production and shared)

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A walk through Pitch Perfect

Terraform

• roles/app/files/main.tf
• roles/app/templates/vars.tfvars.j2

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Workspaces

Split up configuration & re-use them

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Workspaces

Naming Convention

${client}-${layer/service/team/role/purpose}-${environment}

e.g. simpleweb-app-staging

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Terraform Configuration Language

State & Backend

• Local file
• "Remote" PostgreSQL DB
• Many more...

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Terraform Configuration Language

(Input) Variables

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Terraform Configuration Language

Locals

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Terraform Configuration Language

Providers

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Terraform Configuration Language

Resources

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Terraform Configuration Language

Functions, expressions & logic

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Terraform Configuration Language

Not covered

• Modules
• Outputs
• Importing existing resources
• Data sources
• Lots of funky logic you can (and can’t [easily]) do to make your templates powerful/illegible
• Plenty more

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Also not covered

• Actually deploying code

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Problems/Warnings

Configuration drift

All in or else chaos - https://devcenter.heroku.com/articles/using-terraform-with-heroku#best-practices

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Problems/Warnings

Collaboration

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Problems/Warnings

Misc errors encountered

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Problems/Warnings

Issues with Ansible & Terraform together

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Problems/Warnings

Provider credentials

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Recommendations

• Try without Ansible first
• Maybe try with a local state file
• It's like AWS CloudFormation but...

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Documentation & Resources

Motivation

• https://www.terraform.io/intro/index.html
• https://blog.heroku.com/six-strategies-deploy-to-heroku

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Documentation & Resources

Best practices

• https://www.terraform.io/guides/core-workflow.html
• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/best-practices.html

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Documentation & Resources

Learning

• https://devcenter.heroku.com/articles/using-terraform-with-heroku
• https://www.terraform.io/docs/index.html
• https://learn.hashicorp.com/terraform/
• https://www.terraform.io/docs/configuration/index.html
• https://www.terraform.io/docs/providers/heroku/