Taming Terraform Workflow Using Terraform Modules and Github

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Senior Developer - Production Operations and Delivery @anubhavm Taming Terraform Workflow Anubhav Mishra Using Terraform Modules and Github Lead Developer - Production Operations and Delivery @lkysow Luke Kysow

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Talk ● Terraform at Hootsuite ● Use of Terraform Modules (Dev <--> Ops) ● Atlantis - Hootsuite’s Terraform Workflow ● Live Demo

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Terraform at Hootsuite

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Numbers ● 100+ developers ● 20+ microservices ● 2 cluster schedulers ● 1000+ servers ● 1000s of AWS resources

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Timeline ● Mid 2015 - First Terraform Repo (v1) ● Starting 2016 - Terraform (v2) ● End of 2016 - Terraform “Advanced” Workflow

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Before Terraform

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What is Terraform? ● Terraform allows you to manage, build and visualize your infrastructure as code

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First Attempt

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First Attempt

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First Attempt

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First Attempt staging != production

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Terraform State

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First Attempt

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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Terraform Version 2 (Second Attempt) terraform.tfstate { "version": 3, "terraform_version": "0.8.8", "serial": 175, "lineage": "2cb11085-2e4e-40ff-bf81-e4ddf8bc8d5d", "modules": [ { "path": [ "root" ], "outputs": {}, "resources": { ....

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Terraform Version 2 (Second Attempt) terraform.tfstate

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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terraform.tfstate { "version": 3, "terraform_version": "0.8.8", "serial": 1, "lineage": "9e42c0ac-9e73-4910-8859-504934f2b499", "backend": { "type": "s3", "config": { "bucket": "terraform", "key": "foo-bar", "region": "us-east-1" }, .... "outputs": {}, "resources": { "null_resource.hello": { "type": "null_resource", "depends_on": [], "primary": { "id": "792399369485920658", "attributes": { "id": "792399369485920658" }, "meta": {}, ....

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stash

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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Problems with our first attempt ● Environment drift ● One massive state for every environment ● Hard to collaborate on infrastructure

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module.server Let me make a generic server module I need 2 servers. Now! Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Inputs Output

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt)

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Terraform Version 2 (Second Attempt) 139 Repositories

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● Multi Environment Terraform Projects ● Isolated Terraform States for Services ○ Smaller Failure Domain ○ Rapid Iteration on Infrastructure ● Use of Terraform Modules ○ Environment Parity ○ Increased Collaboration Between Ops and Dev

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Are we all done?

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How do we continue to move fast while we add people?

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atlantis A unified workflow for collaborating on Terraform through GitHub. https://github.com/hootsuite/atlantis

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Demo

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● atlantis - https://github.com/hootsuite/atlantis ● slide deck - https://speakerdeck.com/anubhavmishra/taming-terraform-work flow-using-terraform-modules-and-github ● hashicorp-atlantis-demo - https://github.com/lkysow/hashicorp-meetup-atlantis-demo Links

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Thank You! $ terraform plan -var-file=we-are-hiring.tfvars $ terraform apply hootsuite.com/careers ● Atlantis Github: https://github.com/hootsuite/atlantis