Terraform at Adobe KelvinJasperson

Introduc)on

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Systems Engineer @ Adobe Audience Manager (AAM) Been with Adobe for 18 months AAM was acquired by Adobe in 2011, and is 100% in AWS Twitter- @zxjinn

HashiCorp

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Raise your hands

• WhoknowswhatTerraformis?• WhousesTerraform?• …inproduc=on?

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Terraform

•  Infrastructureascode•  Supportsmanyproviders

•  AWS•  Azure•  DigitalOcean•  GoogleCloud•  Heroku•  OpenStack•  VMwarevSphere/vCloudDirector•  others…

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Why Terraform?

•  Funtowrite•  Easytoextendwithmodules•  Showstheexecu=onplan(no-op)•  StatestoredinacommiTablefile

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Basic Terraform Example

Basic Terraform Example

$ cat main.tfresource "aws_instance" "app" { ami = "ami-d1f482b1" count = 5 instance_type = "t2.micro"}$ terraform plan+ aws_instance.app.0...+ aws_instance.app.1...$ terraform applyaws_instance.app.0: Creating...Apply complete! Resources: 5 added, 0 changed, 0 destroyed.$

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It worked! Parallel, takes ~1 min

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Basic Terraform Destroy $ terraform destroyDo you really want to destroy? Terraform will delete all your managed infrastructure. There is no undo. Only 'yes' will be accepted to confirm. Enter a value:

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yes

aws_instance.app.0: Destroying...Apply complete! Resources: 0 added, 0 changed, 5 destroyed.$

It worked! Parallel, takes ~1 min

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More than just EC2 instances

•  S3-SimpleStorageService• CloudForma=on• VPC-VirtualPrivateCloud•  SQS-SimpleQueueService• Route53-HostedDNS• RDS-Rela=onalDatabaseService•  IAM-Iden=tyandAccessManagement•  ECS-EC2ContainerService• others…

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Modules, Compositions, and Clusters

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Modules

•  Self-containedreusablecode• Behaviorchangesbasedoninputs•  Terraformcode

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Clusters

Composi=ons

Modules • Founda=on

Composi)ons

• Pre-definedcollec=onsofmodules• Passesparameterstomanymodules•  Terraform+Jinja

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Clusters

Composi=ons •  Frame

Modules • Founda=on

Clusters

• Passesparamstoonecomposi=on• Ul=matesourceoftruth•  YAML

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Clusters •  Blueprint

Composi=ons •  Frame

Modules • Founda=on

For example

• Module•  VPCmodule-NATandBas=oninstances,securitygroups,etc•  App1module-App1Instances,SQSqueues,S3buckets,subnets•  DB1module-RDSinstances,securitygroups•  Adminmodule-Instances-configmanagement,monitoring,etc

• Composi=on•  Edgecomposi=on-VPC,App1,DB1,Admin•  DataProcessingcomposi=on-VPC,App2,DB2,Admin•  Deliverycomposi=on-VPC,App3,Admin

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Analogous to modern Puppet design

•  TerraformModules=PuppetModules• Composi=ons=RolesandProfiles• Clusters=ENCandHiera

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Ops wrapper

• ReadsclusterYAMLvariables• Readscomposi=on(.l.jijna2),writesTerraform(.l)fileswithclustervariablesinjected

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Demo!

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The Future

•  JenkinsrunsTerraformandcommitsstatefile• WebinterfacetogenerateclusterYAMLfilesforselfservice• Pendingdiscussion:opswrappergeneratesTerraformJSONinsteadofparsingjinja

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Lessons Learned, Best Prac)ces

• AspringboardforTerraform(opswrapperforus)isinvaluable•  TerraformHCL+JinjatemplatesareeasiertowriteandreadthanTerraformJSON

• Make1cluster=1vpc=1environment=1purpose•  Reproducibleenvironments•  SeparatedTerraformstatefilespercluster

• Versionuserdatainamapvariable•  SymlinksharedTerraformfilesinmodules•  Separate“common”infrastructurelike-S3buckets,SQS,IAMtoitsowncluster

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Don’t

• Getimpa=entwithTerraform• Goingunsblazinganduseitinproduc=ononday1•  SkipreadingtheTerraformdocs

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Woohoooo!

•  85%ofourproduc=oninfrastructureismanagedwithTerraform!

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Ques)ons?

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