Cheat-Sheets

Terraform

Commands

Command	What it does
Terraform init	initialize a working directory, dl the necessary provider plugins and modules, set up backend for storing infra state
Terraform plan	create a plan = a set of changes to make the resources match the config => preview the changes Terraform will make to match your configuration
Terraform apply	apply the planned changes (shows the delta then asks for confirmation)
Terraform fmt	format code (linting)
Terraform validate	validate the syntax of the configuration and correct usage of attributes and values
Terraform show	inspect the current state (see actual values associated with the resource group)
Terraform state	review the information in the state file (terraform.tfstate)
Terraform state list	see a list of the resources created with Terraform (terraform.tfstate)

Project structure and vocab

• Provider = plugin that Terraform uses to create and manage resources (ex: azurerm)
• Resource = component of the infrastructure -> has a type and a name

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• Variables.ts -> store redundant values/avoid hard-coding in templates
• Outputs.ts -> choose which data are output when applying changes (can also be queried with terraform output) -> avoids useless outputs when much info in a configuration

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Assign values to root module variables:

• .tfvars (terraform apply -var-file=”xxx.tfvars”)
• command line - -var=”name=value” on terraform plan/apply
• environment variables

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Backend = where terraform stores its state -> .tfbackend = ref to the place where it’s stored if remote