HCL

<BLOCK TYPE> "<BLOCK LABEL>" "<BLOCK LABEL>" {
  # Block body
  <IDENTIFIER> = <EXPRESSION> # Argument
}

Blocks

• terraform: settings block
• provider: providers config
• resource: resources to be created
• variable: define variables
• output: output information to somewhere
• data: allow data to be fetched or computed

Variables

• Variables are defined in variable block
• Default values are defined in the variable block, but they can be overwritten at runtime

# from literal
terraform plan -var "location=eastus"
terraform apply -var "location=eastus"

# from var file
terraform plan -var-file "terraform.tfvars"
terraform apply -var-file "terraform.tfvars"

• terraform.tfvars and *.auto.tfvars files are automatically populated
• Environment variables in the form TF_VAR_myvar are also automatically populated

location = "westus"
resource_group_name = "my-rg"