Terraform variables: variables.tf

• https://www.terraform.io/docs/language/values/variables.html
• https://learn.hashicorp.com/tutorials/terraform/aws-variables

Example variable declaration

Definition in variables.tf

variable "YourVarName" {}
variable "YourVarName" { default = "your_default_value" }
variable "your_subnets" { default = ["subnet-0d68d399b6cf9c2b3", "subnet-055f2f0b4de211111"] }

variable "YourVarName" {
  default = "your_default_value"
}

variable "YourVarName" {
  type = string
  description = "Description of your variable"
  default = "your_default_value"
}

Usage in main.tf:

AnyFieldToAssingAValue = var.YourVarName

Errors

• Error: No value for required variable
• Error: Reference to undeclared input variable

Related term

• main.tf
• variable.tfvars
• Variables
• terraform apply -var ‘myvar=football’

See also

• Terraform configuration files, Terraform state files: .tf, .tfvars, main.tf, outputs.tf, variables.tf, .terraform.d/, terraform init, providers.tf, .terraform/, terraform.tfstate, .terraform.lock.hcl, terraform.tfstate.d, override.tf, versions.tf
• terraform [untaint | fmt | apply |show | state | init | plan | console | output | validate | destroy | debug | import | providers | get | graph | workspaces | resource | login | -var-file | state mv | state pull | state push | state replace-provider | state rm | force-unlock | env | tfe | --version | remote-exec | delete on termination | deprecated commands | terraform --help]
• Terraform, OpenTofu, Terrakube.org, Installation, Terraform AWS, Terraform GCP, Terraform commands, Terraform Cloud, Terraform Enterprise (TFE), HCL, HIL, meta-arguments, providers, modules, resource, provisioners, data sources, backends: remote backends, examples, configuration files, state files, variables, types, Terraform Registry, conditionals: depends_on, functions, Blocks, dynamic blocks, errors, Terragrunt, Terraformer, Terratest, Terraform certifications, Terraform map type, Terraform Associate, Terraform: list type, TF_VAR_, TF_LOG, Terraform provider versioning, Terraform Style Conventions, Required version, Terraform plugin, Terraform Named Values, tags, Changelog, tfsec, tflint, Operators, Expressions: for, splat, Debugging, Namespaces, Terraform Landing Zones, CDKTF, Atmos