Terraform variables: variables.tf

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

https://cloud.google.com/docs/terraform/best-practices-for-terraform#variables

string
number
bool

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"
}

Variable usage

Usage in any terraform file (main.tf), using var. prefix:

AnyFieldToAssingAValue = var.YourVarName
AnyFieldToAssingAValue = "{var.YourVarName}-yourtext-here}"

yourvar = "${aws_lb.your_lb_resource_name.dns_name}"

Errors

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

Related term

• main.tf
• variable.tfvars
• terraform.tfvars
• terraform apply -var 'myvar=football'
• terraform plan
• local.
• module.
• data.
• .name
• .dns_name
• Terraform best practices

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 variables, types, env variables, variables.tf, .tfvars, nullable, validation, terraform.tfvars