Terraform variables

TOMERGE: Terraform variables: variables.tf

• https://www.terraform.io/language/values/variables: string, number, bool, any
• Terraform Cloud: https://www.terraform.io/cloud-docs/workspaces/variables

• Terraform variable definition: variables.tf

Examples

Using command line parameters:

• terraform apply -var="image_id=ami-abc123"
• terraform apply -var="image_id=ami-abc123 -var="your_second_var=yourvalue"

Using a file:

• terraform apply -var-file="your_file.tfvars"

Errors

• Error: Reference to undeclared input variable
• Error: Variables not allowed
• Error: Duplicate variable declaration
• Error: No value for required variable

Related

• Terraform variable types: string, number, bool, any
• Terraform environment variables
• Terraform configuration variables
• Terraform: variables.tf
• auto.tfvars
• nullable Terraform v1.1.0 (Dec 2021)
• validation block introduced in terraform CLI v0.13.0 (August 2020)
• output
• -var-file
• locals: locals.tf: https://www.terraform.io/language/values/locals
• Terragrunt: inputs:
• TF_VAR_

See also

• var., local., module., data., path., variables.tf
• Terraform variables, types, env variables, variables.tf, .tfvars, nullable, validation, terraform.tfvars
• Terraform types: string, number, bool, list/tuple, map/object, type constraints