How do you use a variable inside a variable in terraform?

Terraform does not support variables inside a variable. If you want to generate a value based on two or more variables then you can try Terraform locals (https://www.terraform.io/docs/configuration/locals.html). Locals should help you here to achieve goal.

How do you use variables in terraform modules?

variables.tf will contain the variable definitions for your module. When your module is used by others, the variables will be configured as arguments in the module block. Since all Terraform values must be defined, any variables that are not given a default value will become required arguments.

How do you access local variables in terraform?

Using a variable A variable’s value can be accessed from within the terraform module block by using var. . Below we have an example demonstrating this. The variable’s value can only be accessed in an expression within the modules where it was declared.

How do you pass a variable in terraform?

Using the -var Command-line Flag The -var flag is used to pass values for Input Variables to Terraform commands. This flag can be used with both of the Terraform plan and apply commands. The argument passed to the -var flag is a string surrounded by either single or double quotes.

What is the input variable called?

independent variable
A symbol that stands for an arbitrary input is called an independent variable, while a symbol that stands for an arbitrary output is called a dependent variable. The most common symbol for the input is x, and the most common symbol for the output is y; the function itself is commonly written y = f(x).

What are output variables?

Output variables store the results of a module operation. The usage of output variables is even more common: the set variable receives the result that is extracted from the module (measured by a device, calculated in MatShell, set by a user in an Instruction, etc).

How do you pass a variable in Terraform command line?

When variables are declared in the root module of your configuration, they can be set in a number of ways:

In a Terraform Cloud workspace.
Individually, with the -var command line option.
In variable definitions ( . tfvars ) files, either specified on the command line or automatically loaded.
As environment variables.

What is local variable in Terraform?

Terraform locals are named values that you can refer to in your configuration. You can use locals to give a name to the result of any Terraform expression, and re-use that name throughout your configuration. Unlike input variables, locals are not set directly by users of your configuration.

How do I create a variable file in TerraForm?

All files in your Terraform directory using the .tf file format will be automatically loaded during operations. Create a variables file, for example, variables.tf and open the file for edit. Add the below variable declarations to the variables file. Replace the SSH key private file path and the public key with our own.

Is there way to mimic nested variable in TerraForm?

You just wish they could allow a tiny more. Most of the time, the code inside your terraform configuration is pretty static, more like a reflection of the actual end state (hard coded).

What does the condition argument in TerraForm mean?

The condition argument is an expression that must use the value of the variable to return true if the value is valid, or false if it is invalid. The expression can refer only to the variable that the condition applies to, and must not produce errors.

Can a variable be called on demand in TerraForm?

Alternatively, output variables can also be called on-demand using terraform output command. Next, continue on to set up a variable file for server configuration. You should have a Terraform project with a basic plan already set up. If not, follow our getting started guide for Terraform to begin.

How do you use a variable inside a variable in terraform?