Learn how to build projects using Terraform.

DevOps for Developers

In this module, you will work from the ground up, starting with what Terraform is and the problems it solves. It will then guide you through the features of Terraform. You will build on your knowledge with the end goal of you being comfortable building projects using Terraform.

Terraform: From Beginner to Master with Examples in AWS

## Terraform local

A local is Terraform’s representation of a normal programming language variable. Confusingly,
Terraform also has a concept called a variable which is really an input (variables are covered in the [variables] chapter). A local can refer to a fixed value such as a string, or it can be used to refer to an expression such as two other locals concatenated together.

[variables]:
https://www.educative.io/courses/terraform-beginner-master-aws/variables



## Project example
Let's dive into an example:



provider "aws" {
    region = "us-east-2"
}

locals {
    first_part = "hello"
    second_part = "${local.first_part}-there"
    bucket_name = "${local.second_part}-how-are-you-today"
}

resource "aws_s3_bucket" "bucket" {
    bucket = local.bucket_name
}


### Project code in detail
In the code above:

* We define a local block by using the keyword `locals` and then an opening `{`.

* We define each local on a new line by giving it a name. The first local we define is called
`first_part`. 

* We then follow it with an `=` and give it a value. For the `first_part` local, we
give it the value of the string literal `hello`. 

* For the second local `second_part`, we are use the value `"${local.first_part}-there"`. 

* As the whole expression is inside quotes, we need to use
the `${` and `}` around our expression so Terraform evaluates it. 

* To reference a local, we use the
expression syntax `local.local_identifier`. 

* The `second_part` local will be set to `“hello-there”`.
In the `bucket_name` local, we are using the `second_part` local in the expression `"${local.second_part}-how-are-you-today"` which will evaluate to `hello-there-how-are-you-today`.

# Terraform local

A local is Terraform’s representation of a normal programming language variable. Confusingly,
Terraform also has a concept called a variable which is really an input (variables are covered in the [variables] chapter). A local can refer to a fixed value such as a string, or it can be used to refer to an expression such as two other locals concatenated together.

[variables]:
https://www.educative.io/courses/terraform-beginner-master-aws/variables



# Project example
Let's dive into an example:

## Project code in detail
In the code above:

* We define a local block by using the keyword `locals` and then an opening `{`.

* We define each local on a new line by giving it a name. The first local we define is called
`first_part`. 

* We then follow it with an `=` and give it a value. For the `first_part` local, we
give it the value of the string literal `hello`. 

* For the second local `second_part`, we are use the value `"${local.first_part}-there"`. 

* As the whole expression is inside quotes, we need to use
the `${` and `}` around our expression so Terraform evaluates it. 

* To reference a local, we use the
expression syntax `local.local_identifier`. 

* The `second_part` local will be set to `“hello-there”`.
In the `bucket_name` local, we are using the `second_part` local in the expression `"${local.second_part}-how-are-you-today"` which will evaluate to `hello-there-how-are-you-today`.

## Project code in detail
In the code above:

* We define a local block by using the keyword `locals` and then an opening `{`.

* We define each local on a new line by giving it a name. The first local we define is called
`first_part`. 

* We then follow it with an `=` and give it a value. For the `first_part` local, we
give it the value of the string literal `hello`. 

* For the second local `second_part`, we are use the value `"＄{local.first_part}-there"`. 

* As the whole expression is inside quotes, we need to use
the `＄{` and `}` around our expression so Terraform evaluates it. 

* To reference a local, we use the
expression syntax `local.local_identifier`. 

* The `second_part` local will be set to `“hello-there”`.
In the `bucket_name` local, we are using the `second_part` local in the expression `"＄{local.second_part}-how-are-you-today"` which will evaluate to `hello-there-how-are-you-today`.

This lesson will cover Terraform local, how they work, and how to use them.

Locals in Detail

Terraform local

Project example

Project code in detail