11-loops-example

Terraform Loops example

This folder contains the loops example of a Terraform file on AWS (Amazon Web Services).

It shows how do loops in Terraform.

This Terraform file create 3 IAM users, create an IAM policy and attach the IAM policy to the IAM users.

We use the meta-parameter "count" and two interpolation functions:

• "${element(LIST, INDEX)}"
• "${length(LIST)}"

Requirements

• You must have Terraform installed on your computer.
• You must have an AWS (Amazon Web Services) account.
• It uses the Terraform AWS Provider that interacts with the many resources supported by AWS through its APIs.
• This code was written for Terraform 0.10.x.

Using the code

• Configure your AWS access keys.

  Important: For security, it is strongly recommend that you use IAM users instead of the root account for AWS access.

  Setting your credentials for use by Terraform can be done in a number of ways, but here are the recommended approaches:

  • The default credentials file

    Set credentials in the AWS credentials profile file on your local system, located at:

    ~/.aws/credentials on Linux, macOS, or Unix

    C:\Users\USERNAME\.aws\credentials on Windows

    This file should contain lines in the following format:

    [default]
    aws_access_key_id = <your_access_key_id>
    aws_secret_access_key = <your_secret_access_key>

    Substitute your own AWS credentials values for the values <your_access_key_id> and <your_secret_access_key>.

  • Environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY

    Set the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.

    To set these variables on Linux, macOS, or Unix, use export:

    export AWS_ACCESS_KEY_ID=<your_access_key_id>
    export AWS_SECRET_ACCESS_KEY=<your_secret_access_key>

    To set these variables on Windows, use set:

    set AWS_ACCESS_KEY_ID=<your_access_key_id>
    set AWS_SECRET_ACCESS_KEY=<your_secret_access_key>

• Initialize working directory.

  The first command that should be run after writing a new Terraform configuration is the terraform init command in order to initialize a working directory containing Terraform configuration files. It is safe to run this command multiple times.

  terraform init

• Validate the changes:

  terraform plan

• Deploy the changes:

  terraform apply

• Test the deployment.

  You should see 3 IAM users, an IAM policy and the IAM policy attached to the IAM users.

• Clean up the resources created when you have finished:

  terraform destroy