In this example, the security_groups variable is defined with a type of list(string), and it is given a default value of ["default"]. The AWS provider is then configured to use the us-west-2 region.

The aws_instance resource is used to launch Amazon EC2 instances. The vpc_security_group_ids argument is used to specify the security groups for the instance, and it is set to the value of the security_groups variable.

You can change the value of security_groups by modifying the default value in the variable definition, or you can specify a different value when you run Terraform by using the -var flag. For example, if you want to launch an instance with security groups ["default", "web-security-group"], you can run the following command:

	variable "security_groups" {
	type = list(string)
	default = ["default"]
	}
	provider "aws" {
	region = "us-west-2"
	}
	resource "aws_instance" "example" {
	ami = "ami-0c55b159cbfafe1f0"
	instance_type = "t2.micro"
	vpc_security_group_ids = var.security_groups
	}

view raw main.tf hosted with by GitHub

$ terraform apply -var ‘security_groups=[“default”, “web-security-group”]’

	#Filename - terraform-variable-type-list.tf
	provider "aws" {
	region = "ap-south-1"
	access_key = ""
	secret_key = ""
	}
	provider "github" {
	token = ""
	organization = ""
	}
	variable "users" {
	type = "list"
	default = ["devopsschool11", "devopsschool2", "devopsschool3"]
	description = "This is for demo of list variable"
	}
	variable "gitrepos" {
	type = "list"
	default = ["devopsschool11", "devopsschool2", "devopsschool3"]
	description = "This is for demo of list variable"
	}
	resource "aws_iam_user" "iamuser" {
	name = "${var.users[0]}"
	}
	resource "github_repository" "repo1" {
	name = "${var.gitrepos[0]}"
	description = "My awesome codebase"
	private = false
	}
	resource "github_repository" "repo2" {
	name = "${var.gitrepos[1]}"
	description = "My awesome codebase"
	private = false
	}
	resource "github_repository" "repo3" {
	name = "${var.gitrepos[2]}"
	description = "My awesome codebase"
	private = false
	}

view raw terraform-variable-type-list.tf hosted with by GitHub

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Terraform Basic Tutorial with Demo by Piyush 2020

Terraform Fundamental Tutorials by Harish in 2020

Terraform Fundamental Tutorial By Guru in 2020 Part-1

Terraform Fundamental Tutorial By Guru in 2020 Part-2

Terraform Fundamental Tutorial By Guru in 2020 Part-3

Terraform Fundamental Tutorial By Guru in 2020 Part-4

Terraform Fundamental Tutorial By Guru in 2020 Part-5

Terraform Advance Tutorial for Beginners with Demo 2020 — By DevOpsSchool

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Rajesh Kumar

I’m a DevOps/SRE/DevSecOps/Cloud Expert passionate about sharing knowledge and experiences. I am working at Cotocus. I blog tech insights at DevOps School, travel stories at Holiday Landmark, stock market tips at Stocks Mantra, health and fitness guidance at My Medic Plus, product reviews at I reviewed , and SEO strategies at Wizbrand. 

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