https://wiki.kamaradski.com/ 2026-04-04T11:45:25+00:00 https://wiki.kamaradski.com/ https://wiki.kamaradski.com/lib/exe/fetch.php?media=wiki:logo.png text/html 2024-07-01T10:34:43+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:conditionalexpressionswithvariables&rev=1719830083&do=diff Conditional Expressions with Variables Terraform supports conditional expressions that can be used to assign variable values based on conditions. variable "environment" { description = "Deployment environment" type = string } resource "aws_instance" "example" { ami = "ami-0c55b159cbfafe1f0" instance_type = var.environment == "production" ? "t2.large" : "t2.micro" } text/html 2024-07-01T10:34:11+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:defaultvalues&rev=1719830051&do=diff Default Values Variables can have default values, which are used if no other value is provided. variable "region" { description = "AWS region" type = string default = "us-west-2" } text/html 2024-07-01T09:57:05+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:inputvariables&rev=1719827825&do=diff Defining Input Variables Input variables are defined using the variable block. Each variable can have a default value, a type, a description, and other optional parameters. variable "instance_type" { description = "Type of EC2 instance" type = string default = "t2.micro" } text/html 2024-10-21T14:37:32+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:list&rev=1729521452&do=diff Lists In Terraform, lists are one of the fundamental data types used to store an ordered collection of values. They are particularly useful when you need to manage multiple items of the same type, such as a list of IP addresses, server names, or AWS availability zones. text/html 2024-07-01T10:08:59+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:outputvariables&rev=1719828539&do=diff Output Variables Output variables are used to return values from a Terraform configuration. They are useful for passing information to other configurations or tools. output "instance_id" { description = "The ID of the EC2 instance" value = aws_instance.example.id } output "instance_public_ip" { description = "The public IP address of the EC2 instance" value = aws_instance.example.public_ip } text/html 2024-07-01T10:32:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:providingvaluesforvariables&rev=1719829961&do=diff Providing Values for Variables Values for variables can be provided in several ways: Command-line Flags Use the -var option with terraform apply or terraform plan. terraform apply -var="instance_type=t2.large" Variable Definition Files Define variables in a .tfvars file or .tfvars.json file. text/html 2024-07-01T10:33:40+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:sensitivevariables&rev=1719830020&do=diff Sensitive Variables Sensitive variables are used to store sensitive information like passwords. When marked as sensitive, these variables will not be displayed in the console output. variable "db_password" { description = "The password for the database" type = string sensitive = true } text/html 2024-07-01T10:42:21+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:tuple&rev=1719830541&do=diff Tuples In Terraform, a tuple is a sequence of values, identified by their order. Tuples are similar to lists, but they are intended to represent a fixed collection of elements where each element can have a different type. Defining Tuples Tuples can be defined using square brackets [] with elements separated by commas. Each element in the tuple can be of a different type. text/html 2024-07-01T10:31:26+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:usingvariablesinconfiguration&rev=1719829886&do=diff Using Variables in Configuration Variables can be accessed using the var keyword. resource "aws_instance" "example" { ami = "ami-0c55b159cbfafe1f0" instance_type = var.instance_type tags = var.instance_tags } text/html 2024-07-01T10:30:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:variabletypeconstraints&rev=1719829857&do=diff Variable Type Constraints You can specify the type of a variable to enforce that the provided value matches the expected type. variable "vpc_cidr_block" { description = "CIDR block for the VPC" type = string } variable "availability_zones" { description = "List of availability zones" type = list(string) } variable "instance_tags" { description = "Map of tags to assign to the instance" type = map(string) } text/html 2024-07-01T10:33:06+00:00 Anonymous (anonymous@undisclosed.example.com) https://wiki.kamaradski.com/doku.php?id=terraform:variablevalidation&rev=1719829986&do=diff Variable Validation You can add validation rules to ensure that input values meet certain criteria. variable "instance_type" { description = "Type of EC2 instance" type = string default = "t2.micro" validation { condition = contains(["t2.micro", "t2.small", "t2.medium"], var.instance_type) error_message = "Instance type must be one of t2.micro, t2.small, or t2.medium." } }